CN201057644Y

CN201057644Y - Channel protection type optical branching device structure

Info

Publication number: CN201057644Y
Application number: CNU2007200337735U
Authority: CN
Inventors: 孙小菡; 刘旭; 肖金标; 蔡纯
Original assignee: Southeast University
Current assignee: Southeast University
Priority date: 2007-01-23
Filing date: 2007-01-23
Publication date: 2008-05-07
Anticipated expiration: 2017-01-23

Abstract

The utility model discloses a channel protect type optical splitter structure, which comprises an input fiber, a PLC type double-inlet multi-output (2 multiplied by N) splitter module and a group of N output fibers; the input fiber comprises a first input fiber and a second input fiber, the input port of the first input fiber and the input port of the second input fiber are both connected with the output ports of the group of N output fibers through the PLC type double-inlet multi-output (2 multiplied by N) splitter module, and the multi-circuit distribution of the input optical signal can be realized. The utility model has good reliability, small inserting loss, large echo loss, good directivity, uniform splitting ratio; by adopting a lens fiber as the input fiber and output fiber, the coupling efficiency of the input channel and output channel can be improved; with active apparatus such as a semiconductor laser power supply, etc. and passive apparatus such as a III-V group modulator/optical switch, a filter, etc., the utility model can realize monolithic integration or hybrid integration.

Description

A kind of path protection type optical branching device structure

One, technical field

The utility model belongs to optoelectronics and integrated optics technique field; relate to a kind of plane light wave splitter, specifically a kind of high speed optical communication system, optical signal processing system, optical interconnection network, Optical CATV engineering of being used for carries out the path protection type optical branching device structure that optical signal power distributes.

Two, technical background

Optical branching device be in application such as optical communication system, optical signal processing system, optical interconnection network, Optical CATV engineering, light signal is coupled, a kind of optical passive component of branch, distribution, difference by processes can be divided into two kinds on optical-fiber type and planar lightwave circuit (PLC) type.PLC type splitter is many at present realizes on backing materials such as silicon, glass, quartz, polymer, and only provides 1 * N light along separate routes.The shortcoming of the optical branching device of this 1 * N light shunt structure is: poor reliability, optical branching device are when constituting EPON, in case input channel breaks down the also interruption thereupon of user of N the branch road of being told by 1 * N splitter; In addition, select for use as silicon, glass, quartz, polymer etc. as backing material, be difficult to realize with integrated based on the active device of III-V family semi-conducting material if make PLC.

Three, summary of the invention

At the deficiency of present PLC type 1 * N splitter in application, the purpose of this utility model has provided a kind of path protection type optical branching device structure, when this splitter damages in a certain input channel, can enable another input channel.Simultaneously from realizing the demand of light function integration module, the extra input channel that increases certainly will cause inserting the loss increase, for realizing the efficient coupling of optical fiber and chip, input channel all directly links to each other with chip with lens fiber with output channel, has reduced the use of discrete lens.

The purpose of this utility model is achieved through the following technical solutions:

A kind of path protection type optical branching device structure is characterized in that: it advances to have more (2 * N) splitter modules, one group of N output optical fibre formation by input optical fibre, PLC type are two; Described input optical fibre comprises first input optical fibre and second input optical fibre, the input port of the input port of first input optical fibre and second input optical fibre all is connected with the output port of one group of N output optical fibre by PLC type 2 * N splitter module, and the multichannel of realization input optical signal is told.

In the utility model, first input optical fibre and its input port constitute first input channel; Second input optical fibre and its input port constitute second input channel; During normal condition, have only an input channel using, if when first input channel of using breaks down, the second standby input channel promptly comes into operation.So just can not influence the normal delivery of light signal.

Be to improve the transmission efficiency of light signal, first input optical fibre and second input optical fibre are to improve extraordinary lens fibers such as the taper of input channel coupling efficiency or wedge shape.One group of N output optical fibre is the lens fiber or the standard single-mode fiber (SMF) that can improve the output channel coupling efficiency.

Tapered lensed fiber has been realized convergence to the Gaussian beam of SMF, with hot spot mode field diameter boil down to 4～5um, improved with the misfortune of PLC with respect to SMF and to have closed efficient, but the elliptical modes spot of circular light spot and PLC still exists the part mismatch, and the PLC Waveguide end face is being damaged easily with aiming at of chip in its sharp cone distal end in the adjustment process.Wedge-shaped lens optical fiber is that standard single-mode fiber is processed into the wedge shape of certain angle with the optics abrasive method, end face is made that the microsize cylindrical lens obtains again.It can export ellipse light spot, improves spotlight effect, and the efficient misfortune of light field is incorporated into the PLC waveguide core layer, prevents to greatest extent to enter the light leakage phenomena that waveguide core layer causes in addition by light field.

In the utility model, encourage the PLC chip efficiently, receive and output by one group of N output optical fibre through the bifurcated waveguide by input lens optical fiber.

Compared with prior art, the utility model has the advantages that: have redundant input channel, improved the reliability of optical branching device greatly; Can realize with based on the various types of substrates material, the active/passive device monolithic of III-V family semi-conducting material or mix integrated especially; The insertion loss is little, return loss big, direction is told, splitting ratio is even, compact conformation, and environmental stability is good.

