CN214540127U

CN214540127U - Wavelength division filter and isolator mixed mini wavelength division multiplexing device

Info

Publication number: CN214540127U
Application number: CN202120734217.0U
Authority: CN
Inventors: 叶雪梅; 叶满
Original assignee: Shanghai China Sciences Co ltd; Shanghai Zhongke Chuangxin Communication Equipment Co ltd; SHANGHAI CHINA SCIENCE FIBEROPTIC COMPONENTS CO Ltd
Current assignee: Shanghai China Sciences Co ltd; Shanghai Zhongke Chuangxin Communication Equipment Co ltd; SHANGHAI CHINA SCIENCE FIBEROPTIC COMPONENTS CO Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2021-10-29
Anticipated expiration: 2031-04-12

Abstract

The utility model relates to a mixed miniature wavelength division multiplexing device of wavelength division filter plus isolator, including big glass pipe, first little glass pipe, the little glass pipe of second, filter plate, first lens, second lens, first dual-fiber tail optical fiber, the dual-fiber tail optical fiber of second, mini isolator core, first little glass pipe and the little glass pipe of second place relatively inside big glass pipe, second lens be connected through the polishing angle of 8 degrees with the dual-fiber tail optical fiber of second, second lens and the dual-fiber tail optical fiber of second install in the little glass pipe of second, the inside of first little glass pipe be equipped with first dual-fiber tail optical fiber. Adopted the utility model discloses a mixed miniature wavelength division multiplexing device of wavelength division filter plus isolator, its operational mode is various, small, reverse isolation is high, insertion loss is little, bear the weight of the power height, can have stronger anti high temperature ability, return loss is high, the directionality is good, working property is stable. The method can be applied to the field of optical network systems.

Description

Wavelength division filter and isolator mixed mini wavelength division multiplexing device

Technical Field

The utility model relates to an optical communication field specifically indicates a mixed miniature wavelength division multiplexing device of wavelength division filter and isolator.

Background

In the prior art, all the optical fibers used by all the ports of the wavelength division multiplexer device are generally the same type of optical fiber, or all the ports are single mode optical fibers, or all the ports are multimode optical fibers; the single-mode optical fiber can only operate single-mode light with low loss, so that the single-mode light is transmitted in the single-mode optical fiber with low loss in a fundamental mode, the mode field diameter is very small, the clear aperture is limited, and larger power cannot be borne, but the transmitted single-mode light is relatively stable, the dispersion is small, and the polarization-dependent loss is small; the multimode fiber can allow multiple modes of light to be transmitted, not only a fundamental mode and a low-order mode, but also a higher-order mode can be transmitted, the fiber core is larger, the clear aperture is larger, larger power can be borne, but more transmission modes exist, so that the light beam is not particularly stable, and the chromatic dispersion is higher. The size of the wavelength division multiplexer in the prior art is generally 5.5x the outer diameter and 34mm in length, reverse isolation capability is not provided, and the size of the whole device is larger; the utility model discloses an overcome as above shortcoming, provide one the utility model relates to a wavelength division filter of single mode and multimode mode double-purpose adds isolator mixing minitype device and debugging structure has used double-clad fibre, and double-clad fibre has two core footpaths, a single mode fibre core, a multimode cladding fibre core, and its double-clad fibre single mode fibre core footpath not only can be conventional 9um size, also can be little to 5um size. The multimode first cladding core is 105um, the second cladding diameter 125um, and the cladding diameter 245 um. The package size is 3.2mm in diameter and 22mm in length, has reverse isolation power, and can be widely used in EDFA, DWDM networks, wavelength routing, optical fiber instruments and CATV optical systems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the shortcoming of above-mentioned prior art, provide one kind and satisfied compact structure, stability height, the comparatively extensive wavelength division filter of application scope adds the mixed miniature wavelength division multiplexing device of isolator.

In order to achieve the above object, the wavelength division filter and isolator hybrid mini wavelength division multiplexing device of the present invention comprises:

the wavelength division filter and isolator hybrid mini wavelength division multiplexing device is mainly characterized by comprising a large glass tube, a first small glass tube, a second small glass tube, a first lens and a filter plate, a second lens, a first dual-optical tail fiber, a second dual-optical tail fiber and a mini isolator core, wherein the first small glass tube and the second small glass tube are oppositely placed in the large glass tube, the second lens and the second dual-optical tail fiber are connected through a polishing angle of 8 degrees, the second lens and the second dual-optical tail fiber are installed in the second small glass tube, the first lens and the first dual-optical tail fiber are connected through a polishing angle of 8 degrees, the first dual-optical tail fiber is arranged in the first small glass tube, and the mini isolator core is arranged between the first lens and the filter plate.

