CN209858779U - Miniaturized wavelength-division multiplexing light receiving assembly - Google Patents
Miniaturized wavelength-division multiplexing light receiving assembly Download PDFInfo
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- CN209858779U CN209858779U CN201920934043.5U CN201920934043U CN209858779U CN 209858779 U CN209858779 U CN 209858779U CN 201920934043 U CN201920934043 U CN 201920934043U CN 209858779 U CN209858779 U CN 209858779U
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Abstract
The utility model discloses a miniaturized wavelength-division multiplexing light receiving component, which comprises an optical fiber collimator for inputting signal light; the wavelength division demultiplexing subassembly is used for demultiplexing the signal light input by the optical fiber collimator into a plurality of beams of collimated light; the right-angle prism has one right-angle surface opposite to the output end of the wavelength division demultiplexing subassembly and is used for receiving a plurality of beams of collimated light which are demultiplexed by the wavelength division demultiplexing subassembly, and then the beams of collimated light are output from the other right-angle surface of the right-angle prism after being reflected by the inclined surface of the right-angle prism; the lens array is arranged on two right-angle surfaces of the right-angle prism or one of the right-angle surfaces; the optical substrate is used for relatively and fixedly mounting the optical fiber collimator, the wavelength division multiplexing subassembly and the right-angle prism; the utility model discloses have the wavelength and show the advantage along with temperature coefficient of variation is little, high pass band width, low insertion loss, low crosstalk etc. satisfy industry level requirement standard in the trade completely, especially satisfy 5G fronthaul application scene and to the harsh requirement of optical device industrial grade environmental condition.
Description
Technical Field
The utility model belongs to the technical field of optical communication technique and device and specifically relates to a miniaturized wavelength division multiplexing light receiving assembly.
Background
Wavelength Division Multiplexing (WDM) is a technology in which optical carrier signals (carrying various information) with two or more different wavelengths are combined together at a transmitting end via a Multiplexer (also called a Multiplexer, MUX for short) and coupled to the same optical fiber of an optical line for transmission; at the receiving end, the optical carriers of various wavelengths are separated by a Demultiplexer (also called a Demultiplexer, DEMUX for short) and then further processed by an optical receiver to recover the original signal. This technique of simultaneously transmitting two or more optical signals of different wavelengths in the same optical fiber is called wavelength division multiplexing. The wavelength division multiplexing technology can realize the transmission of a single optical fiber to a plurality of wavelength signals, which can improve the transmission capacity of the optical fiber by times, and is widely applied to the medium and long distance transmission of optical communication and the interconnection of data centers.
In the optical Transceiver (Transceiver), in order to implement wavelength division Multiplexing (MUX) and Demultiplexing (DEMUX), the most core optical devices are MUX and DEMUX optical components, where Z-BLOCK and AWG (arrayed waveguide grating) are the two most common and typical MUX/DEMUX subcomponents. Compared with AWG, Z-BLOCK has the advantages of low insertion loss, wide spectral bandwidth, low channel crosstalk, low temperature sensitivity, etc., and is widely applied in high-speed QSFP and OSFP optical transceivers such as 40G, 100G, and 400G, etc., in each optical transceiver, there is usually a pair of Z-BLOCKs for MUX and DEMUX, respectively, and its schematic diagram is shown in fig. 1.
A typical structure of the Z-BLOCK is shown in fig. 2, which includes a parallelogram glass plate polished on both front and back sides, the front side of the glass plate includes regions coated with antireflection film and high reflection film, and several regions on the back side are coated with a plurality of WDM (wavelength division multiplexing) filters with different wavelengths or are attached with a plurality of optical filters coated with WDM filters with different wavelengths, and the number of the filters or optical filters is usually 4 or 8. Collimated light beams with multiple wavelengths are emitted from an incident end according to a design angle, and light signals with different wavelengths are separated after being transmitted and reflected by a series of filter films, so that DEMUX is realized, and otherwise, MUX is realized.
