Multi-wavelength dispersion compensation body etalon

Abstract

The invention provides a multi-wavelength dispersion compensation body etalon, which relates to the technical field of multi-wavelength dispersion compensation and comprises a first polarization beam splitter, a first quarter-wave plate, a second polarization beam splitter, a second quarter-wave plate, a first etalon, a second etalon, a light combination prism, an isolator and a collimator. According to the invention, multiple wavelengths are realized in one assembly at the same time, and are assembled into a module in a free space form; multiple ports are located on the same side, multi-channel and multi-wavelength dispersion compensation is achieved, and placement and design of other elements in the module are facilitated; the product can be placed in parallel in multiple channels, and dispersion compensation of multiple wavelengths with small size and high precision is realized; the light path insertion loss, the light emitting angle and the size are small, matching is convenient, and module assembling production is facilitated; the packaging form can be adjusted according to actual application, and different application scenes in the market are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-wavelength dispersion compensation, and in particular to a multi-wavelength dispersion compensation bulk etalon. BACKGROUND

[0002] In high-speed, long-distance optical fiber communication systems, such as 1.6T, 3.2T and higher-speed optical modules applied in data centers, dispersion is one of the main factors causing optical signal degradation. Dispersion can cause optical pulse broadening, leading to intersymbol interference, which severely limits the transmission distance and system performance. Therefore, effective dispersion compensation technology is the key to realizing high-speed optical communication.

[0003] At present, common dispersion compensation schemes mainly include dispersion compensation fiber (DCF), fiber Bragg grating (FBG), and bulk optical element-based etalons (such as Gires-Tournois interferometer or Fabry-Perot etalon). Among them, the scheme based on bulk etalon has significant advantages in compact optical modules due to its small size, tunability, low loss, and polarization independence (or achieved through design). The unique resonant characteristics of the etalon can provide precise and designed group delay characteristics for specific wavelengths, thereby achieving compensation for the dispersion of specific channels.

[0004] However, with the development of multi-wavelength (such as eight-wavelength, sixteen-wavelength, etc.) parallel transmission technology in optical communication, traditional dispersion compensation schemes face new challenges: 1. Conflict between channel number and volume: If a dispersion compensation module (including etalon, collimator, circulator, etc.) is independently configured for each wavelength channel, it will result in a large system volume, complex structure, high cost, and difficulty in integration into increasingly miniaturized pluggable optical modules (such as QSFP-DD, OSFP).

[0005] 2. Low optical path integration: In existing schemes, multiple independent optical paths require complex spatial arrangement and splicing, and optical path alignment is difficult, resulting in complex assembly process, making it difficult to ensure product consistency and reliability, and low production efficiency.

[0006] 3. Lack of flexibility: Fixed configuration of multi-channel compensation scheme cannot adapt to different wavelength combinations or channel number requirements, lacking modularity and scalability.

[0007] Therefore, there is an urgent need for an integrated solution that can efficiently, compactly and stably compensate for dispersion of multiple wavelengths. SUMMARY

[0008] In order to achieve the above-mentioned objects and other advantages of the present application, the present application provides a multi-wavelength dispersion compensation body etalon, comprising a first polarization beam splitter, a first quarter-wave plate, a second polarization beam splitter, a second quarter-wave plate, a first etalon, a second etalon, a light combining prism, an isolator and a collimator; The first polarization beam splitter defines a first compensation port and a first pass-through port, and the second polarization beam splitter defines a second pass-through port and a second compensation port. The first quarter-wave plate is arranged on a side of the first polarization beam splitter facing the first etalon, and the second quarter-wave plate is arranged on a side of the second polarization beam splitter facing the second etalon. The first etalon is arranged opposite to the first quarter-wave plate to receive light from the first compensation port and reflect the light back to the first polarization beam splitter after dispersion compensation for specific wavelengths. The second etalon is arranged opposite to the second quarter-wave plate to receive light from the second compensation port and reflect the light back to the second polarization beam splitter after dispersion compensation for specific wavelengths. The light combining prism has at least two incident surfaces and an exit surface, and the exit light paths of the first polarization beam splitter and the second polarization beam splitter are coupled into the light combining prism from different incident surfaces, respectively, and output from the exit surface after light combining. The isolator is arranged on the exit light path of the light combining prism. The collimator is arranged on the exit light path of the isolator to output a light beam.