Preferably, the device further comprises a debugging structure, the debugging structure comprises two single-mode fibers respectively connected with the two double-clad fibers, and the diameter of the fiber core of the single-mode fiber is matched with that of the single-mode fiber core of the double-clad fiber.

Preferably, the second dual-fiber pigtail comprises two dual-clad fibers, the distance between the two dual-clad fibers is 200um, the center length is 3mm, the polishing angle of the end face of the pigtail is 8 degrees, the pigtail is plated with a 1260-1620 nm broadband antireflection film layer, and the high-low point connecting line of the 8-degree surface of the pigtail is parallel to the high-low point connecting line of the lens.

Preferably, the curvature radius of the second lens is 1.4mm, the length of the second lens is 3.1mm, the end face polishing angle is 8 degrees, the second lens is coated with a 1260-1620 nm broadband antireflection film layer, and the high-low point connecting line of the 8-degree surface of the second lens is parallel to the high-low point connecting line of the single optical fiber pigtail.

Preferably, the first double-clad optical fiber comprises two double-clad optical fibers, the distance between the two double-clad optical fibers is 200um, the center length is 4mm, the polishing angle of the end face of the tail optical fiber is 8 degrees, the tail optical fiber is plated with a corresponding antireflection film layer, and the high-low point connecting line of the 8-degree surface of the tail optical fiber is parallel to the high-low point connecting line of the lens.

Preferably, the radial graded index lens of the first lens has an outer diameter of 1.8mm, a focusing constant of 0.322, a 0.248pitch intercept, a polishing angle of 8 degrees at one end and a polishing angle of 0 degree at the other end, and both ends are coated with corresponding antireflection film layers.

Adopted the utility model discloses a mixed miniature wavelength division multiplexing device of wavelength division filter plus isolator, its operational mode is various, small, reverse isolation is high, insertion loss is little, bear the weight of the power height, can have stronger anti high temperature ability, return loss is high, the directionality is good, working property is stable. The method can be applied to the field of optical network systems.

Drawings

Fig. 1 is a structural diagram of the wavelength division filter plus isolator hybrid mini wavelength division multiplexing device of the present invention.

Fig. 2 is a schematic diagram of a debugging system of the wavelength division filter plus isolator hybrid mini wavelength division multiplexing device according to the present invention.

Fig. 3 is a schematic structural diagram of the collimator end of the wavelength division filter plus isolator hybrid mini wavelength division multiplexing device according to the present invention.

Fig. 4 is a schematic structural view of the dual optical components of the filter plate composed by the filter plate of the wavelength division filter plus isolator hybrid mini wavelength division multiplexing device of the present invention.

Fig. 5 is a schematic structural diagram of an isolator core of the wavelength division filter plus isolator hybrid mini wavelength division multiplexing device according to the present invention.

Reference numerals:

1 double-clad optical fiber

2 first dual-fiber pigtail

3 first lens plus filter plate

4 isolator core

5 second lens

6 second double-optical tail fiber

71 first small glass tube

72 second glass vial

8 big glass tube

9 single mode optical fiber

Detailed Description

In order to more clearly describe the technical content of the present invention, the following further description is given with reference to specific embodiments.

The utility model discloses a mixed miniature wavelength division multiplexing device of this wavelength division filter adds isolator, including big glass pipe, first little glass pipe, the little glass pipe of second, first lens add filter plate, second lens, first dual-optical tail fiber, the dual-optical tail fiber of second, mini isolator core, first little glass pipe and the little glass pipe of second place relatively inside big glass pipe, second lens and the dual-optical tail fiber of second be connected through the polishing angle of 8 degrees, second lens and the dual-optical tail fiber of second install in the little glass pipe of second, first lens and the polishing angle of first dual-optical tail fiber through 8 degrees be connected, the inside of first little glass pipe be equipped with first dual-optical tail fiber, first lens add and be provided with a mini isolator core between filter plate and the second lens.

As the preferred embodiment of the present invention, the device further comprises a debugging structure, the debugging structure comprises two single-mode fibers connected to the two double-clad fibers, respectively, and the fiber core diameter of the single-mode fibers is matched with the single-mode fiber core of the double-clad fibers.