Four, description of drawings

Fig. 1 is a structured flowchart of the present utility model

Fig. 2 is that wedge-shaped lens optical fiber and PLC chip misfortune are closed schematic diagram

Fig. 3 is wedge-shaped lens optical fiber outgoing light field simulation result figure

Fig. 4 is the tapered lensed fiber schematic diagram

Fig. 5 is 2 * 4 splitter schematic diagrames in the utility model

Fig. 6 is 2 * 4 splitter test results in the utility model

Five, embodiment

Embodiment 1

Fig. 1 is a structural representation of the present utility model.By input optical fibre 1, the PLC type is two to be advanced to have more (2 * N) splitter modules 2, one group of N output optical fibre 3 formation.Wherein, the input port 121 that input optical fibre 1 comprises the input port 111 of first input optical fibre 11 and second input optical fibre, 12, the first input optical fibres 11 and second input optical fibre 12 all advances to have more by the PLC type is two that (2 * N) splitter modules 2 are connected with the output port 31 of one group of N output optical fibre 3.

Input optical fibre 1 closes port 4 with splitter module 2 by misfortune with one group of N output optical fibre 3 and is connected.Wherein, output optical fibre 3 has the N road.Light field is closed port 4 through input optical fibre 1 with the misfortune of splitter module 2 and is entered PLC splitter module 2 from input optical fibre 1 input, closes port 4 via output optical fibre 3 with the lotus root of splitter module 2 again and enters output optical fibre 3, realizes that the multichannel of input optical signal is told.

Fig. 2 is that wedge-shaped lens optical fiber and PLC chip misfortune are closed schematic diagram.Wherein, θ is that the angle of wedge of cuneiform optical fiber, end face cylindrical lens radius of curvature, a that R is cuneiform optical fiber are the SMF fiber core radius, and D is the Lengthwise mismatch of wedge-shaped lens optical fiber and PLC chip chamber.Optical fiber and PLC chip have best vertical, horizontal, angle mismatch relation.

Fig. 3 is wedge-shaped lens optical fiber outgoing light field simulation result figure, and its transmission light field is an Elliptical Gaussian Beam, mates fully with PLC chip eigen mode field.

Embodiment 2

Fig. 4 is the tapered lensed fiber schematic diagram.Wherein, taper is a tapering part, and lens is lens; P _C1Be cladding radius, ρ is the sandwich layer radius, and α is the sandwich layer semi-cone angle, z _tBe the length of tapering part, R _LBe lens radius of curvature.

Fig. 5 is 2 * 4 splitter schematic diagrames in the utility model.The PLC splitter module comprises an X branch units and two Y branch unitss of Y1, Y2.First input optical fibre 11 constitutes first input channel with its input port 111; Second input optical fibre 12 constitutes second input channel with its input port 121; One group of four output port 31 and one group of four output optical fibre 3 constitute one group of four output channel.

During normal condition, have only first input channel using, light field is from 11 inputs of first input optical fibre, close port 4 through input optical fibre 11 with the lotus root of splitter module 2 and enter PLC splitter module 2, close port 4 via output optical fibre 3 with the lotus root of splitter module 2 again and enter four output optical fibres 3, realize that four road of input optical signal tell.When if first input channel of using breaks down, the second standby input channel promptly comes into operation.At this moment, light field is from 12 inputs of second input optical fibre, close port 4 through input optical fibre 12 with the misfortune of splitter module 2 and enter PLC splitter module 2, close port 4 via output optical fibre 3 with the misfortune of splitter module 2 again and enter four output optical fibres 3, realize that four road of input optical signal tell.So just can not influence the normal delivery of light signal.

Fig. 6 is the test result of 2 * 4 splitters in the utility model.1310nm and 1550nm EELED light source by four output channel outputs, are realized power-sharing by input channel incident between output port.

Claims

1. path protection type optical branching device structure is characterized in that: it is made of input optical fibre (1), PLC type double-in multi-out splitter module (2), one group N output optical fibre (3); Described input optical fibre (1) comprises first input optical fibre (11) and second input optical fibre (12), the input port (111) of first input optical fibre (11) and the input port (121) of second input optical fibre (12) all are connected with the output port (31) of one group N output optical fibre (3) by PLC type double-in multi-out splitter module (2), realize that the multichannel of input optical signal is told.

2. a kind of path protection type optical branching device structure according to claim 1 is characterized in that: first input optical fibre (11) constitutes first input channel with its input port (111); Second input optical fibre (12) constitutes second input channel with its input port (121); When first input channel of using broke down, the second standby input channel promptly came into operation.

3. a kind of path protection type optical branching device structure according to claim 1, it is characterized in that: first input optical fibre (11) and second input optical fibre (12) they are the lens fibers that can improve the input channel coupling efficiency; One group N output optical fibre (3) is the lens fiber or the standard single-mode fiber that can improve the output channel coupling efficiency.

4. a kind of path protection type optical branching device structure according to claim 3; it is characterized in that: described input optical fibre (1) is wedge shape or tapered lensed fiber; light field incident lens fiber encourages the PLC chip efficiently, is received and output by one group N output optical fibre (3) through the bifurcated waveguide.