Multi-wavelength dispersion compensation volume grating

Abstract

The invention provides a multi-wavelength dispersion compensation volume grating, and relates to the technical field of multi-wavelength dispersion compensation. A second polarization beam splitter; the first quarter-wave plate and the second quarter-wave plate are correspondingly arranged beside the first polarization beam splitter and the second polarization beam splitter respectively; a first volume grating and a second volume grating; the glass block is arranged on one side of the first volume grating, and a reflecting film layer, a total reflection film layer and an antireflection film layer are arranged on the glass block; the plurality of diaphragms are arranged between the glass block and the first volume grating and comprise a first diaphragm, a second diaphragm and a third diaphragm; the isolator and the collimator are sequentially arranged on an emergent light path of the glass block. According to the invention, multiple wavelengths are simultaneously realized in one component and are assembled in the module in a free space form, so that the placement and design of other elements in the module are facilitated, the dispersion compensation of small-size and high-precision multiple wavelengths is realized, the assembly and production of the module are facilitated, and different application scenes in the market can be met.

Description

Technical Field

[0001] This invention relates to the field of multi-wavelength dispersion compensation technology, and in particular to a multi-wavelength dispersion compensation volume grating. Background Technology

[0002] In high-speed optical communication systems, especially as they evolve towards 1.6T, 3.2T, and higher speeds, dispersion (particularly chromatic dispersion) is one of the key factors limiting transmission distance and signal quality. Dispersion in optical fibers causes optical pulses to broaden during transmission, leading to inter-symbol interference and severely reducing the system's bit error rate performance. Therefore, effective dispersion compensation techniques are crucial for achieving long-distance, high-capacity optical communication.

[0003] Traditional dispersion compensation schemes mainly include dispersion-compensating fibers and dispersion compensators based on fiber Bragg gratings. Dispersion-compensating fibers achieve compensation by generating a dispersion value opposite to that of the transmitting fiber through a special refractive index profile design. However, this approach is typically bulky, has high insertion loss, and offers fixed compensation bandwidth and compensation amount, resulting in poor flexibility. In contrast, fiber Bragg gratings and volume gratings, due to their designable dispersion characteristics, lower insertion loss, and compact structure, have become more favored solutions, especially suitable for space-constrained applications such as high-speed optical modules.

[0004] With the increase in system capacity, wavelength division multiplexing (WDM) technology has been widely used, requiring the simultaneous transmission of multiple optical channels with different wavelengths within a single optical fiber. This necessitates that dispersion compensation devices not only compensate for a single wavelength but also compensate and process multiple wavelengths simultaneously and independently, i.e., achieving multi-wavelength dispersion compensation. Common methods for achieving multi-wavelength compensation in existing technologies include: 1) Using multiple independent dispersion compensation modules operating in parallel, with each module processing one wavelength channel. While simple, this method results in a large system size, complex structure, high cost, and difficulties in optical path alignment and stability maintenance between channels, making it hard to integrate into miniaturized optical modules. 2) Using tunable dispersion compensation modules, adjusting grating parameters mechanically or thermally to compensate different wavelengths sequentially. This method cannot achieve simultaneous real-time compensation of multiple wavelengths, has a slow response speed, and faces challenges in system control and reliability, making it unsuitable for scenarios requiring parallel processing of multiple channels.

[0005] Furthermore, after performing dispersion compensation on multiple optical signals, they typically need to be combined into a single output and integrated with components such as optical isolators and collimators to protect the light source and achieve efficient coupling. Existing multi-wavelength combining and compensation hybrid solutions often employ discrete optical components assembled through complex spatial optical paths. This discrete structure not only involves cumbersome assembly processes, extremely high alignment precision requirements, and high production costs, but also makes it difficult to guarantee its mechanical stability and environmental reliability (such as temperature and vibration), failing to meet the increasingly stringent requirements of commercial optical modules for miniaturization, high reliability, and low cost.