As the utility model discloses a preferred embodiment, the second double-clad tail optical fiber contain two double-clad optic fibers, two double-clad optic fibers's interval be 200um, central length is 3mm, tail optical fiber terminal surface polishing angle 8 degrees and plated 1260 ~ 1620nm broadband antireflection rete, the line of height point and the lens height point line of its 8 degrees faces are parallel.

As the preferred embodiment of the utility model, the radius of curvature of second lens be 1.4mm, length is 3.1mm, the terminal surface polishing angle 8 degrees and plated 1260 ~ 1620nm broadband antireflection coating, the high-low point line and the high-low point line of single fiber pigtail of its 8 degrees face are parallel.

As the preferred embodiment of the present invention, the first dual-fiber pigtail include two dual-clad fibers, the distance between the two dual-clad fibers is 200um, the center length is 4mm, the polished angle of the pigtail end surface is 8 degrees and has been plated with a corresponding anti-reflection film layer, and the high-low point connecting line of the 8 degrees surface is parallel to the high-low point connecting line of the lens.

As the preferred embodiment of the utility model, the radial graded index lens external diameter of first lens be 1.8mm, the focus constant is 0.322, has 0.248pitch intercept, one end polishing angle 8 degrees, another section polishing angle 0 degrees, both ends are all the corresponding antireflection coating of coating film.

The utility model discloses an among the embodiment, a wavelength division filter of single mode and multimode mode double-purpose adds mixed minitype device of isolator and debugging structure thereof is disclosed, its structure chart is as shown in figure 1. It comprises a large glass tube with the outer diameter of 3.2 multiplied by 16mm, two glass tubes with the outer diameter of 2.4 multiplied by 5mm, a plano-convex lens R1.4mm L3.1mm OD1.8mm CLENS, a focusing constant of 0.322, the pitch length of 0.248P (pitch) (the length of which is nearly 1/4 cycle long), an OD1.8mm radial graded index lens and two double-clad optical fiber double-optical tail fibers. If the single-mode fiber core of the double-clad fiber is 5um, two Corning Hi980 fibers are needed for the debugging structure, the mode field diameter is 4.2um, the debugging structure is matched with the 5um single-mode fiber core double-clad fiber, and light beams can be completely injected into the 5um single-mode fiber core double-clad fiber; if the optical fiber is a 9um single-mode fiber core double-clad optical fiber, the SMF-28 single-mode optical fiber is required to be used, the physical diameter of the fiber core of the optical fiber is 8.2um, the optical fiber core is matched with the corresponding double-clad optical fiber single-mode fiber core, and light beams can be completely injected into the 9um single-mode fiber core double-clad optical fiber, so that single-mode filtering and adjustment can be performed during debugging, as shown in figure 2.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds mixed minitype device of isolator and debugging structure thereof, its operational mode is various, small, reverse isolation is high, insertion loss is little, bear the weight of the power height, can have stronger anti high temperature ability, return loss height, the directionality is good, working property is stable. The method can be applied to the field of optical network systems.

The device structure and the debugging structure can cover the ultra-small core diameter double-clad optical fiber, the single-mode core diameter can be as small as 5um, and the device can be widely used in EDFA, DWDM networks, wavelength routing, optical fiber instruments and CATV optical systems.

The collimator comprising one branch

The double-optical tail fiber comprises two double-clad optical fibers, a capillary with a C200um space, a polished end face of the tail fiber is at an angle of 8 degrees and is coated with a 1260-1620 nm broadband antireflection film layer, and a high-low point connecting line of an 8-degree surface of the double-optical tail fiber is parallel to a high-low point connecting line of a lens, and the figure is 3). The dual-fiber collimator can be made into a three-port single-mode and multi-mode dual-purpose wavelength division filter plus isolator hybrid mini device by using one double-clad fiber, a public end, a reflection end and a transmission end, or can be made into a four-port single-mode and multi-mode dual-purpose wavelength division filter plus isolator hybrid mini device by using two double-clad fibers, and the dual-fiber collimator comprises a public end, a reflection end, a transmission end and a Tap end.

The collimator comprises a grain

A plano-convex lens with curvature radius of R1.4mm and length of 3.1mm (end face polishing angle of 8 degrees and plating 1260-1620 nm broadband antireflection film layer, high-low point connecting line of 8-degree surface and high-low point of single optical fiber tail fiberThe connecting lines are parallel). If the device is made into a mixed mini device of a wavelength division filter and an isolator with double purposes of a four-port single mode and a multi-mode, the end face needs to be coated with a film of a broadband Tap film layer, such as a Tap film layer with 99% anti-reflection and 1% reflection.

The collimator comprises a mini glass tube with an outer diameter of 2.4X a length of 5 mm.