[0009] Further, when light is incident from the first compensation port, the transmission path is as follows: P-polarized light from the first compensation port passes through the first polarization beam splitter and the first quarter-wave plate in sequence to become circularly polarized light, is reflected by the first etalon and returns to the first quarter-wave plate to become S-polarized light, and is then guided by the first polarization beam splitter to the first incident surface of the light combining prism.

[0010] Further, when light is incident from the first pass-through port, the transmission path is as follows: P-polarized light from the first pass-through port passes through the first polarization beam splitter and the first quarter-wave plate in sequence to become circularly polarized light, and directly enters the first incident surface of the light combining prism.

[0011] Further, when light is incident from the second pass-through port, the transmission path is as follows: P-polarized light from the second pass-through port passes through the second polarization beam splitter and the second quarter-wave plate in sequence to become circularly polarized light, and directly enters the second incident surface of the light combining prism.

[0012] Further, when light is incident from the second compensation port, the transmission path of the light is as follows: the P-polarized light of the second compensation port passes through the second polarization beam splitter and the second quarter-wave plate in sequence to become circularly polarized light, is reflected by the second etalon and returns to the second quarter-wave plate to become S-polarized light, and is then guided by the second polarization beam splitter to the second incident surface of the light combining prism.

[0013] Further, the light combining prism comprises at least one reflecting surface inside, which is used to reflect the light entering from the first incident surface to the exit direction and allow the light entering from the second incident surface to be transmitted or reflected to converge with the light reflected by the reflecting surface to form a common exit light beam.

[0014] Further, the number of the reflecting surfaces is two, which are a first reflecting surface and a second reflecting surface.

[0015] Further, the first reflecting surface and the second reflecting surface are both 45° reflecting surfaces.

[0016] Further, the first etalon and the second etalon are Fabry-Perot etalons or Gires-Tournois interferometers designed for different compensation wavelengths.

[0017] Further, the first polarization beam splitter, the first quarter-wave plate, the second polarization beam splitter, the second quarter-wave plate, the first etalon, the second etalon, the light combining prism, the isolator and the collimator are fixed by optical glue and integrated into an integral optical assembly.

[0018] Compared with the prior art, the present application has the following beneficial effects: The present application provides a multi-wavelength dispersion compensation etalon, which realizes multi-wavelength in one component in free space form and is assembled into a module; the multi-ports are located on the same side to realize multi-channel and multi-wavelength dispersion compensation, which is convenient for the placement and design of other elements in the module; the product can be placed in parallel in multiple channels to realize small size and high precision multi-wavelength dispersion compensation; the optical path insertion loss is small, the light emitting angle is small, the size is small, the cooperation is convenient, and the module assembly production is facilitated; the packaging form can be adjusted according to actual application to meet different application scenarios on the market.

[0019] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application and can be implemented according to the content of the description, the following is a preferred embodiment of the present application and the detailed description of the drawings as follows. The specific embodiments of the present application are given in detail by the following examples and their drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] 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 Etameter structure for multi-wavelength dispersion compensators Figure 1 ; Figure 2 Etameter structure for multi-wavelength dispersion compensators Figure 2 ; Figure 3 This is a schematic diagram of a cascaded multi-wavelength dispersion compensator etalon.

[0021] 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 etalon; 106, second etalon; 107, beam combining prism; 108, isolator; 109, collimator. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Example 1 A multi-wavelength dispersion compensator etalon, such as Figures 1-3As shown, it includes a first polarization beam splitter (101), a first quarter-wave plate (102), a second polarization beam splitter (103), a second quarter-wave plate (104), a first etalon (105), a second etalon (106), a beam combining prism (107), an isolator (108), and a collimator (109). The first polarization beam splitter (101) defines a first compensation port (port 1) and a first through port (port 2), and the second polarization beam splitter (103) defines a second through port (port 3) and a second compensation port (port 4). The first quarter-wave plate (102) is disposed on the side of the first polarization beam splitter (101) facing the first etalon (105), and the second quarter-wave plate (104) is disposed on the side of the second polarization beam splitter (103) facing the second etalon (106); The first etalon (105) is positioned opposite to the first quarter-wave plate (102) to receive light from the first compensation port and reflect it back to the first polarization beam splitter (101) after performing dispersion compensation on a specific wavelength. The second etalon (106) is positioned opposite to the second quarter-wave plate (104) to receive light from the second compensation port and reflect it back to the second polarization beam splitter (103) after dispersive compensation for a specific wavelength. The beam combining prism (107) has at least two incident surfaces and one exit surface. The exit optical paths of the first polarization beam splitter (101) and the second polarization beam splitter (103) are coupled into the beam combining prism (107) from different incident surfaces, and are output from the exit surface after beam combining. The isolator (108) is disposed on the outgoing light path of the beam combining prism (107); The collimator (109) is disposed in the output optical path of the isolator (108) for outputting a light beam.