The wavelength division demultiplexing optical receiving component has the main functions of collimating and demultiplexing multi-wavelength WDM light accessed by an optical fiber and then efficiently coupling the light into a PD. As a core device in an optical transceiver, taking a 4-channel wavelength division multiplexing optical receiving component as an example, the existing technical solution includes:
prior art scheme 1: and all the discrete components are assembled in sequence and independently to realize wavelength division demultiplexing. The discrete components comprise an optical fiber collimator, a WDM optical filter, a reflector, a coupling lens, a prism or a spectroscope, each component needs to be actively adjusted and aligned, the assembly efficiency is low, the cost is high, and miniaturization is difficult to achieve.
Prior art scheme 2: the method adopts Z-BLOCK as a DEMUX subassembly, adopts an optical fiber collimator at an incident end, adopts 4 optical fiber collimators to receive after the Z-BLOCK or adopts 4 independent lenses to couple, also needs active alignment adjustment, has low assembly efficiency and high cost, and cannot realize miniaturization.
Prior art scheme 3: the AWG is used as a DEMUX subassembly, the optical fiber head is assembled by directly coupling with the waveguide at the input end of the AWG, and the optical fiber head is directly coupled with the PD array through the output end of the AWG. Although the assembly method has the advantages of simplicity, high efficiency and low cost, the AWG of the prior art has certain gap compared with the performance of the Z-BLOCK, and can only be used in certain scenes with low requirements on performance and environment.
In recent years, with the rapid development and wide popularization of big data, cloud storage/service, internet of things, AR/VR and mobile internet terminal devices, the global demand for network bandwidth has been explosively increased, which not only greatly promotes the increased investment of each big internet huge head and communication operators in the aspect of data center construction, but also accelerates the arrival of the 5G era. As one of core devices in the field of optical communications, optical transceivers have been in a rapidly increasing market demand in recent years. Currently, 100G optical transceivers based on CWDM4 technology have become the mainstream of the market, and 400G optical transceivers based on CWDM4 and CWDM8 will become the next generation products in the coming years. The market demand for optical transceivers is rapidly rising, and meanwhile, the price and energy consumption are correspondingly reduced, and low cost, low energy consumption and small integration are the development directions of the optical transceivers. Especially in 5G fronthaul applications, optical transceivers are also required to meet industry-level standards to accommodate the harsh environmental requirements of the outdoor environment. As a core optical component in an optical transceiver, a wavelength division multiplexing optical receiver module is a development trend that, while meeting various standards in the industry, it is constant in the future to pursue low cost, small integration, and high performance at the same time.
Disclosure of Invention
To the situation of the prior art, the utility model aims to provide an easy assembly, low cost, high performance, can realize the automatic miniaturized wavelength-division multiplexing light receiving assembly of volume production.
In order to realize the technical purpose, the utility model discloses a technical scheme does:
a miniaturized wavelength division multiplexing optical receiving module, comprising:
a fiber collimator for inputting collimated signal light;
the wavelength division demultiplexing subassembly is used for demultiplexing the signal light input by the optical fiber collimator into a plurality of beams of collimated light;
the right-angle prism has one right-angle surface opposite to the output end of the wavelength division demultiplexing subassembly and is used for receiving a plurality of beams of collimated light which are demultiplexed by the wavelength division demultiplexing subassembly, and then the beams of collimated light are output from the other right-angle surface of the right-angle prism after being reflected by the inclined surface of the right-angle prism; a non-right-angle prism can be adopted for replacing the prism, so that the function of the right-angle prism is realized;
the lens array is arranged on two right-angle surfaces of the right-angle prism or one of the right-angle surfaces;
and the optical substrate is used for relatively fixedly mounting the optical fiber collimator, the wavelength division multiplexing subassembly and the right-angle prism.
Furthermore, the optical fiber collimator is also connected with an optical fiber ferrule assembly.
Preferably, the fiber stub assembly is an LC receptacle or an LC connector, but is not limited to these two.