[0006] Therefore, there is an urgent need for a solution that can highly integrate functions such as dispersion compensation of multiple wavelengths, optical path selection, multi-wavelength combining, and optical isolation protection into a stable, compact, and easy-to-assemble optical structure, thereby providing a high-performance, highly integrated multi-wavelength dispersion compensation solution for next-generation high-speed optical modules. Summary of the Invention

[0007] To achieve the above-mentioned objectives and other advantages of the present invention, the object of the present invention is to provide a multi-wavelength dispersion compensating volume grating, comprising: First polarization beam splitter; Second polarization beam splitter; First volume grating and second volume grating; A first quarter-wave plate is disposed on the side of the first polarizing beam splitter facing the first volume grating, and a second quarter-wave plate is disposed on the side of the second polarizing beam splitter facing the second volume grating; A glass block is disposed between the first volume grating and the second volume grating, and the glass block is provided with a reflective film layer, a total reflection film layer and an anti-reflection film layer; A plurality of diaphragms are disposed between the glass block and the first quarter-wave plate and the second quarter-wave plate, including a first diaphragm, a second diaphragm and a third diaphragm; And an isolator and a collimator are sequentially arranged in the optical path of the glass block; in, The first polarization beam splitter and the first quarter-wave plate together constitute the first optical path processing unit, which is used to process the input light from the first port and the second port respectively. The second polarization beam splitter and the second quarter-wave plate together constitute the second optical path processing unit, which is used to process the input light from the third port and the fourth port respectively. The first volume grating is used to perform dispersion compensation on light of a specified wavelength from the first port; The second volume grating is used to perform dispersion compensation on light of a specified wavelength from the fourth port; The plurality of diaphragms and the glass block are used to combine and guide the light from the first port, the second port, the third port and the fourth port to the isolator; The isolator is used to provide reverse isolation protection for the combined optical signal; The collimator is used to couple the processed optical signal to the optical fiber.

[0008] Further, the P-polarized light of a specified wavelength from the first port is converted into circularly polarized light after passing through the first polarization beamsplitter and the first quarter-wave plate in sequence, and then incident on the first volume grating for dispersion compensation; the compensated reflected light returns to the first quarter-wave plate along the original path and is converted into S-polarized light. After being reflected by the first polarization beamsplitter, it passes through the first polarization beamsplitter and the first quarter-wave plate in sequence again and is converted into circularly polarized light for output. It then passes through the first diaphragm, the reflective film layer of the glass block, the second diaphragm, the total internal reflection film layer of the glass block, the bandpass film layer of the third diaphragm, and the anti-reflection film layer of the glass block in sequence, and is finally output through the isolator and the collimator.

[0009] Furthermore, the P-polarized light of a specified wavelength from the second port is converted into circularly polarized light after passing through the first polarization beam splitter and the first quarter-wave plate in sequence. It then passes through the first diaphragm, the reflective film of the glass block, the second diaphragm, the total internal reflection film of the glass block, the bandpass film of the third diaphragm, and the anti-reflection film of the glass block in sequence, and is finally output through the isolator and the collimator.

[0010] Furthermore, the P-polarized light of a specified wavelength from the third port is converted into circularly polarized light after passing through the second polarization beam splitter and the second quarter-wave plate in sequence, and then passes through the third diaphragm and the anti-reflection coating of the glass block in sequence, and is finally output through the isolator and the collimator.

[0011] Further, the P-polarized light of a specified wavelength from the fourth port is converted into circularly polarized light after passing through the second polarization beam splitter and the second quarter-wave plate in sequence, and then incident on the second volume grating for dispersion compensation; the compensated reflected light returns to the second quarter-wave plate along the original path and is converted into S-polarized light. After being reflected by the second polarization beam splitter, it passes through the second polarization beam splitter and the second quarter-wave plate in sequence again and is converted into circularly polarized light for output. It then passes through the third diaphragm and the anti-reflection coating of the glass block in sequence, and finally passes through the isolator and the collimator for output.

[0012] Furthermore, the dispersion compensation center wavelengths of the first volume grating and the second volume grating are different, thereby enabling selective dispersion compensation for different wavelength optical signals at different input ports.

[0013] Furthermore, the reflective film, total reflection film, antireflection film, and bandpass film on the glass block, together with the bandpass film on the third film, constitute a multi-wavelength combiner, which combines processed or undispersion compensated optical signals from different ports into one path.

