A grating type wide wave tunable filter and an optical performance monitoring module

Abstract

The utility model relates to optical communication technical field especially relates to a grating type wide wave tunable filter and optical performance monitoring module, and tunable filter includes optical fiber array subassembly, collimation subassembly, grating subassembly, focusing subassembly and microcomputer electro mechanical reflection subassembly, optical fiber array subassembly receives multi -wavelength input light, and transmits multi -wavelength input light to collimation subassembly, collimation subassembly makes multi -wavelength input light parallel incidence to grating subassembly, grating subassembly splits light to each single -wavelength input light to multi -wavelength input light, focusing subassembly focuses each single -wavelength input light and is incident to microcomputer electro mechanical reflection subassembly, and microcomputer electro mechanical reflection subassembly carries out tunable filtering to each single -wavelength input light, the utility model uses optical fiber array subassembly as single -input multiple -output port and receives multi -wavelength input light, and through grating subassembly splits light to each single -wavelength input light to multi -wavelength input light, carries out tunable filtering to each single -wavelength input light, realizes to the function of the simultaneous filtering of multi -wavelength light of combiner transmission.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical communication technical field especially relates to a grating type wide wave tunable filter and optical performance monitoring module. BACKGROUND

[0002] Tunable optical filter (Tunable Optical Filter, for short: TOF) is the important device in modern intelligent optical network, is mainly applied to dense wavelength division multiplexing (Dense Wavelength Division Multiplexing, for short: DWDM) system optical performance monitoring, and its research and development have very important significance to flexible selection and dynamic monitoring optical channel. The tunable filter in prior art scheme has the shortcoming of complex structure, and because the light of multiple wavebands such as C waveband and L waveband is usually combined wave transmission in the existing communication transmission system, the tunable filter in prior art is difficult to simultaneously filter the combined wave transmission multiple wavelength light, such as difficult to simultaneously filter C+L waveband.

[0003] In view of this, overcoming the defects of the prior art is a problem to be solved in the technical field. INVENTION CONTENTS

[0004] The utility model relates to a grating type wide wave tunable filter and optical performance monitoring module to solve the problem that tunable filter is difficult to simultaneously filter the combined wave transmission multiple wavelength light.

[0005] The utility model is realized in this way:

[0006] Firstly, the utility model provides a grating type wide wave tunable filter, including optical fiber array subassembly 1, collimation subassembly 2, grating subassembly 3, focusing subassembly 4 and micro electro mechanical reflection subassembly 5;

[0007] Optical fiber array subassembly 1, collimation subassembly 2, grating subassembly 3, focusing subassembly 4 and micro electro mechanical reflection subassembly 5 are coupled along the light path in turn;

[0008] Optical fiber array subassembly 1 is used to receive multiple wavelength input light from input port and transmit the multiple wavelength input light to collimation subassembly 2;

[0009] Collimation subassembly 2 is used to convert the multiple wavelength input light from divergent light into parallel light, and make the multiple wavelength input light parallel incidence to grating subassembly 3;

[0010] Grating subassembly 3 is used to split the multiple wavelength input light and obtain multiple single wavelength input light of different wavelengths;

[0011] The focusing assembly 4 is used for focusing each single-wavelength input light to different positions of the micro-electro-mechanical reflective assembly 5.

[0012] The micro-electro-mechanical reflective assembly 5 is used for tunable filtering each single-wavelength input light to obtain each single-wavelength reflected light, and making the single-wavelength reflected light sequentially pass through the focusing assembly 4, the grating assembly 3 and the collimating assembly 2 to reach different output ports of the fiber array assembly 1 for output.

[0013] Preferably, the focusing assembly 4 comprises a focusing unit 41 and a collimating unit 42.

[0014] The collimating unit 42 is arranged at a preset distance position in front of the focal point of the focusing unit 41 or a preset distance position behind the focal point.

[0015] The focusing unit 41 is used for converting each single-wavelength input light from large-spot parallel light to focused light, and the collimating unit 42 is used for converting each single-wavelength input light from focused light to small-spot parallel light, so that each single-wavelength input light is incident to the corresponding position of the micro-electro-mechanical reflective assembly 5 in the form of small-spot parallel light.