[0027] In this embodiment, polarized light of different wavelengths is input to ports 1, 2, 3, and 4. Ports 1 and 4 undergo dispersion compensation through a standard etalon, and are combined with ports 2 and 3. After being protected by an isolator, the light is coupled into a collimator to achieve dispersion compensation for multi-wavelength light paths.

[0028] Optionally, the first etalon (105) and the second etalon (106) are Fabry-Perot etalons or Gires-Tournois interferometers designed for different compensation wavelengths.

[0029] The beam combining prism (107) contains at least one reflective surface for reflecting light entering from the first incident surface to its exit direction, and allowing light entering from the second incident surface to be transmitted or reflected and then combined with the light reflected by the reflective surface to form a common exit beam. Preferably, there are two reflective surfaces, namely a first reflective surface and a second reflective surface. Further, both the first reflective surface and the second reflective surface are 45° reflective surfaces.

[0030] Continue to refer to Figure 2 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 beam splitter (101). Under the action of the polarization beam splitting medium 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 etalon (105). After the light passes through the etalon 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 and passes through the first quarter-wave plate (102). The light passes through the first polarization beam splitter (101) to the left, and is reflected by the first polarization beam splitter medium film layer in the first polarization beam splitter (101) to the second polarization beam splitter medium film layer. It then passes through the first quarter-wave plate (102) to the right, and 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 45° reflecting surface of the beam combining prism (107) to the second wavelength reflecting surface and then to the right side of the isolator (108). After passing through the isolator, the light enters the collimator (109) and is finally output from the collimator fiber.

[0031] Continue to refer to Figure 2 Port 2 optical path: When light is transmitted from right to left from port 2, when P-polarized light of a 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 transformed into circularly polarized light. After passing through the first 45° reflection surface of the beam combining prism (107) to the second wavelength reflection surface to the right side of the isolator (108), after passing through the isolator to the collimator (109), the light is finally output from the collimator fiber. Continue to refer to Figure 2, Port 3 optical path: When light is transmitted from right to left from port 3, when P-polarized light of a 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 second 45° surface wavelength of the beam combining prism (107), passes through the right side of the isolator (108), passes through the isolator to the collimator (109), and finally the light is output from the collimator fiber.

[0032] Continue to refer to Figure 2 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 splitter 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 then incident on the right incident surface of the second etalon (106). After the light passes through the etalon 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 (106). 4) The light passes through the first polarization beam splitter (103) to the left side of the second polarization beam splitter (103), is reflected by the first polarization beam splitter film, and then passes through the second polarization beam splitter (103) to the right side of the second quarter-wave plate (104). After passing through the second quarter-wave plate (104), the polarization state S light is converted into circularly polarized light and emitted. The light passes through the second 45° surface wavelength of the beam combining prism (107), passes through the right side of the isolator (108), passes through the isolator to the collimator (109), and finally the light is output from the collimator fiber.

[0033] The first polarizing beam splitter (101), the first quarter-wave plate (102), the second polarizing beam splitter (103), the second quarter-wave plate (104), the first etalon (105), the second etalon (106), the beam combining prism (107), the isolator (108), and the collimator (109) are bonded and fixed together by optical adhesive (such as ultraviolet light adhesive) to form an integrated optical component, which 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. It can also be packaged into a box structure for fiber input and output, and spliced ​​with other module structures. In other words, this product can be arranged in parallel with multiple channels to achieve small size and high-precision multi-wavelength dispersion compensation.

