Eight-channel wavelength division multiplexing assembly and assembling method

Abstract

The invention discloses an eight-channel wavelength division multiplexing assembly which comprises a base and an optical fiber head arranged on the base. The first wavelength division multiplexing assembly and the second wavelength division multiplexing assembly are arranged on one side of the optical fiber head, a V-shaped included angle is formed between a high-reflection film on the first wavelength division multiplexing assembly and a high-reflection film on the second wavelength division multiplexing assembly, and an opening of the V-shaped included angle faces the side away from the optical fiber head. The other side, opposite to the high-reflective film, of each of the first wavelength division multiplexing assembly and the second wavelength division multiplexing assembly is provided with a plurality of filters arranged in parallel. The light reflecting part is arranged on the sides, close to the filter, of the first wavelength division multiplexing component and the second wavelength division multiplexing component, is close to a top channel of the first wavelength division multiplexing component and is used for reflecting part of light transmitted and output by the first wavelength division multiplexing component into the second wavelength division multiplexing component; and part of reflected light is output through a filter of the first wavelength division multiplexing assembly. Through the integrated arrangement, the overall size is effectively reduced, the reflection frequency is reduced, and the coupling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wavelength division multiplexing, and in particular to an 8-channel wavelength division multiplexing component and an assembling method thereof. Background Art

[0002] We call this method wavelength division multiplexing (WDM). At the transmitting end, the optical signals of different wavelengths are combined by a multiplexer (MUX) and coupled to the same optical fiber for transmission. At the receiving end, the light of various wavelengths is separated by a demultiplexer (DEMUX), and then further processed by the optical receiver to restore the original signal. Wavelength division multiplexing technology can realize the transmission of multiple wavelength signals on a single optical fiber, which will multiply the transmission capacity of optical fiber and is widely used in data centers and 5G communications. There are two most commonly used demultiplexers in data centers, of which Z-BLOCK and AWG (arrayed waveguide grating) are the two most commonly used and typical MUX / DEMUX subcomponents. Compared with AWG, Z-BLOCK has the advantages of low insertion loss, wide spectral bandwidth, low channel crosstalk, and low temperature sensitivity. It is more widely used in high-speed QSFP and OSFP optical transceivers such as 40G, 100G and 400G.

[0003] The current 8-channel wavelength division multiplexing components rely on two or more levels of wavelength division to combine the composite λ1-λ8 light, pass through multiple groups of prisms to group the light in sequence, and finally output through the prisms to complete multi-level splitting output and realize wavelength division multiplexing. The multi-level prism layered structure makes the overall wavelength division multiplexing component too large and does not meet current needs.

[0004] Therefore, there is still a need for an 8-channel wavelength division multiplexing component and an assembly method thereof to solve the above problems. Summary of the invention

[0005] The present invention provides an 8-channel wavelength division multiplexing component and an assembly method thereof for solving the above problems.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] An 8-channel wavelength division multiplexing component, comprising:

[0008] Base;

[0009] An optical fiber head is arranged on the base;

[0010] A first wavelength division multiplexing component and a second wavelength division multiplexing element are arranged at one side of the optical fiber head, a high reflection mode on the first wavelength division multiplexing element and a high reflection film on the second wavelength division multiplexing element form a V-shaped angle, and an opening of the V-shaped angle faces a side away from the optical fiber head, and a plurality of filters arranged in parallel are arranged on the other side of the first wavelength division multiplexing component and the second wavelength division multiplexing element relative to the high reflection film;

[0011] A reflector is arranged on one side of the first wavelength division multiplexing component and the second wavelength division multiplexing component close to the filter, and the reflector is close to the top channel of the first wavelength division multiplexing component. The reflector is used to reflect part of the light after being transmitted and output by the first wavelength division multiplexing component into the second wavelength division multiplexing component, and output the reflected part of the light through the filter of the first wavelength division multiplexing component.

[0012] In one embodiment, the first wavelength division multiplexing component includes a first beam splitter, a reflector, a plurality of second beam splitters and a prism, wherein the first beam splitter is used to allow part of the light to be transmitted and then emitted onto the reflective element, and to allow part of the light to be reflected and then sequentially reflected by a high-reflection film and a second reflective sheet and then output through the plurality of second beam splitters.