[0016] Preferably, when the collimating unit 42 is arranged at the preset distance position in front of the focal point of the focusing unit 41, the collimating unit 42 is a concave lens.

[0017] Preferably, when the collimating unit 42 is arranged at the preset distance position behind the focal point of the focusing unit 41, the collimating unit 42 is a convex lens.

[0018] Preferably, the angle difference between the normal line of the mirror of the micro-electro-mechanical reflective assembly 5 and the optical axis of the collimating assembly 2 is within a preset angle range.

[0019] Preferably, the micro-electro-mechanical reflective assembly 5 is a micro-electro-mechanical system with a mirror.

[0020] Preferably, the fiber array assembly 1 is provided with one input port and three output ports.

[0021] The three output ports are respectively used for outputting first single-wavelength reflected light, second single-wavelength reflected light and third single-wavelength reflected light.

[0022] Preferably, the multi-wavelength input light comprises one or more of a first wavelength, a second wavelength and a third wavelength; wherein the first wavelength, the second wavelength and the third wavelength are located in a C band and / or an L band.

[0023] In a second aspect, the utility model provides a kind of optical performance monitoring module, comprising a plurality of detection components and the grating type wide wave tunable filter of first aspect;

[0024] The detection components are arranged at output ports of the grating type wide wave tunable filter, and are used for converting single wavelength output light into electrical signals for optical performance monitoring.

[0025] Preferably, the detection component is a photoelectric detector.

[0026] Compared with the prior art, the embodiment of the utility model has the beneficial effects that: the utility model discloses uses the fiber array component as single input multi-output port to receive multiple wavelength input light, and the grating component is used to split the multiple wavelength input light to obtain each single wavelength input light, so that the tunable filtering of each single wavelength input light can be realized, and finally output through each output port of the fiber array component, thereby realizing the function of simultaneously filtering the multiple wavelength light of the combined wave transmission, and within the tolerance range of the lens, the output port of the fiber array can be continuously expanded, thereby supporting more wavelength simultaneous filtering. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 A structure schematic diagram of a grating type wide wave tunable filter is provided for the embodiment of the utility model;

[0029] Figure 2 A structure schematic diagram of a grating type wide wave tunable filter is provided for the embodiment of the utility model;

[0030] Figure 3 A structure schematic diagram of a grating type wide wave tunable filter is provided for the embodiment of the utility model;

[0031] Figure 4 A structure schematic diagram of a grating type wide wave tunable filter is provided for the embodiment of the utility model;

[0032] Figure 5 A structure schematic diagram of a grating type wide wave tunable filter is provided for the embodiment of the utility model;

[0033] Figure 6 A structure schematic diagram of an optical performance monitoring module is provided for the embodiment of the utility model.

[0034] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein:

[0035] 1. Fiber optic array assembly; 2. Collimation assembly; 3. Grating assembly; 4. Focusing assembly; 41. Focusing unit; 42. Collimation unit; 5. Microelectromechanical reflection assembly. Detailed Implementation

[0036] In the description of this utility model, the terms "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not require that this utility model must be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] In this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0038] In this application, unless otherwise expressly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, the term "coupled" can refer to an electrical connection that enables signal transmission.

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0040] Example 1:

[0041] This utility model embodiment provides a grating-type wideband tunable filter, such as... Figure 1 As shown, it includes fiber array assembly 1, collimation assembly 2, grating assembly 3, focusing assembly 4, and microelectromechanical reflection assembly 5;

[0042] The fiber array assembly 1, the collimation assembly 2, the grating assembly 3, the focusing assembly 4, and the microelectromechanical reflection assembly 5 are sequentially coupled along the optical path; in a practical application scenario, the microelectromechanical reflection assembly 5 is a microelectromechanical system (MEMS) with a reflector.

[0043] The optical fiber array assembly 1 is used to receive the multi-wavelength input light from the input port and transmit the multi-wavelength input light to the collimation assembly 2; the multi-wavelength input light can be generated by a laser or can be transmitted in a fiber after being combined, and the optical fiber array assembly 1 is connected at the output end of the laser or one end of the fiber to input the multi-wavelength input light into the optical fiber array assembly 1.