[0014] Furthermore, the first polarization beam splitter, the first quarter-wave plate, the second polarization beam splitter, the second quarter-wave plate, the first volume grating, the second volume grating, the first diaphragm, the second diaphragm, the third diaphragm, the glass block, the isolator, and the collimator are bonded together with optical adhesive to form a compact optical module.

[0015] Furthermore, the integrated optical module is encapsulated in a box structure, with its input being fiber optic signals from the first port, the second port, the third port, and the fourth port, and its output being a single-fiber signal from the collimator.

[0016] Furthermore, the multi-wavelength dispersion compensator grating can be cascaded or expanded in a parallel arrangement of multiple channels to achieve dispersion compensation and combining of optical signals with more wavelength channels.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention provides a multi-wavelength dispersion compensator grating, which realizes multiple wavelengths simultaneously in a single component and is assembled into a module in a free-space manner. Multiple ports are located on the same side, enabling multi-channel, multi-wavelength dispersion compensation, facilitating the placement and design of other components within the module. The product can be arranged in parallel with multiple channels to achieve small-size, high-precision multi-wavelength dispersion compensation. It features minimal optical path insertion loss, a small output angle, and convenient assembly, facilitating module production. The packaging form can be adjusted according to actual applications to meet different application scenarios in the market.

[0018] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 Diagram of a multi-wavelength dispersion compensator grating structure; Figure 2 This is a schematic diagram of a cascaded multi-wavelength dispersion compensator grating.

[0020] In the figure: 101, first polarization beam splitter; 102, first quarter-wave plate; 103, second polarization beam splitter; 104, second quarter-wave plate; 105, first volume grating; 106, second volume grating; 107, first diaphragm; 108, second diaphragm; 109, third diaphragm; 110, glass block; 111, isolator; 112, collimator. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the accompanying drawings, shapes and dimensions may be enlarged for clarity, and the same reference numerals will be used in all figures to indicate the same or similar parts.

[0023] In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, and lower are defined relative to the structure shown in the accompanying drawings. In particular, "height" corresponds to the dimension from top to bottom, "width" corresponds to the dimension from left to right, and "depth" corresponds to the dimension from front to back. These are relative concepts and may vary depending on their location and usage. Therefore, these or other orientations should not be interpreted as restrictive terms.

[0024] Terms involving attachment, connection, etc. (e.g., “connection” and “attachment”) refer to the relationship in which these structures are directly or indirectly fixed or attached to each other through an intermediate structure, as well as movable or rigid attachments or relationships, unless otherwise explicitly stated.

[0025] Example 1 A multi-wavelength dispersion compensator grating, such as Figure 1 , Figure 2 As shown, it includes: First polarization beam splitter (101); Second polarization beam splitter (103); First volume grating (105) and second volume grating (106); A first quarter-wave plate (102) is disposed on the side of the first polarizing beam splitter (101) facing the first volume grating (105), and a second quarter-wave plate (104) is disposed on the side of the second polarizing beam splitter (103) facing the second volume grating (106). A glass block (110) is disposed between the first body grating (105) and the second body grating (106), and the glass block (110) is provided with a reflective film, a total reflection film and an anti-reflection film; A plurality of diaphragms are disposed between the glass block (110) and the first quarter-wave plate (102) and the second quarter-wave plate (104), including a first diaphragm (107), a second diaphragm (108) and a third diaphragm (109). And an isolator (111) and a collimator (112) are sequentially arranged in the optical path of the glass block (110). in, The first polarization beam splitter (101) and the first quarter-wave plate (102) together constitute the first optical path processing unit, which is used to process the input light from the first port (port 1) and the second port (port 2); The second polarization beam splitter (103) and the second quarter-wave plate (104) together constitute the second optical path processing unit, which is used to process the input light from the third port (port 3) and the fourth port (port 4); The first volume grating (105) is used to perform dispersion compensation on light of a specified wavelength from the first port (port 1); The second volume grating (106) is used to perform dispersion compensation on light of a specified wavelength from the fourth port (port 4); The plurality of diaphragms (107, 108, 109) and the glass block (110) are used to combine and guide the light from the first port, the second port, the third port and the fourth port to the isolator (111). The isolator (111) is used to provide reverse isolation protection for the combined optical signal; The collimator (112) is used to couple the processed optical signal to the optical fiber.