The optical fiber collimator consists of an optical fiber head, a collimating lens and a sleeve; the optical fiber head can be a glass optical fiber head or a ceramic optical fiber head, the end face of the optical fiber head is ground and polished, in order to improve Return Loss (RL) index, the optical fiber head can be selectively processed into an angle of 4-9 degrees, and the end face can be selectively plated with an antireflection film; the collimating lens is a plano-convex glass lens, in order to improve RL index, the plane end can be selectively processed into an angle of 4-9 degrees so as to be matched with the angle of the optical fiber head, and the plane and the convex surface are both coated with antireflection films; the sleeve is a glass sleeve or a metal sleeve; the optical fiber head and the collimating lens are assembled in the same sleeve through glue to form the collimator.
Furthermore, the wavelength division demultiplexing component is a Z-Block, the output end of the component has a plurality of optical filters or optical filters with different working wavelengths, the component comprises a parallelogram glass flat plate with polished front and back surfaces, the front side of the glass flat plate respectively comprises regions coated with an antireflection film and a high reflection film, several regions on the back side are respectively coated with a plurality of (typically 4 or 8) WDM (wavelength division multiplexing) optical filters with different wavelengths or are adhered with a plurality of (typically 4 or 8) optical filters respectively coated with WDM optical filters with different wavelengths, and by designing the incident angle and the emergent pitch (pitch) of the Z-Block, the miniaturization of the Z-Block size can be realized, the incident angle range of the Z-Block is 3 degrees to 45 degrees, typically 8 degrees or 13.5 degrees, and the pitch range is 0.25mm to 2 mm.
Preferably, the lens array comprises a plurality of plano-convex lenses in one-to-one correspondence with the light filtering films or the light filtering sheets on the Z-Block, the plane sides of the plano-convex lenses are connected with the right-angle prism, the lens array comprises a plurality of (usually 4 or 8) plano-convex lenses with high-precision pitches (pitch), the materials are usually Si or fused quartz, the materials are usually realized by adopting a photoetching process or a die pressing process, the pitch range is from 0.25mm to 2mm, the convex surfaces of the lenses are plated with air antireflection films, and the planes are plated with glue antireflection films.
Preferably, an antireflection film is arranged on the connecting surface of the lens array and the right-angle prism.
Preferably, the Z-Block is a four-channel Z-Block or an 8-channel Z-Block.
Furthermore, the optical substrate is made of glass, silicon or ceramic materials.
Further, the right-angle prism is formed by a Si material or a glass material, the angle of the right-angle prism is designed according to the difference of the refractive indexes of the materials, a certain included angle is formed between emergent light and the normal of an emergent surface, the included angle ranges from 4 degrees to 10 degrees, the RL index of the system is favorably improved, one surface of the right-angle prism is attached to the plane of the lens array by glue, the glue can be heat curing glue or double curing glue (both ultraviolet curing and heat curing can be cured), the two right-angle surfaces of the right-angle prism are coated with an anti-reflection film or an uncoated film (the refractive index of the lens array is matched with the refractive index of the glue at the moment), the other surface is coated with an air anti-reflection film, and when the two right-angle surfaces are connected with the lens array, the anti-reflection films are arranged. In addition to the mutually attached structures, the right-angle prism and the lens array can be made into a whole by adopting an etching or mould pressing process, and air antireflection films are plated on the incident surface and the emergent surface respectively;
alternatively, the right-angle prism can be replaced by a non-right-angle prism, and all functions of the right-angle prism can be realized.
The optical substrate is an optical material, such as glass or silicon, or a ceramic material substrate, and a series of high-precision position alignment lines can be manufactured on the substrate according to design by methods such as laser marking or photoetching mask and the like;
the optical fiber collimator, the wavelength division demultiplexing subassembly and the right-angle prism attached with the lens array are respectively adjusted and aligned with the position alignment line on the substrate, after alignment is completed, the optical fiber collimator, the wavelength division demultiplexing subassembly and the right-angle prism are quickly and accurately fixed and assembled on the substrate through glue, and the glue can be ultraviolet curing glue or dual curing glue.