[0013] In one embodiment, the second wavelength division multiplexing component includes a first lens, a plurality of third beam splitters and a prism, wherein the first lens allows light reflected by the reflector to pass through, and then is sequentially reflected by a high reflection mode and then incident into the plurality of third beam splitters for output.

[0014] In one embodiment, a high reflection film is formed between the first beam splitter and the prism, between the second beam splitter and the prism, and between the third beam splitter and the prism.

[0015] In one embodiment, the angle between the light output by the optical fiber head and the output end face of the optical fiber head is 4, 6 or 8 degrees.

[0016] In one embodiment, a collimating lens is further included between the optical fiber head and the first wavelength division multiplexing component.

[0017] A method for assembling an 8-channel wavelength division multiplexing component, comprising:

[0018] Providing a base, and attaching the first wavelength division multiplexing component and the second wavelength division multiplexing component to the surface of the base in sequence;

[0019] and attaching an optical fiber head near the input end of the first wavelength division multiplexing component;

[0020] providing a receiving element at any output end of the second wavelength division multiplexing component;

[0021] The reflector is placed at a preset position on the base, and the position is adjusted so that the light from the receiver reaches a preset threshold.

[0022] In one embodiment, the adjusting position includes:

[0023] First, the reflective element at the preset position is moved in the incident direction of the light path, and the position of the reflective element is moved in sequence until the light of the receiving element reaches a first threshold value;

[0024] The reflective element is then twisted at an angle relative to the optical path output by the first wavelength division multiplexing component until the light from the receiving element reaches a second threshold, and the twisting angle of the receiving element is 1 / 2 of the twisting angle of the reflected light.

[0025] In one embodiment, the method further includes marking the position after determining the position of the reflective element, applying adhesive to the marked position, and attaching the reflective element to the position.

[0026] Compared with the prior art, the beneficial effects of the present invention include at least:

[0027] By arranging the first wavelength division multiplexing component and the second wavelength division multiplexing component in parallel, and arranging a reflective reflector at the output end on the top side of the first wavelength division multiplexing component, under the action of the reflector, the λ5-λ8 output in one channel of the first wavelength division multiplexing component is transmitted, and the integrated setting effectively reduces the overall volume, reduces the number of reflections, and improves the coupling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of 8-channel wavelength division multiplexing according to an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the overall structure of an 8-channel wavelength division multiplexing and a receiving component according to an embodiment of the present invention;

[0030] Figure 3 is a partial structural schematic diagram of an optical fiber head according to an embodiment of the present invention;

[0031] Figure 4 is a schematic structural diagram of a first wavelength division multiplexing component according to an embodiment of the present invention;

[0032] Figure 5 is a schematic structural diagram of a second wavelength division multiplexing component according to an embodiment of the present invention;

[0033] Figure 6 The embodiment of the present invention is used to reflect the relationship between the back intercept of the collimating lens, the working distance and the spot size curve;

[0034] Figure 7 The embodiment of the present invention is used to reflect the relationship between the displacement of the collimating lens and the light output angle curve;

[0035] Figure 8 The embodiment of the present invention is used to reflect the angle of light and the angle curve of the reflector;

[0036] Fig. 9 It is a curve used by the embodiment of the present invention to reflect the position of light and the position of the reflector.

[0037] In the figure: 1. base; 2. optical fiber head; 3. optical fiber; 5. collimating lens; 6. first wavelength division multiplexing component; 61. first beam splitter; 62. reflector; 63. second beam splitter; 7. second wavelength division multiplexing component; 71. first lens; 72. third beam splitter; 8. reflector; 9. filter; 10. high reflection film; 12. prism; 13. filter film. DETAILED DESCRIPTION

[0038] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0039] The words expressing positions and directions described in the present invention are all explained with reference to the accompanying drawings as examples, but they can be changed as needed, and all such changes are included in the protection scope of the present invention.

[0040] Reference Figure 1-5 The present invention provides an 8-channel wavelength division multiplexing component, comprising: a base 1, an optical fiber head 2 arranged on the base 1 and a first wavelength division multiplexing component 6 and a second wavelength division multiplexing component arranged on one side of the optical fiber head 2, a V-shaped angle is formed between the high reflection film 10 on the first wavelength division multiplexing component and the second wavelength division multiplexing component, and the opening of the V-shaped angle faces a side away from the optical fiber head 2, and a plurality of filters 9 arranged in parallel are arranged on the other side of the first wavelength division multiplexing component 6 and the second wavelength division multiplexing component relative to the high reflection film 10.