[0044] The collimation assembly 2 is used to convert the multi-wavelength input light from divergent light into parallel light, so that the multi-wavelength input light is incident on the grating assembly 3 in parallel; the grating assembly 3 is used to split the multi-wavelength input light to obtain single-wavelength input light of different wavelengths; in actual use, the splitting is specifically: making light of different wavelengths exit at different diffraction angles, so as to achieve the purpose of splitting.

[0045] The focusing assembly 4 is used to focus each single-wavelength input light to different positions of the micro-electro-mechanical reflective assembly 5; the micro-electro-mechanical reflective assembly 5 is used to tuneably filter each single-wavelength input light to obtain single-wavelength reflected light, and make the single-wavelength reflected light sequentially pass through the focusing assembly 4, the grating assembly 3 and the collimation assembly 2 to different output ports of the optical fiber array assembly 1 for output.

[0046] The embodiment uses the optical fiber array assembly 1 as a single-input multi-output port to receive multi-wavelength input light, and splits the multi-wavelength input light by the grating assembly 3 to obtain each single-wavelength input light, so as to tuneably filter each single-wavelength input light and finally output through each output port of the optical fiber array assembly 1, thereby realizing the function of simultaneously filtering the multi-wavelength light transmitted in combination, and within the tolerance range of the lens, the output ports of the optical fiber array can be continuously expanded to support more simultaneous filtering of wavelengths.

[0047] In an alternative embodiment, as shown in Figure 2 and Figure 3 The focusing assembly 4 includes a focusing unit 41 and a collimation unit 42; the collimation unit 42 is arranged at a position in front of the focal point of the focusing unit 41 by a preset distance or a position behind the focal point by a preset distance.

[0048] The focusing unit 41 is used to convert each single-wavelength input light from large-spot parallel light into focused light, and the collimation unit 42 is used to convert each single-wavelength input light from focused light into small-spot parallel light, so that each single-wavelength input light is incident on the corresponding position of the micro-electro-mechanical reflective assembly 5 in the form of small-spot parallel light.

[0049] In an alternative embodiment, when the collimating unit 42 is arranged at a preset distance in front of the focal point of the focusing unit 41, the collimating unit 42 is a concave lens, as shown in Figure 2 When the collimating unit 42 is arranged at a preset distance behind the focal point of the focusing unit 41, the collimating unit 42 is a convex lens, as shown in Figure 3 , Figure 4 and Figure 5 The front and back of the focal point are relative to the focusing unit 41 itself, that is, the position closer to the focusing unit 41 is called the front of the focal point, and the position farther away from the focusing unit 41 is called the back of the focal point.

[0050] The preset distance is determined by the size of the mirror of the micro-electro-mechanical reflective component 5. Specifically, the preset distance is determined by the size of the mirror by those skilled in the art, so that at the preset distance, the single-wavelength input light can be focused to a small enough spot, so that the small spot parallel light can completely fall on the mirror. When the collimating unit 42 is arranged at the focal point of the focusing unit 41, each single-wavelength input light is converged to a point, which is difficult to distinguish, so by arranging the collimating unit 42 in front of or behind the focal point of the focusing unit 41, the independence of each single-wavelength input light is maintained while focusing each single-wavelength input light.

[0051] The angle difference between the normal line of the mirror of the micro-electro-mechanical reflective component 5 and the optical axis of the collimating assembly 2 is within a preset angle range. The preset angle range is obtained by experienced analysis by those skilled in the art, so that the single-wavelength reflected light after tuning and filtering can reach the collimating assembly 2.

[0052] In an alternative embodiment, the optical fiber array assembly 1 is provided with one input port and three output ports; the three output ports are respectively used to output first, second and third single-wavelength reflected light. The multi-wavelength input light includes one or more of the first, second and third wavelengths; wherein the first, second and third wavelengths are in the C band and / or L band. And the input port of the optical fiber array assembly 1 and each output port of the optical fiber array assembly 1 are located on the same side. As shown in Figure 3 , Figure 4 and Figure 5 For different single-wavelength reflected light, finally output from different output ports of the optical fiber array assembly 1, assuming that there are three single-wavelength reflected light, according to the wavelength relationship between the three single-wavelength reflected light, they are called intermediate waveband, short waveband and long waveband respectively, as shown in Figure 3As shown, the middle wave band is output from the middle output port of the fiber array assembly 1, and the short wave band and the long wave band are output from the output ports on the two sides of the fiber array assembly 1 respectively.