A method for assembling a miniaturized wavelength division multiplexing optical receiving module, comprising the steps of:
(1) marking a position point on the optical fiber collimator, at which the emergent light is completely parallel to the bottom surface of the sleeve, and an angle delta phi deviated by corresponding 90 degrees;
(2) processing the opposite line on the optical substrate by using a laser marking or photoetching mask process;
(3) attaching and fixing the wavelength division demultiplexer component and the right-angle prism attached with the lens array on the optical substrate according to the position of the alignment line;
(4) and rotating the optical fiber collimator by delta phi according to the calibrated position to compensate the angular deviation, and then attaching and fixing the optical fiber collimator and the optical substrate.
The utility model discloses the function that can realize is: the method comprises the steps that a multi-Wavelength Division Multiplexing (WDM) signal accessed from one end of an optical fiber ferrule assembly is collimated through an optical fiber collimator, the WDM collimated light enters a wavelength division demultiplexing subassembly and then is demultiplexed into a plurality of single-wavelength collimated lights with the same pitch, the single-wavelength collimated lights with the same pitch enter a lens array and a right-angle prism with corresponding high-precision pitches, the plurality of signal lights are focused on a receiving surface of a photodiode array (PD array) with the same pitch as the lens array through focusing of a lens and reflection of an inclined surface of the right-angle prism, and finally conversion of photoelectric signals is achieved.
Through foretell technical scheme, compared with the prior art, the utility model, its beneficial effect who has is:
the sub-parts of the utility model can be compact and miniaturized according to the assembly layout; through the parameters of the collimating lens, the lens array and the right-angle prism of the optimally designed optical fiber collimator, the material with the optimal refractive index is selected, the performance index of the receiving assembly can be greatly improved, the assembly difficulty of the assembly is reduced, and the key indexes of low insertion loss, low crosstalk, high return loss and the like are realized. Compare AWG wavelength division multiplexing receiving element under the prior art, the utility model discloses have wavelength along with temperature coefficient of variation little, high pass band width, low insertion loss, low performance advantage that is showing such as crosstalk, satisfy industry level requirement standard in the trade completely, especially can satisfy the harsh requirement of 5G fronthaul application scene to optical device industrial grade environmental condition.
The utility model discloses an assembly method can adopt and directly will divide piece and base plate to carry out the assembly method of passive alignment (passive alignment) to the bit line, compare the single chip light filter of prior art and the coupling method that single chip lens initiative (active) counterpoint was adjusted, the utility model discloses assembly method is simple, efficient, with low costs, can realize automatic assembly and mass production, can satisfy in data center and the following 5G optical transceiver right the utility model discloses the extensive commercial demand of subassembly.
Drawings
The scheme of the invention is further explained by combining the attached drawings and the detailed embodiment:
FIG. 1 is a typical Transceiver structure in the prior art, which includes a pair of independent MUX and DEMUX;
FIG. 2 is a diagram of a typical prior art Z-BLOCK structure;
fig. 3 is a schematic 3D structure diagram of embodiment 1 of the present invention;
fig. 4 is a schematic view of a top view structure and a light path of embodiment 1 of the present invention;
fig. 5 is a schematic side view of embodiment 1 of the present invention;
FIG. 6 is an enlarged view of a portion of the structure at A in FIG. 5;
fig. 7 is a schematic top view of a modified structure according to embodiment 1 of the present invention;
fig. 8 is a schematic side view of a modified structure of embodiment 1 of the present invention;
fig. 9 is a schematic top view of embodiment 2 of the present invention;
fig. 10 is a schematic side view of embodiment 2 of the present invention;
fig. 11 is a schematic plan view of a modified structure of embodiment 2 of the present invention;
fig. 12 is a schematic side view of a modified structure of embodiment 2 of the present invention;
fig. 13 is a schematic top view of embodiment 3 of the present invention;
fig. 14 is a schematic side view of embodiment 3 of the present invention;
FIG. 15 is an enlarged view of a portion of the structure at A in FIG. 14;