[0041] The reflector 8 is arranged on the side of the first wavelength division multiplexing component 6 and the second wavelength division multiplexing component close to the filter 9, and the reflector 8 is close to the top channel of the first wavelength division multiplexing component. The reflector 8 is used to reflect part of the light after being transmitted and output by the first wavelength division multiplexing component 6 into the second wavelength division multiplexing component, and output the reflected part of the light through the filter 9 of the first wavelength division multiplexing component 6. During operation, the composite light of λ1-λ8 after the light is emitted through the optical fiber head 2, and λ1-λ4 is emitted after being refracted through the first wavelength division multiplexing component 6, and after being reflected by the reflector 8, it enters the second wavelength division multiplexing component 7, and is reflected by the high reflection film 10 and the filter 9 in the second wavelength division multiplexing component 7 and then output. The first wavelength division multiplexing component 6 and the second wavelength division multiplexing component 7 arranged in parallel are coupled by the reflective coupling of the reflector 8, so that the overall structure is reduced, and the volume of the wavelength division multiplexing component in the output direction of the optical path is reduced. A high degree of integration and avoidance of dispersed multi-level wavelength division can reduce mutual interference between lights of different wavelengths.

[0042] Preferably, the first wavelength division multiplexing component 6 includes a first beam splitter 61, a reflector 62, a plurality of second beam splitters 63 and a prism 12, wherein the first beam splitter 61 is used to allow part of the light to be transmitted and then emitted onto the reflector 8, and to allow part of the light after partial reflection to be reflected by the high-reflection film 10 and the second reflector in turn and then output through the plurality of second beam splitters 63. The first beam splitter 61 is a filter 9, which transmits λ1-λ4 of the input λ1-λ8 composite light through the first beam splitter 61 and outputs it. After reflection, λ5-λ8 are reflected again by the high-reflection film 10, and then reflected by the reflector 62, and then reflected in sequence, and finally outputted from a plurality of second beam splitters 63 with different wavelength filters respectively, and the light λ5-λ8 is outputted as λ5, λ6, λ7, and λ8 in sequence. The first beam splitter 61 and the reflector 62 integrated on the first wavelength division multiplexing group can separate the other λ1-λ4 and reflect them to the second wavelength division multiplexing component through the reflector, thereby reducing the overall manufacturing volume and reducing the mutual interference between lights of different wavelengths.

[0043] Preferably, the second wavelength division multiplexing component 7 includes a first lens 71, a plurality of third beam splitters 72 and a prism 12, wherein the first lens 71 allows the light reflected by the reflector 8 to pass through, and then is reflected in turn by the high reflection mode and then injected into the plurality of third beam splitters 72 and then output. The first lens 71 in the second wavelength division multiplexing component 7 allows the input λ1-λ4 to be transmitted, and then the light is reflected by the high reflection film 10 on the other side of the prism 12, and then is split in turn by the filter 9 with different wavelength filtering effects, and finally output as parallel light of multiple different wavelengths to achieve wavelength division. It has significant performance advantages such as small wavelength variation coefficient with temperature, high passband bandwidth, low insertion loss, and low crosstalk.

[0044] Preferably, a high-reflection film 10 is formed between the first beam splitter 61 and the prism 12, and a filter film 13 is formed between the second beam splitter 63 and the prism 12, and between the third beam splitter 72 and the prism 12. The high-reflection film 10 formed between the first beam splitter 61 and the prism 12 can fully reflect the reflected λ1-λ4 again, so that the reflected light flux can enter the second wavelength division multiplexing component 7 in a stable manner and be reflected and then emitted in wavelength division, thereby realizing the function of wavelength division multiplexing or demultiplexing.

[0045] Preferably, the angle between the light output by the optical fiber head 2 and the output end face of the optical fiber head 2 is 4, 6 or 8 degrees. The optical fiber head 2 plays the role of supporting the optical fiber 3 and positioning the optical fiber 3. The optical fiber head 2 can be a glass optical fiber head 2 or a ceramic optical fiber head 2, and its end face is ground and polished, and the end face grinding angle is 4°, 6° or 8°, so as to improve the return loss performance of the transmitted light.