[0053] In a specific application scenario, the focusing unit 41, the collimating unit 42 and the collimating assembly 2 are all lenses, such as flat convex lenses, the convex surface of the collimating assembly 2 faces the fiber array assembly 1, the convex surface of the focusing unit 41 faces the collimating unit 42, the convex surface of the collimating unit 42 faces the focusing unit 41, the grating assembly 3 is a grating, and the fiber array assembly 1 is a fiber array.

[0054] It should be noted that, Figures 1-5 Each fiber array assembly 1 in the figure is shown in the cross section of the fiber array assembly 1 for the purpose of clarity, and does not represent the actual arrangement direction or actual shape of the fiber array assembly 1 in actual use.

[0055] Embodiment 2:

[0056] Based on the embodiment 1, the embodiment further provides an optical performance monitoring module, as shown in Figure 6 As shown, the optical performance monitoring module comprises a plurality of detection assemblies and the grating type wide wave tunable filter described in the embodiment 1, each detection assembly is arranged at the output port of the grating type wide wave tunable filter, and is used for converting each single wave output light into an electrical signal for optical performance monitoring. In an actual application scenario, the detection assembly is a photodetector.

[0057] The utility model also combines specific application scene, and by the technical expression under related scene to elaborate the implementation process under the characteristic scene of the utility model.

[0058] The optical performance monitoring module provided by the embodiment comprises a fiber array assembly 1, a collimating assembly 2, a grating assembly 3, a focusing unit 41, a collimating unit 42, a micro-electro-mechanical reflection assembly 5, a first photodetector, a second photodetector and a third photodetector (i.e. each detection assembly), as shown in Figure 3 and Figure 6 In actual use, the fiber array assembly 1 can be a fiber array, the grating assembly 3 can be a grating, and the micro-electro-mechanical reflection assembly 5 can be a micro-electro-mechanical system with a mirror.

[0059] The fiber array assembly 1 is used for input of a wide wave range light source and output of filtered light signals.

[0060] The collimating assembly 2 is an optical element made of transparent material, which is used for converting the divergent light output by the fiber array assembly 1 into parallel light.

[0061] The grating assembly 3 is an optical element using the principle of multi-slit diffraction to disperse light, which is used to decompose the input parallel light of wide wavelength range into parallel light of different wavelengths according to different diffraction angles.

[0062] The focusing unit 41 is the same as the collimating assembly 2, which is used to focus the input parallel light of each wavelength at different positions. The collimating unit 42 is an optical element made of transparent material, which converts the focused light into parallel light, and together with the focusing unit 41, it constitutes a telescope system to convert a large spot into a small spot.

[0063] The micro-electro-mechanical system reflecting assembly 5 is used to reflect the diffracted light of a specific wavelength back to the optical path.

[0064] The first photodetector, the second photodetector and the third photodetector are all semiconductor chip devices composed of PN junction, which are used to receive the light signal of a specific wavelength and convert the received optical power into electric current, also known as photodiode.

[0065] The output divergent light of the fiber array assembly 1 receives the return light. The divergent light output by the fiber array assembly 1 is converted into parallel light by the collimating assembly 2.

[0066] The parallel light output by the collimating assembly 2 is incident on the grating assembly 3, which decomposes the input parallel light of wide wavelength range into parallel light of different wavelengths according to different diffraction angles. The parallel light of different wavelengths decomposed by the grating assembly 3 is reconverted into parallel focused light of different angles by the focusing unit 41 and the collimating unit 42.

[0067] The parallel light of different angles output by the collimating unit 42 is incident on the mirror of the micro-electro-mechanical system.

[0068] The mirror of the micro-electro-mechanical system reflects the incident light. The rotation angle of the mirror can be tuned, and only the parallel light of a specific wavelength is reflected back to the optical path, as shown in Figure 3 、 Figure 4 and Figure 5 The return light is received by the optical fibers of the fiber array assembly 1 respectively.

[0069] The specific wavelength of light reflected by the micro-electro-mechanical system changes with the rotation of the mirror surface. The light of different angles is received by the optical fibers of the fiber array assembly 1 respectively. The return light received by the fiber array assembly 1 can cover the C+L band.