FIG. 16 is a schematic view of a convex sinking lens array in accordance with an embodiment of the present invention;
fig. 17 is a schematic top view of embodiment 4 of the present invention;
fig. 18 is a schematic side view of embodiment 4 of the present invention;
FIG. 19 is an enlarged view of a portion of the structure at A in FIG. 18;
fig. 20 is a schematic top view of embodiment 5 of the present invention;
fig. 21 is a schematic side view of embodiment 5 of the present invention;
fig. 22 is an enlarged view of a part of the structure at a in fig. 21.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention will be further described in detail with reference to the accompanying drawings and the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
As shown in one of fig. 3 to 6, the present invention provides a miniaturized wavelength division multiplexing optical receiver module, including:
an optical fiber collimator 1 for inputting collimated signal light;
the wavelength division demultiplexing subassembly 2 is used for demultiplexing the signal light input by the optical fiber collimator into a plurality of beams of collimated light;
a right-angle prism 3, one right-angle surface of which is opposite to the output end of the wavelength division demultiplexing subassembly and is used for receiving a plurality of beams of collimated light which are demultiplexed by the wavelength division demultiplexing subassembly, and then the beams of collimated light are output from the other right-angle surface of the right-angle prism after being reflected by the inclined surface of the right-angle prism;
the lens array 4 is arranged on a right-angle surface of the right-angle prism 3, and the right-angle surface is a right-angle surface opposite to the wavelength division demultiplexing sub-assembly 3;
and the optical substrate 5 is used for relatively fixedly mounting the optical fiber collimator 1, the wavelength division multiplexing subassembly 2 and the right-angle prism 3.
The optical fiber collimator 1 is also connected with an optical fiber ferrule assembly 6; preferably, the fiber stub assembly 6 is an LC receptacle or an LC connector, but is not limited to these two.
In addition, the optical fiber collimator consists of an optical fiber head, a collimating lens and a sleeve; the optical fiber head can be a glass optical fiber head or a ceramic optical fiber head, the end face of the optical fiber head is ground and polished, in order to improve Return Loss (RL) index, the optical fiber head can be selectively processed into an angle of 4-9 degrees, and the end face can be selectively plated with an antireflection film; the collimating lens is a plano-convex glass lens, in order to improve RL index, the plane end can be selectively processed into an angle of 4-9 degrees so as to be matched with the angle of the optical fiber head, and the plane and the convex surface are both coated with antireflection films; the sleeve is a glass sleeve or a metal sleeve; the optical fiber head and the collimating lens are assembled in the same sleeve through glue to form the collimator.
In this embodiment, the wavelength division demultiplexing component 2 is a 4-channel Z-Block, the output end of the component has a plurality of optical filters 21 or optical filters with different operating wavelengths, and the component includes a parallelogram glass plate polished on the front and back sides, the front side of the glass plate includes regions coated with an antireflection film and a high reflection film, the rear side of the glass plate includes regions coated with 4 WDM (wavelength division multiplexing) optical filters with different wavelengths or is pasted with 4 optical filters coated with WDM optical filters with different wavelengths, the miniaturization of the Z-Block size can be realized by designing the incident angle and the emergent pitch (pitch) of the Z-Block, the incident angle of the Z-Block is usually 8 degrees or 13.5 degrees, and the pitch range is from 0.25mm to 2 mm; preferably, the lens array 4 includes a plurality of plano-convex lenses corresponding to the filter films 21 or filters on the Z-Block one by one, and the plane sides of the plano-convex lenses are connected with the right-angle prism, the lens array includes 4 plano-convex lenses with high precision pitch (pitch), the material is usually Si or fused quartz, the pitch range is from 0.25mm to 2mm, the convex surfaces of the lenses are plated with air antireflection films, and the plane is plated with glue antireflection films; preferably, an antireflection film is arranged on the connecting surface of the lens array and the right-angle prism.
Furthermore, the optical substrate is a glass or silicon or ceramic material substrate, and a series of high-precision position alignment lines can be manufactured on the substrate according to design by a laser marking or photoetching mask method.