[0026] In this embodiment, ports 1, 2, 3, and 4 transmit polarized light of different wavelengths. Ports 1 and 4 undergo dispersion compensation through a volume grating, are combined with ports 2 and 3, and then coupled into a collimator after being protected by an isolator, thereby achieving dispersion compensation for multi-wavelength optical paths.

[0027] The first volume grating (105) and the second volume grating (106) have different dispersion compensation center wavelengths, thereby selectively compensating for different wavelength optical signals at different input ports.

[0028] The reflective film, total reflection film, and antireflection film on the glass block (110) and the bandpass film on the third film (109) together constitute a multi-wavelength combiner, which combines processed or undispersion compensated optical signals from different ports into one path.

[0029] Continue to refer to Figure 1 Port 1 optical path: When P-polarized light of a specified wavelength is transmitted from right to left through port 1, the P-polarized light is incident on the right side of the first polarization beamsplitter (101). Under the action of the polarization beamsplitter (PBS) film, the polarization state remains unchanged. After passing through the first quarter-wave plate (102), the P-polarized light is converted into circularly polarized light. The circularly polarized light is then incident on the right incident surface of the first volume grating (105). After the light passes through the volume grating for dispersion compensation of the specified wavelength, it is reflected to the left side of the first quarter-wave plate (102). The circularly polarized light is converted into S-polarized light (i.e., S-polarized light). It passes through the first quarter-wave plate (102) to the left side of the first polarization beamsplitter (101). After passing through the first polarization beam splitter in the first polarization beamsplitter (101), the light is incident on the left side of the first polarization beamsplitter (101). The light is reflected from the first polarization beam splitter (101) to the right side of the first quarter-wave plate (102). After passing through the first quarter-wave plate (102), the S-polarized light is converted into circularly polarized light and emitted. The light passes through the first membrane (107) and is incident on the right side of the glass block (110). The light is reflected by the reflective membrane on the left side of the glass block (110) to the left side of the second membrane (108). The light is totally reflected to the left side of the glass block (110). The totally reflected membrane on the left side of the glass block (110) is reflected to the left side of the bandpass membrane on the left side of the third membrane (109). The light of the specified wavelength is reflected to the antireflection membrane on the left side of the glass block (110). The light passes through to the right side of the isolator (111), passes through the isolator to the collimator (112), and finally the light is output from the collimator fiber.

[0030] Continue to refer to Figure 1 Port 2 optical path: When light is transmitted from right to left from port 2, the P-polarized light of the specified wavelength is transmitted from right to left from port 2. The P-polarized light is incident on the right side of the first polarization beam splitter (101). Under the action of the polarization beam splitter film, the polarization state remains unchanged. After passing through the first quarter-wave plate (102), the polarization state P light is converted into circularly polarized light. The light passes through the first film (107) and is incident on the right side of the glass block (110). It is reflected by the left side of the glass block (110) to the left side of the second film (108). It is totally reflected to the left side of the second film (108). The totally reflected film is reflected to the left side of the third film (109). The light of the specified wavelength is reflected to the left side of the anti-reflection film of the glass block (110). The light passes through to the right side of the isolator (111), passes through the isolator to the collimator (112), and finally the light is output from the collimator fiber.

[0031] Continue to refer to Figure 1Port 3 optical path: When light is transmitted from right to left from port 3, the P-polarized light of the specified wavelength is transmitted from right to left from port 3. The P-polarized light is incident on the right side of the second polarization beam splitter (103). Under the action of the polarization beam splitter film, the polarization state remains unchanged. After passing through the second quarter-wave plate (104), the polarization state P light is transformed into circularly polarized light. The light passes through the third film (109) and is incident on the right side of the glass block (110) at the anti-reflection film position on the left side of the glass block (110). The light passes through to the right side of the isolator (111), passes through the isolator to the collimator (112), and finally the light is output from the collimator fiber.