[0070] The mirror of the micro-electro-mechanical system reflects the incident light. The rotation angle of the mirror can be tuned, and only the parallel light of a specific wavelength is reflected back to the optical path, which is received by the first photodetector, the second photodetector and the third photodetector connected by the fiber array assembly 1 respectively and converted into electric signal.

[0071] The first photodetector, the second photodetector and the third photodetector receive the returned light to be converted into electric signals, which can be restored into a spectrum by processing of the circuit to realize C+L filtering.

[0072] The embodiment realizes C+L band tunable optical filtering and optical performance monitoring through optical fibers, lenses, gratings, micro-electro-mechanical systems, photodiodes and the like, and has the characteristics of simple process, narrow linewidth, simultaneous filtering and monitoring of C+L band and the like.

[0073] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A grating type wide-wave tunable filter characterized by, The optical fiber array assembly (1), the collimation assembly (2), the grating assembly (3), the focusing assembly (4) and the micro-electro-mechanical reflection assembly (5) are coupled in sequence along an optical path. The optical fiber array assembly (1) is configured to receive multi-wavelength input light from an input port and transmit the multi-wavelength input light to the collimation assembly (2). The collimation assembly (2) is configured to convert the multi-wavelength input light from divergent light into parallel light and make the multi-wavelength input light incident on the grating assembly (3) in parallel. The grating assembly (3) is configured to split the multi-wavelength input light to obtain single-wavelength input light of different wavelengths. The focusing assembly (4) is configured to focus each single-wavelength input light to different positions of the micro-electro-mechanical reflection assembly (5). The micro-electro-mechanical reflection assembly (5) is configured to tune filter each single-wavelength input light to obtain single-wavelength reflection light, and make the single-wavelength reflection light sequentially pass through the focusing assembly (4), the grating assembly (3) and the collimation assembly (2) to different output ports of the optical fiber array assembly (1) for output. The focusing assembly (4) comprises a focusing unit (41) and a collimation unit (42).

2. The grating type wide-wave tunable filter according to claim 1, wherein The collimation unit (42) is arranged at a preset distance in front of or behind the focal point of the focusing unit (41). The focusing unit (41) is configured to convert each single-wavelength input light from large-spot parallel light into focused light, and the collimation unit (42) is configured to convert each single-wavelength input light from focused light into small-spot parallel light, so that each single-wavelength input light is incident on the corresponding position of the micro-electro-mechanical reflection assembly (5) in the form of small-spot parallel light. When the collimation unit (42) is arranged at a preset distance in front of the focal point of the focusing unit (41), the collimation unit (42) is a concave lens.

3. The grating type wide-wave tunable filter according to claim 2, wherein When the collimation unit (42) is arranged at a preset distance behind the focal point of the focusing unit (41), the collimation unit (42) is a convex lens.

4. The grating type wide-wave tunable filter according to claim 2, wherein The angle difference between the normal line of the mirror of the micro-electro-mechanical reflection assembly (5) and the optical axis of the collimation assembly (2) is within a preset angle range.

5. The grating type wide-wave tunable filter according to claim 2, wherein The micro-electro-mechanical reflection assembly (5) is a micro-electro-mechanical system with a mirror.

6. The grating type wide-wave tunable filter according to claim 1, wherein The optical fiber array assembly (1) is provided with one input port and three output ports.

7. The grating type wide-wave tunable filter according to claim 1, wherein The three output ports are respectively configured to output first single-wavelength reflection light, second single-wavelength reflection light and third single-wavelength reflection light. The multi-wavelength input light comprises one or more of a first wavelength, a second wavelength and a third wavelength; wherein the first wavelength, the second wavelength and the third wavelength are located in a C band and / or an L band.

8. The grating type wide-wave tunable filter according to claim 7, wherein The grating type wide-wave tunable filter comprises a plurality of detection assemblies and the grating type wide-wave tunable filter of any one of claims 1-8.

9. An optical performance monitoring module, characterized by Each detection assembly is arranged at an output port of the grating type wide-wave tunable filter and is configured to convert each single-wavelength output light into an electrical signal for optical performance monitoring. The detection assembly is a photodetector.

10. The optical performance monitoring module of claim 9, wherein, ​

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