Further, the right-angle prism is formed by a Si material or a glass material, the angle of the right-angle prism is designed according to the difference of the refractive indexes of the materials, a certain included angle is formed between emergent light and the normal of an emergent surface, the included angle ranges from 4 degrees to 10 degrees, the RL index of the system is favorably improved, one surface of the right-angle prism is attached to the plane of the lens array by glue, the glue can be heat curing glue or double curing glue (both ultraviolet curing and heat curing can be cured), the two right-angle surfaces of the right-angle prism are provided with an anti-reflection film which is glued with the lens array, the other surface of the right-angle prism is provided with an anti-reflection film which is coated with an air anti-reflection film, and when the two right-angle surfaces are connected with the. Besides the mutually attached structures, the right-angle prism and the lens array can be made into a whole by adopting an etching or mould pressing process, and air antireflection films are plated on the incident surface and the emergent surface respectively.
In the embodiment, WDM optical signals with central wavelengths of 1271nm, 1291nm, 1311nm and 1331nm are accessed from a left standard fiber ferrule assembly 6 LC receive, and become collimated light beams after passing through the fiber collimator 1, and the designed beam waist diameter of the collimated light is usually between 150 micrometers and 300 micrometers; the collimated light beam enters the area of the Z-BLOCK coated with the AR film at an incidence angle of 13.5 degrees and enters the Z-BLOCK, after the Z-BLOCK, WDM signals with 4 wavelengths are demultiplexed into 4 beams of collimated light, and the pitch (pitch) between every two of the 4 beams of light is 750 microns; the method comprises the following steps that 4 beams of collimated light with the pitch of 750 micrometers enter a coupling lens array attached to the front of a right-angle prism, the pitch and tolerance of the lens array are 750+/-1 micrometers, the collimated light beams are changed into convergent light beams after passing through the lens array, then the convergent light beams are transmitted downwards after being totally reflected by an inclined plane of the prism, finally the convergent light beams are emitted out of the bottom surface of the prism, the included angle between emergent light and the normal line of the bottom surface of the prism is 6-10 degrees, the emergent light is focused on a focal plane of the lens array, a PD array with the pitch of 750+/-1 micrometer is usually placed on the focal plane, the focused light is efficiently coupled into an effective area.
In this embodiment, the optimal size of the focal spot beam waist of the focusing point can be theoretically obtained by designing the focal length difference between the collimating lens and the coupling lens of the optical fiber collimator 1. For example, the mode field diameter of the optical fiber is 8.6 microns, the focal length of the collimating lens is designed to be 1.2mm, and the focal length of the coupling lens array is 1mm, so that the theoretical design can meet the requirement that the diameter of the focal spot beam waist is 8.6/1.2=7.167 microns, which is much smaller than the diameter of the effective coupling area of the existing high-speed receiving PD array, which helps to reduce the assembly tolerance and sensitivity requirement. It should be noted that the beam waist of the focusing point cannot be too small, which may result in too large divergence angle of the light beam, and further result in the size of the focused light spot rapidly increasing with the distance between the front and the rear of the focal plane, which may greatly increase the coupling sensitivity of the system, and is not favorable for assembly.
In this embodiment, since the focusing lens array 4 has a very high-precision pitch (pitch), it is ensured that four parallel beams of light emitted from the Z-BLOCK and having a good parallelism therebetween are obtained, and after being focused by the lens array, the precision of the interval between the center points of the four light spots is very high. In general, the PD array at the receiving end has the same high-precision pitch, which ensures that the central points of the four focused light spots all enter the central area of the effective area range of the PD array.
In this embodiment, the length of the back focal length of the coupling lens array can be extended or shortened by selecting the refractive index of the prism material, so that the assembled structure is more reasonable. For example, when an Effective Focal Length (EFL) is uniform for the same coupling lens, the back focal length of the Si prism is longer than when a borosilicate glass prism having a refractive index of about 3.5 is used, for example. It can be understood that, under the condition that the distance from the lens array to the focusing plane is not changed, if the Si prism is adopted, the effective focal length of the corresponding coupling lens can be shorter; since the relationship between the change in position Δ d of the spot on the focal plane and the effective focal length f and the angular deviation θ is Δ d = f tan (θ), when θ is small, Δ d = f θ, a short effective focal length means that the change in displacement of the spot with angle is smaller, i.e., the lower the angular sensitivity, the lower the alignment requirement for the assembly.