[0032] Continue to refer to Figure 1 Port 4 optical path: When P-polarized light of a specified wavelength is transmitted from right to left through port 4, the P-polarized light is incident on the right side of the second polarization beam splitter (103). Under the action of the polarization beam splitting medium film, the polarization state remains unchanged. After passing through the second quarter-wave plate (104), the P-polarized light is converted into circularly polarized light. The circularly polarized light is incident on the right incident surface of the second volume grating (106). After the light passes through the volume grating for dispersion compensation of the specified wavelength, it is reflected to the left side of the second quarter-wave plate (104). The circularly polarized light is converted into S-polarized light and passes through the second quarter-wave plate (104) to the second The light passes through the first polarization beam splitter film layer in the second polarization beam splitter (103) to the second polarization beam splitter film layer, and then passes through the second quarter-wave plate (104) to the right side from the left side of the second polarization beam splitter (103). After passing through the second quarter-wave plate (104), the polarized S-state light is converted into circularly polarized light and emitted. The light passes through the third film (109), to the right side of the glass block (110) to the left side of the anti-reflection film, and then passes through the isolator (111) to the right side. After passing through the isolator, the light passes through the collimator (112) and finally outputs from the collimator fiber.

[0033] The first polarization beam splitter (101), the first quarter-wave plate (102), the second polarization beam splitter (103), the second quarter-wave plate (104), the first volume grating (105), the second volume grating (106), the first diaphragm (107), the second diaphragm (108), the third diaphragm (109), the glass block (110), the isolator (111), and the collimator (112) are bonded and fixed together by optical adhesive (such as ultraviolet light adhesive), forming a compact optical module that is easy to assemble and has a simple structure.

[0034] The overall structure can be used as a single-fiber multidirectional structure in 1.6T, 3.2T and other high-speed optical modules, or it can be packaged into a box structure to be spliced ​​with other module structures in the form of optical fiber input and output. That is, its input is optical fiber signals from the first port, the second port, the third port and the fourth port, and its output is a single-fiber signal from the collimator (112).

[0035] In summary, this product can be cascaded or expanded by arranging multiple channels in parallel to achieve dispersion compensation and combining of optical signals from more wavelength channels, thus realizing small size and high precision multi-wavelength dispersion compensation.

[0036] This invention provides a multi-wavelength dispersion compensator grating, applicable to scenarios requiring multi-wavelength dispersion compensation such as data centers and communications. The invention achieves multiple wavelengths simultaneously within a single component, assembled into a module in free-space configuration; multiple ports are located on the same side, enabling multi-channel, multi-wavelength dispersion compensation, facilitating the placement and design of other components within the module; the product can be arranged in parallel across multiple channels, achieving small-size, high-precision multi-wavelength dispersion compensation; it minimizes optical path insertion loss, has a small output angle, and is easy to fit, facilitating module assembly and production; the packaging form can be adjusted according to actual applications to meet different market demands.

[0037] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A multi-wavelength dispersion compensator grating, characterized in that, include: First polarization beam splitter; Second polarization beam splitter; First volume grating and second volume grating; A first quarter-wave plate is disposed on the side of the first polarizing beam splitter facing the first volume grating, and a second quarter-wave plate is disposed on the side of the second polarizing beam splitter facing the second volume grating; A glass block is disposed between the first volume grating and the second volume grating, and the glass block is provided with a reflective film layer, a total reflection film layer and an anti-reflection film layer; A plurality of diaphragms are disposed between the glass block and the first quarter-wave plate and the second quarter-wave plate, including a first diaphragm, a second diaphragm and a third diaphragm; And an isolator and a collimator are sequentially arranged in the optical path of the glass block; in, The first polarization beam splitter and the first quarter-wave plate together constitute the first optical path processing unit, which is used to process the input light from the first port and the second port respectively. The second polarization beam splitter and the second quarter-wave plate together constitute the second optical path processing unit, which is used to process the input light from the third port and the fourth port respectively. The first volume grating is used to perform dispersion compensation on light of a specified wavelength from the first port; The second volume grating is used to perform dispersion compensation on light of a specified wavelength from the fourth port; The plurality of diaphragms and the glass block are used to combine and guide the light from the first port, the second port, the third port and the fourth port to the isolator; The isolator is used to provide reverse isolation protection for the combined optical signal; The collimator is used to couple the processed optical signal to the optical fiber.