The filter double-optical component consists of a double-optical-fiber double-optical tail fiber, a radial graded index lens and a filter with the size of 1.4 multiplied by the width of 1.4 multiplied by the height of 1.0 mm. The tail optical fiber has a spacing

A dual-light capillary. The optical fiber comprises two double-clad optical fibers, the end face of the tail fiber is polished at an angle of 8 degrees and is plated with a corresponding antireflection film layer, and a high-low point connecting line of the 8-degree face of the optical fiber is parallel to a high-low point connecting line of a lens.

The dual-optical component of the filter plate comprises a radial gradient refractive index lens with the outer diameter OD1.8mm, the focusing constant of 0.322 and the intercept of 0.248pitch, wherein one end of the dual-optical component is polished at an angle of 8 degrees, one section of the dual-optical component is polished at an angle of 0 degree, and both sides of the dual-optical component are coated with corresponding anti-reflection film layers.

The filter plate constitutes a filter plate double-optical component which comprises a miniaturized glass tube with the outer diameter of 2.4 multiplied by the length of 5 mm.

The device comprises a mini isolator core piece, wherein the mini isolator core piece comprises one OD2.58 multiplied by ID1.62 multiplied by L1.5mm magnetic ring and one mini PMD sheet, the size is 1.25 multiplied by 0.8mm, the magnetic ring comprises one mini Faraday piece (the size is 0.88 multiplied by 0.45mm) and two mini wedge pieces (the size is 1.1 multiplied by 0.3mm), and the mini isolator is bonded in a glass tube with the outer diameter of 3.2 multiplied by the length of 16mm through ultraviolet glue.

The device comprises a glass tube with an outer diameter of 3.2X and a length of 16mm, and is wrapped on

The single-fiber dual-light collimator and the filter plate form a dual-light component.

If the single-mode fiber core of the double-clad optical fiber is 5um, the debugging structure needs two Corning Hi980 optical fibers, the mode field diameter of the debugging structure is 4.2um, the debugging structure is matched with the 5um single-mode fiber core double-clad optical fiber, and light beams can be completely injected into the 5um single-mode fiber core double-clad optical fiber; if 9um single mode fibre core double-clad fibre, need to use two SMF-28 single mode fibre, the physical diameter 8.2um of its fibre core matches with corresponding 9um single mode fibre core double-clad fibre single mode fibre core, can all inject the light beam into 9um single mode fibre core double-clad fibre in to single mode filters and adjusts during the debugging.

The utility model adopts the technical proposal that:

1. one branch

The double-optical fiber collimator comprises the following optical components:

(1) the collimator of which comprises one branch

(2) One granule

The curvature radius of the plano-convex lens is R1.4mm, the length is 3.1mm (the end face polishing angle is 8 degrees, the plano-convex lens is coated with a 1260-1620 nm broadband antireflection film layer, and the high-low point connecting line of the 8-degree surface of the plano-convex lens is parallel to the high-low point connecting line of the single-fiber tail fiber). If the device is made into a mixed mini device of a wavelength division filter and an isolator with double purposes of a four-port single mode and a multi-mode, the end face needs to be coated with a film of a broadband Tap film layer, such as a Tap film layer with 99% anti-reflection and 1% reflection.

(3) A mini glass tube with an outer diameter of 2.4X length of 5mm is shown in FIG. 3.

2. The filter double-optical component comprises a double-optical-fiber double-optical tail fiber, a radial graded index lens and a filter with the size of 1.4 multiplied by the width of 1.4 multiplied by the height of 1.0mm, and specifically comprises the following optical parts:

1) the double optical tail fiber has a spacing

A dual-light capillary. The optical fiber comprises two double-clad optical fibers, the end face of the tail fiber is polished at an angle of 8 degrees and is plated with a corresponding antireflection film layer, and a high-low point connecting line of the 8-degree surface of the optical fiber is parallel to a high-low point connecting line of a lens, as shown in figure 4.

2) The outer diameter OD1.8mm of the radial graded index lens, the focusing constant 0.322, the 0.248pitch intercept, the polishing angle of 8 degrees at one end and the polishing angle of 0 degree at one section, and the two sides of the radial graded index lens are coated with corresponding antireflection film layers, as shown in FIG. 4.

3) And a miniaturized glass tube with an outer diameter of 2.4 multiplied by 5mm in length as shown in figure 4.