[0046] The optical fiber head 2 and the first wavelength division multiplexing component 6 also include a collimating lens 5 .

[0047] The present invention also discloses an assembly method of an 8-channel wavelength division multiplexing component, comprising:

[0048] Provide a base 1, and sequentially attach the first wavelength division multiplexing component 6 and the second wavelength division multiplexing component 7 to the surface of the base 1. First, fix the base 1 on a jig or a fixture, and then sequentially fix the first wavelength division multiplexing component 6 and the second wavelength division multiplexing component 7 at the designated positions by gluing or attaching them according to the pre-set positions.

[0049] The optical fiber head 2 is attached to the input end close to the first wavelength division multiplexing component 6. The optical fiber head 2 is also attached to the base 1 according to the preset position.

[0050] A receiving element is provided at any output end of the second wavelength division multiplexing component 7. An optical receiver is attached to one output end of the second wavelength division multiplexing component 7, wherein the receiving range of the optical receiver can cover the output paths of each channel of the entire second wavelength division multiplexing component and the top channel of the first wavelength division multiplexing component. The optical receiver is used to obtain the position and light output angle of the light after the optical fiber output and passing through the first wavelength division multiplexing component 6 and the second wavelength division multiplexing component 7, so as to facilitate the determination of the light coupling condition, with simple operation and high recognition efficiency.

[0051] A receiver is set at the output end of the second wavelength division multiplexing component 6, and the distance from the receiver to the wavelength division multiplexer 61 is fixed. Generally, the distance is set to 50mm from the working position of the collimating lens. Then the collimating lens 5 is placed, and the position of the collimating lens 5 is moved back and forth (the distance from the collimating lens to the optical fiber head is called the back intercept in the optical path calculation). At this time, the spot size of the λ4 wavelength received by the receiver will change with the change of the back intercept of the collimating lens 5, and the change satisfies the following curve 1 coupling curve (curvature R1.419mm, L=1.6mm lens). Stop coupling until the spot size reaches the value we need for design. Moving the lens left and right will change the light output angle of the emitted light in the X (horizontal) direction relative to the main axis, and moving the lens up and down will change the light output angle of the emitted light in the Y (vertical) direction relative to the main axis. The lens position and light output angle meet the following curve 2: collimating lens displacement and light output angle curve (optical fiber head 4° curvature R1.419mm, L=1.6mm lens). In the near optical axis range, the position and angle are approximately linearly related. Move the lens position up and down and left and right respectively until both the X and Y directions meet the design angle requirements, and then apply UV glue to fix the collimating lens 5.

[0052] Place the reflector at the preset position on the base, and adjust the position so that the light of the receiver reaches the third threshold. Attach the reflector 8 to the preset rectangular or circular area on the base 1, and adjust the position of the reflector 8 according to the preset flip angle until the light reflected by the position of the reflector 8 can reach the expected position and light output angle. Record the current position of the reflector, and then mount it with glue.

[0053] Preferably, the angle between the reflective surface of the reflector and the optical path can be determined to be 8 degrees according to a preset value. The adjusting position can specifically include: moving the reflector along the direction of the back intercept until the light signal of the receiving element reaches a second preset threshold, and the light signal is λ1 or λ2 or λ3 or λ4;

[0054] Then move the reflector up and down in a direction perpendicular to the back intercept until the light of the receiving element reaches the third threshold, and determine the mounting position of the reflector. Fig. 9 The relationship between the light output position and the position of the reflector is shown. First, adjust the position of the preset reflector 8 in the direction of light output, that is, in the lateral direction, so that the efficiency of the output light reaches a preset first threshold range, and then record the current position.

[0055] Then move the reflector up and down in a direction perpendicular to the back intercept until the light of the receiver reaches the third threshold. It should be noted that the torsion angle of the receiver is 1 / 2 of the torsion angle of the reflected light. The relationship between the angle torsion of the reflector and the torsion of the light path is as follows: Figure 8Then the reflection is twisted at the above current position, so that the reflected light of the flipped reflector 8 reaches the third threshold, where the range of the third threshold is a subset of the range of the first threshold, until 50-100um is met. This method can conveniently and quickly determine the assembly position of the reflector 8, and assemble an 8-channel wavelength division multiplexing component with a high light output position and angle.