The assembly method of the structure of the embodiment comprises the following steps:
a method for assembling a miniaturized wavelength division multiplexing optical receiving module, comprising the steps of:
(1) marking a position point on the optical fiber collimator, at which the emergent light is completely parallel to the bottom surface of the sleeve, and an angle delta phi deviated by corresponding 90 degrees;
(2) processing the opposite line on the optical substrate by using a laser marking or photoetching mask process;
(3) attaching and fixing the wavelength division demultiplexer component and the right-angle prism attached with the lens array on the optical substrate according to the position of the alignment line;
(4) and rotating the optical fiber collimator by delta phi according to the calibrated position to compensate the angular deviation, and then attaching and fixing the optical fiber collimator and the optical substrate.
The whole assembly process of the embodiment can be completed by adopting an automatic alignment and angle correction method, and the assembly efficiency is high and the cost is low.
In this embodiment, the optical fiber collimator 1, the Z-BLOCK (i.e. the wdm subassembly 2), the rectangular prism 3 attached with the lens array 4, and the optical substrate 5 have the overall size of length, width, and height not exceeding 11 × 3.7 × 1.95mm after being assembled, and the size is smaller than the assembly of the AWG wdm receiving component with the same pitch, and is a completely miniaturized component.
Referring to fig. 7 and 8, as a modified structure of this embodiment, the length of the optical substrate 5 is increased, the material of the optical substrate 5 is optical glass or Si material, and the light reflected by the right-angle prism 3 is incident and transmitted through the optical substrate 5, and then focused on a focal plane at a small distance from the substrate. The deformed structure can be applied to the direct coupling of optical signals into a grating coupler (grating coupler) and then into a waveguide, and the rest parts are the same as the structures shown in FIGS. 3-6.
Example 2
Referring to fig. 9 and 10, this embodiment is substantially the same as embodiment 1, and differs from embodiment 1 in that the 4-channel Z-BLOCK is changed to an 8-channel Z-BLOCK, which can implement wavelength division demultiplexing with a total of 8 wavelengths, such as 1271nm, 1291nm, 1311nm, 1331nm, 1351nn, 1371nm, 1391nm and 1411nm, and the corresponding 4-channel lens array is also changed to an 8-channel lens array. The structure meets the requirements of the OSFP optical transceiver of 400G on a high-performance and miniaturized wavelength division demultiplexing receiving assembly, and other components are the same as the structures shown in the figures 3-6.
Referring to fig. 11 and 12, as a modified structure of this embodiment, the length of the optical substrate 5 is increased, the material of the optical substrate 5 is optical glass or Si material, and the light reflected by the right-angle prism 3 is incident and transmitted through the optical substrate 5, and then is focused on a focal plane at a slight distance from the substrate. This variant can be applied to the direct coupling of an optical signal into a grating coupler (grating coupler) and then into a waveguide.
The installation implementation of this embodiment is the same as that of embodiment 1, and is not described herein again.
Example 3
Referring to fig. 13 to 15, this embodiment is substantially the same as embodiment 1, and the only difference in this embodiment from embodiment 1 is that the lens array 4 is attached to the exit surface of the rectangular prism 3, and in this case, the lens array 4 with a shorter focal length can be selected to obtain a smaller size of light spot on the focal plane, and this structure can be satisfied with an application where the PD receiving area is small. At this time, the position of the focal plane of the focused spot can be ensured to coincide with the position of the PD receiving surface by strictly controlling the thickness of the optical substrate.
In order to achieve a smaller phase difference, when a Lens Array is selected, a convex sinking Lens Array (rececess Lens Array) as shown in fig. 16 may be employed. The convex step can be attached to the exit surface of the prism.
The installation implementation of this embodiment is the same as that of embodiment 1, and is not described herein again.
Example 4
Referring to fig. 17 to 19, this embodiment is substantially the same as embodiment 3, and differs from embodiment 3 in that 4-channel Z-BLOCK is changed to 8-channel Z-BLOCK, and the corresponding 4-channel lens array is also changed to 8-channel.