3. A mini isolator core piece comprising one OD2.58 XID 1.62 XL1.5mm magnetic ring and one mini PMD sheet having a size of 1.25X 0.8mm, the magnetic ring comprising one mini Faraday (size of 0.88X 0.45mm) and two mini wedge sheets (size of 1.1X 0.3mm) as shown in FIG. 5. The mini isolator is bonded in the glass tube with the outer diameter of 3.2 multiplied by the length of 16mm through ultraviolet glue.

4. A glass tube with an outer diameter of 3.2X length of 16mm is shown in FIG. 1.

5. The debug architecture is shown in figure 2.

The utility model discloses a wave division filter of single mode and multimode mode double-purpose adds the wholeness ability of the mixed minitype device of isolator and is superior to conventional 980/1590 wavelength division multiplexing blender, and its optic fibre is double-clad optic fibre, can be simultaneously and single mode or multimode light travel in its optic fibre and propagate, and the reflection end if multimode light beam moves, its directionality also can reach 50 decibels, does not have unnecessary astigmatism to flow in other optic fibres.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds isolator and mixes mini device and debug system thereof, its size can reach external diameter 3.2 x length 22 mm.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds isolator and mixes mini device and debug system uses double-clad and multimode fiber, can single multimode dual-purpose, both has single mode photostability transmission ability, also has multimode fiber's high power bearing capacity.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds mixed miniature device of isolator and debug system thereof, its directionality is high, and it is little to crosstalk, reaches more than 50 dB.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds mixed miniature device of isolator and debug system thereof, reverse isolation is high, reaches more than 35 decibels in the normal atmospheric temperature bandwidth.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds isolator and mixes mini device and debug system thereof, through ingenious debugging and structural design, can inject single mode light almost all into double-clad single mode fibre core, CPR < 10% (CPR is called The clamping Power Ratio entirely for The test gets into The first Cladding Power size of optic fibre).

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds mixed miniature device of isolator and debug system thereof can make into three-port device and also can make four port devices, and the structure flexibility ratio is high.

The utility model discloses a wavelength division filter of single mode and multimode mode double-purpose adds mixed minitype device of isolator and debug system uses double-clad optic fibre, and its external diameter 3.2 x length 22mm, reverse isolation >30 decibels can be applied to the optical network system field.

In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.

Claims

1. The device comprises a large glass tube, a first small glass tube, a second small glass tube, a first lens and a filter plate, a second lens, a first dual-optical tail fiber, a second dual-optical tail fiber and a mini isolator core, wherein the first small glass tube and the second small glass tube are oppositely placed in the large glass tube, the second lens and the second dual-optical tail fiber are connected through a polishing angle of 8 degrees, the second lens and the second dual-optical tail fiber are installed in the second small glass tube, the first lens and the first dual-optical tail fiber are connected through a polishing angle of 8 degrees, the first dual-optical tail fiber is arranged in the first small glass tube, and the mini isolator core is arranged between the first lens and the filter plate.

2. The wdm filter and isolator hybrid mini wdm device of claim 1, further comprising a tuning structure, wherein said tuning structure comprises two single mode fibers respectively connected to two double clad fibers, and wherein the diameter of said single mode fiber matches the single mode fiber core of said double clad fibers.

3. The WDM device according to claim 1, wherein the second dual-fiber pigtail comprises two double-clad fibers with a gap of 200um and a center length of 3mm, the pigtail has an end face polished at an angle of 8 degrees and coated with a 1260-1620 nm broadband antireflection coating, and the line of the high and low points of the 8-degree surface is parallel to the line of the high and low points of the lens.

4. The WDM device according to claim 1, wherein the second lens has a radius of curvature of 1.4mm, a length of 3.1mm, a polished end surface with an angle of 8 degrees and coated with 1260-1620 nm wide-band antireflection film, and the lines of the high and low points of the 8-degree surface are parallel to the lines of the high and low points of the single fiber pigtail.

5. The wdm optical filter and isolator hybrid wavelength division multiplexing device according to claim 1, wherein said first dual-clad fiber comprises two dual-clad fibers, said two dual-clad fibers have a gap of 200um, a center length of 4mm, a polished pigtail end face angle of 8 degrees and coated with a corresponding anti-reflection film layer, and a connection line of high and low points of the 8-degree surface is parallel to a connection line of high and low points of the lens.

6. The wdm apparatus of claim 1, wherein the first lens has a radial graded index lens with an outer diameter of 1.8mm, a focusing constant of 0.322, a 0.248pitch intercept, a polishing angle of 8 degrees at one end and a polishing angle of 0 degrees at the other end, and both ends are coated with antireflection coating.