2. The multi-wavelength dispersion compensator grating as described in claim 1, characterized in that, P-polarized light of a specified wavelength from the first port is converted into circularly polarized light after passing through the first polarization beamsplitter and the first quarter-wave plate in sequence. It is then incident on the first volume grating for dispersion compensation. The compensated reflected light returns to the first quarter-wave plate along the original path and is converted into S-polarized light. After being reflected by the first polarization beamsplitter, it passes through the first polarization beamsplitter and the first quarter-wave plate in sequence again and is converted into circularly polarized light for output. It then passes through the first diaphragm, the reflective film layer of the glass block, the second diaphragm, the total internal reflection film layer of the glass block, the bandpass film layer of the third diaphragm, and the anti-reflection film layer of the glass block in sequence, and is finally output through the isolator and the collimator.

3. The multi-wavelength dispersion compensator grating as described in claim 1, characterized in that, The P-polarized light of a specified wavelength from the second port is converted into circularly polarized light after passing through the first polarization beam splitter and the first quarter-wave plate in sequence. It then passes through the first diaphragm, the reflective film of the glass block, the second diaphragm, the total internal reflection film of the glass block, the bandpass film of the third diaphragm, and the anti-reflection film of the glass block in sequence, and is finally output through the isolator and the collimator.

4. The multi-wavelength dispersion compensator grating as described in claim 1, characterized in that, The P-polarized light of a specified wavelength from the third port is converted into circularly polarized light after passing through the second polarization beam splitter and the second quarter-wave plate in sequence. It then passes through the third diaphragm and the anti-reflection coating of the glass block in sequence, and is finally output through the isolator and the collimator.

5. A multi-wavelength dispersion compensator grating as described in claim 1, characterized in that, P-polarized light of a specified wavelength from the fourth port is converted into circularly polarized light after passing through the second polarization beam splitter and the second quarter-wave plate in sequence, and then incident on the second volume grating for dispersion compensation. The compensated reflected light returns to the second quarter-wave plate along the original path and is converted into S-polarized light. After being reflected by the second polarization beam splitter, it passes through the second polarization beam splitter and the second quarter-wave plate in sequence again and is converted into circularly polarized light for output. It then passes through the third diaphragm and the anti-reflection coating of the glass block in sequence, and finally passes through the isolator and the collimator for output.

6. A multi-wavelength dispersion compensator grating as described in any one of claims 1-5, characterized in that, The first volume grating and the second volume grating have different dispersion compensation center wavelengths, thereby selectively compensating for different wavelength optical signals at different input ports.

7. A multi-wavelength dispersion compensator grating as described in any one of claims 1-5, characterized in that, The reflective film, total reflection film, antireflection film, and bandpass film on the glass block, together with the bandpass film on the third film, constitute a multi-wavelength combiner that combines processed or undispersion compensated optical signals from different ports into one path.

8. A multi-wavelength dispersion compensator grating as described in any one of claims 1-5, characterized in that, The first polarization beam splitter, the first quarter-wave plate, the second polarization beam splitter, the second quarter-wave plate, the first volume grating, the second volume grating, the first diaphragm, the second diaphragm, the third diaphragm, the glass block, the isolator, and the collimator are bonded together with optical adhesive to form a compact optical module.

9. A multi-wavelength dispersion compensator grating as described in claim 8, characterized in that, The integrated optical module is encapsulated in a box structure, with inputs from fiber optic signals from the first port, the second port, the third port, and the fourth port, and outputs a single-fiber signal from the collimator.

10. A multi-wavelength dispersion compensator grating as described in claim 1, characterized in that, The multi-wavelength dispersion compensator grating can be cascaded or expanded in a parallel arrangement of multiple channels to achieve dispersion compensation and combining of optical signals with more wavelength channels.

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