[0056] Preferably, the method further includes marking the position after determining the position of the reflective element, applying adhesive to the marked position, and attaching the reflective element to the position.

[0057] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, substitute and modify the above embodiments within the scope of the invention without departing from the principles and purpose of the present invention. All such changes should fall within the scope of protection of the claims of the present invention.

Claims

1. An 8-channel wavelength division multiplexing component, characterized in that: include: Base; An optical fiber head is arranged on the base; A first wavelength division multiplexing component and a second wavelength division multiplexing element are arranged at one side of the optical fiber head, a high reflection mode on the first wavelength division multiplexing element and a high reflection film on the second wavelength division multiplexing element form a V-shaped angle, and an opening of the V-shaped angle faces a side away from the optical fiber head, and a plurality of filters arranged in parallel are arranged on the other side of the first wavelength division multiplexing component and the second wavelength division multiplexing element relative to the high reflection film; A reflector is arranged on one side of the first wavelength division multiplexing component and the second wavelength division multiplexing component close to the filter, and the reflector is close to the top channel of the first wavelength division multiplexing component. The reflector is used to reflect part of the light after being transmitted and output by the first wavelength division multiplexing component into the second wavelength division multiplexing component, and output the reflected part of the light through the filter of the first wavelength division multiplexing component.

2. The 8-channel wavelength division multiplexing component according to claim 1, characterized in that: The first wavelength division multiplexing component includes a first beam splitter, a reflector, a plurality of second beam splitters and a prism. The first beam splitter is used to allow part of the light to be transmitted and then emitted onto the reflective element, and to allow part of the light to be reflected and then sequentially reflected by a high-reflection film and a second reflector before being output through the plurality of second beam splitters.

3. The 8-channel wavelength division multiplexing component according to claim 2, characterized in that: The second wavelength division multiplexing component includes a first lens, a plurality of third beam splitters and a prism. The first lens allows the light reflected by the reflector to pass through, and the light is sequentially reflected by the high reflection mode and then incident on the plurality of third beam splitters for output.

4. The 8-channel wavelength division multiplexing component according to claim 3, characterized in that: A high reflection film is formed between the first beam splitter and the prism, and a filter film is formed between the second beam splitter and the prism, and between the third beam splitter and the prism.

5. The 8-channel wavelength division multiplexing component according to claim 1, characterized in that: The angle between the light output by the optical fiber head and the output end face of the optical fiber head is 4, 6 or 8 degrees.

6. The 8-channel wavelength division multiplexing component according to claim 5, characterized in that: Also included is a collimating lens located between the optical fiber head and the first wavelength division multiplexing component.

7. A method for assembling an 8-channel wavelength division multiplexing component, characterized in that: include: Providing a base, and attaching the first wavelength division multiplexing component and the second wavelength division multiplexing component to the surface of the base in sequence; and attaching the optical fiber head and the collimator close to the input end of the first wavelength division multiplexing component; A receiving element is arranged at any output end of the second wavelength division multiplexing component, so that the receiving element can receive light from each channel of the second wavelength division multiplexing component and the output of the first wavelength division multiplexing component; The reflective element is placed at a preset position on the base, and the position is adjusted so that the light of the receiving element reaches a third threshold value.

8. The assembly method according to claim 7, characterized in that: The bonded optical fiber head and collimator include: First, place the collimator on the base, define the distance from the collimator lens to the optical fiber head as the back intercept, adjust the length of the back intercept, obtain the composite spot size of λ1-λ4 through the receiving element, and determine the first lateral position when the spot size reaches a first preset value; Then, at the first transverse position, the collimator is moved up and down along a direction perpendicular to the back intercept until a preset light output angle is reached, and a mounting position that fits the collimator is determined.

9. The assembly method according to claim 8, characterized in that: The adjustment position includes: Moving the reflective element along the direction of the back intercept until the light signal of the receiving element reaches a second preset threshold, wherein the light signal is λ1, λ2, λ3 or λ4; Then the reflective element is moved up and down along a direction perpendicular to the back intercept until the light of the receiving element reaches a third threshold value, and the mounting position of the reflective element is determined.

10. The assembly method according to claim 9, characterized in that: The method further comprises marking the position after determining the position of the reflective element, applying adhesive to the marked position, and attaching the reflective element to the position.

Images