[0035] This invention provides a multi-wavelength dispersion compensation etalon, applicable to scenarios requiring single or 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 and high-precision multi-wavelength dispersion compensation; it features minimal optical path insertion loss, a small output angle, and a compact size, facilitating easy assembly and production; the packaging can be adjusted according to actual applications to meet different market demands.

[0036] 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 etalon, characterized in that, It includes a first polarizing beam splitter, a first quarter-wave plate, a second polarizing beam splitter, a second quarter-wave plate, a first etalon, a second etalon, a beam combining prism, an isolator, and a collimator; The first polarization beam splitter defines a first compensation port and a first through port, and the second polarization beam splitter defines a second through port and a second compensation port; The first quarter-wave plate is disposed on the side of the first polarizing beam splitter facing the first etalon, and the second quarter-wave plate is disposed on the side of the second polarizing beam splitter facing the second etalon; The first etalon is positioned opposite the first quarter-wave plate to receive light from the first compensation port and reflect it back to the first polarization beam splitter after performing dispersion compensation on a specific wavelength. The second etalon is positioned opposite the second quarter-wave plate to receive light from the second compensation port and reflect it back to the second polarization beam splitter after performing dispersion compensation on a specific wavelength. The beam combining prism has at least two incident surfaces and one exit surface. The exit optical paths of the first polarizing beam splitter and the second polarizing beam splitter are coupled into the beam combining prism from different incident surfaces, and are output from the exit surface after beam combining. The isolator is disposed in the outgoing light path of the beam combining prism; The collimator is positioned in the output optical path of the isolator and is used to output the light beam.

2. The multi-wavelength dispersion compensator etalon as described in claim 1, characterized in that, When light is incident from the first compensation port, its transmission path is as follows: the P-polarized light from the first compensation port passes through the first polarization beam splitter and the first quarter-wave plate in sequence to become circularly polarized light, is reflected and compensated by the first etalon and returns to the first quarter-wave plate to become S-polarized light, and is then guided by the first polarization beam splitter to the first incident surface of the beam combining prism.

3. A multi-wavelength dispersion compensator etalon as described in claim 1 or 2, characterized in that, When light is incident from the first direct-through port, its transmission path is as follows: the P-polarized light from the first direct-through port passes through the first polarization beam splitter and the first quarter-wave plate in sequence, becomes circularly polarized light, and directly enters the first incident surface of the beam combining prism.

4. The multi-wavelength dispersion compensator etalon as described in claim 1, characterized in that, When light enters through the second through port, its transmission path is as follows: the P-polarized light from the second through port passes through the second polarization beam splitter and the second quarter-wave plate in sequence, becomes circularly polarized light, and directly enters the second incident surface of the beam combining prism.

5. A multi-wavelength dispersion compensator etalon as described in claim 1 or 4, characterized in that, When light is incident from the second compensation port, its transmission path is as follows: the P-polarized light from the second compensation port passes through the second polarization beam splitter and the second quarter-wave plate in sequence to become circularly polarized light. After being reflected and compensated by the second etalon, it returns to the second quarter-wave plate to become S-polarized light, and is then guided by the second polarization beam splitter to the second incident surface of the beam combining prism.

6. The multi-wavelength dispersion compensator etalon as described in claim 1, characterized in that, The beam combining prism contains at least one reflective surface, which is used to reflect light entering from the first incident surface to its exit direction, and allows light entering from the second incident surface to be transmitted or reflected and then merged with the light reflected by the reflective surface to form a common exit beam.

7. The multi-wavelength dispersion compensator etalon as described in claim 6, characterized in that, The number of reflective surfaces is two, namely the first reflective surface and the second reflective surface.

8. The multi-wavelength dispersion compensator etalon as described in claim 7, characterized in that, Both the first and second reflective surfaces are 45° reflective surfaces.

9. The multi-wavelength dispersion compensator etalon as described in claim 1, characterized in that, The first and second etalons are Fabry-Perot etalons or Gires-Tournois interferometers designed for different compensation wavelengths.

10. A multi-wavelength dispersion compensator etalon as described in claim 1, 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 etalon, the second etalon, the beam combining prism, the isolator, and the collimator are bonded together with optical adhesive to form an integrated optical component.

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