In order to achieve a smaller phase difference, when a Lens Array is selected, the present embodiment may also employ a convex sinking Lens Array (rececess Lens Array) shown in fig. 16. The convex step can be attached to the exit surface of the prism.
The installation implementation of this embodiment is the same as that of embodiment 1, and is not described herein again.
Example 5
Referring to fig. 20 to 22, this embodiment is a combination of embodiments 2 and 4, and lens arrays 4 (a lens array (on the incident surface) to which a long focal length is added and a lens array (on the exit surface) to which a short focal length is added) are provided on the front and rear surfaces of a rectangular prism 3, respectively. The collimated light beam can be converged and reduced by a long focal length lens array (commonly called a weak lens array), and then the converged light beam reflected by the inclined surface of the right-angle prism 3 enters the short focal length lens array and is finally focused on a focal plane.
The embodiment can focus the light spot to be very small, and the sensitivity of the change of the size of the light spot along with the front position and the rear position of a focal plane is very low after the light beam is converged, so that the embodiment is relatively suitable for the wavelength division multiplexing optical receiving component of the OSFP.
In order to achieve a smaller phase difference, when a Lens Array is selected, the present embodiment may also employ a convex sinking Lens Array (rececess Lens Array). The convex step can be attached to the exit surface of the prism.
The installation implementation of this embodiment is the same as that of embodiment 1, and is not described herein again.
It should be noted that the reference numerals of the components shown in fig. 3 to 22 are the same names and the components are identified by the same reference numerals.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A miniaturized wavelength division multiplexing optical receiving module, characterized in that: it includes:
a fiber collimator for inputting collimated signal light;
the wavelength division demultiplexing subassembly is used for demultiplexing the signal light input by the optical fiber collimator into a plurality of beams of collimated light;
the right-angle prism has one right-angle surface opposite to the output end of the wavelength division demultiplexing subassembly and is used for receiving a plurality of beams of collimated light which are demultiplexed by the wavelength division demultiplexing subassembly, and then the beams of collimated light are output from the other right-angle surface of the right-angle prism after being reflected by the inclined surface of the right-angle prism;
the lens array is arranged on two right-angle surfaces of the right-angle prism or one of the right-angle surfaces;
and the optical substrate is used for relatively fixedly mounting the optical fiber collimator, the wavelength division multiplexing subassembly and the right-angle prism.
2. A miniaturized wavelength division multiplexing optical receiving module as set forth in claim 1, wherein: the optical fiber collimator is also connected with an optical fiber ferrule assembly.
3. A miniaturized wavelength division multiplexing optical receiving module as set forth in claim 2, wherein: the optical fiber ferrule assembly comprises an LC or SC socket and an LC or SC connector.
4. A miniaturized wavelength division multiplexing optical receiving module as set forth in claim 1, wherein: the wavelength division demultiplexing subassembly is Z-Block, and the output end of the wavelength division demultiplexing subassembly is provided with a plurality of optical filters or optical filter films with different working wavelengths.
5. The miniaturized wavelength division multiplexing optical receiver module according to claim 4, wherein: the lens array comprises a plurality of plano-convex lenses which correspond to the light filtering films or the light filtering sheets on the Z-Block one by one, and the plane sides of the plano-convex lenses are connected with the right-angle prism.
6. The miniaturized wavelength division multiplexing optical receiver module according to claim 4, wherein: and an antireflection film or a non-coated film is arranged on the connecting surface of the lens array and the right-angle prism.
7. The miniaturized wavelength division multiplexing optical receiver module according to claim 4, wherein: the Z-Block is a four-channel Z-Block or an 8-channel Z-Block.
8. A miniaturized wavelength division multiplexing optical receiving module as set forth in claim 1, wherein: the optical substrate is made of glass, silicon or ceramic materials.
9. A miniaturized wavelength division multiplexing optical receiving module as set forth in claim 1, wherein: the right-angle prism is formed by Si material or glass material.
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