Miniaturized multi-channel Block optical module based on array optical path

Abstract

The utility model discloses a miniaturized multichannel Block optical module based on an array optical path, which is characterized in that 4N wave signal light is collimated by a collimator and then enters a rhombic prism group through an isolator; the orthorhombic prism group comprises a plurality of orthorhombic prisms and a plurality of triangular prisms which are bonded with each other, the 4N-wave signal light is cut into N beams of 4-wave signal light through the orthorhombic prism group, N is greater than or equal to 4, and the N beams of 4-wave signal light are respectively sent to N incident light ports at the bottom of the array Z-Block; after N beams of 4-wave signal light are divided into 4-N-wave array signal light through array Z-Block wave division, the 4-N-wave array signal light sequentially passes through an array lens and the steering prism and reaches an array PD arranged on the bottom face of the steering prism. According to the utility model, 4N paths of signal light are combined and split through one array Z-Block, the cost is saved, the manufacturing process is reduced, the structure is more compact and miniaturized by utilizing a longitudinal space, the optical path difference between channels is small, the loss is low, the uniformity is good, and the optical power of each channel is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed optical modules, and in particular to a miniaturized multi-channel Block optical module based on an array optical path. Background Art

[0002] With the rapid development of fields like large AI models and Chat GPT, the demand for computing power is increasing, and the demand for high-speed optical modules such as 400G and 800G is growing exponentially. WDM is used in scenarios such as CWDM4, FR4, FR8, LR8, and 2FR4 high-speed optical modules. Typically, a mux and demux are required for wavelength division multiplexing and demultiplexing. Among various WDM solutions, Z-Block wavelength division multiplexing devices offer lower loss and higher isolation than waveguide or silicon photonic platforms. They can be customized in terms of channel count, size, and optical spot size for different client and data center optical module designs.

[0003] The current 4CH Z-Block has become mature, and 8CH and 16CH Z-Blocks have begun research and development and small-scale production. However, since they are all made into single-layer optical paths, or split into 3 or even more Z-Blocks for wave combining and decomposition, the coupling difficulty of the optical path is increased, resulting in large losses and excessive insertion loss uniformity between channels. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide a miniaturized multi-channel Block optical module based on an array optical path in response to the defects in the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The utility model provides a miniaturized multi-channel block optical module based on an array optical path. The device includes: an array PD, a steering prism, an array lens, an array Z-Block, an rhombus prism group, an isolator and a collimator; wherein:

[0007] After being collimated by the collimator, the 4N-wave signal light is incident on the rhombus prism group through the isolator; the rhombus prism group includes a plurality of rhombus prisms and a plurality of triangular prisms bonded to each other. After the 4N-wave signal light is cut into N beams of 4-wave signal light by the rhombus prism group, N ≥ 4, the beams are respectively sent into the N incident light ports at the bottom of the array Z-Block; after the N beams of 4-wave signal light are divided into 4N-wave array signal light by the array Z-Block wave splitting, the beams pass through the array lens and the steering prism in sequence and reach the array PD arranged on the bottom surface of the steering prism.

[0008] Further, the rhombic prism group of the present utility model includes a first triangular prism, a first rhombic prism, a second rhombic prism, a second triangular prism, and a third rhombic prism; the cross-sections of the first rhombic prism, the second rhombic prism, and the third rhombic prism are all parallelograms, and the corresponding sides of different parallelograms are arranged parallel to each other; the first rhombic prism and the second rhombic prism are respectively arranged on both sides of the first triangular prism and form a first isosceles trapezoid; the third rhombic prism is arranged on one side of the second triangular prism and forms a second isosceles trapezoid.

[0009] Further, the rhombic prism group of the present utility model further includes a fourth rhombic prism, and the fourth rhombic prism is arranged on one side of the first rhombic prism, so that the rhombic prism group forms a large isosceles trapezoid.

[0010] Further, the collimator of the present utility model includes a C-Lens, a glass tube, and a single fiber head connected in sequence; the 16-wave signal light is incident from one end of the single fiber head and exits from one end of the C-Lens.

[0011] Further, the array Z-Block of the present utility model includes a filter and an array prism Block; N incident light ports are provided at the bottom of the incident end of the array prism Block; 4N filters are provided and are respectively arranged at the exit end of the array prism Block; an antireflection film for signal light input is plated on the surface of the incident light ports at the incident end of the array prism Block, and a high-reflection film for signal light reflection is plated inside the array prism Block.

[0012] Further, one side of the array lens of the present utility model is a plane, and 4N convex lenses are provided on the other side. An antireflection film is plated on the convex lenses, and the 4N convex lenses respectively correspond to the 4N filters one by one.

[0013] Further, the steering prism of the present utility model includes at least three surfaces: an incident surface, a reflection surface, and an exit surface, where: the reflection surface is an inclined surface with an inclined surface angle of 45°; the incident surface is fitted with the plane of the array lens; the exit surface is parallel to the array PD.

[0014] Further, the incident surface of the steering prism of the present utility model is not coated, and the exit surface is coated with an antireflection film.

[0015] Further, the device of the present utility model further includes a ceramic substrate, and the steering prism, the array lens, the array Z-Block, the rhombic prism group, the isolator, and the collimator are all arranged on the ceramic substrate.

[0016] Furthermore, the device of the present invention further comprises an LC connector, and the LC connector is connected to the collimator via an optical fiber.

[0017] The beneficial effects produced by the utility model are:

[0018] 1. The present invention utilizes a rhombus prism array consisting of multiple rhombus prisms and triangular prisms, and an array Z-Block to evenly arrange 4N wave signal lights in the longitudinal direction, achieving an N×4 arrangement of wave combining and splitting, reducing the optical path difference of the optical signals in each channel. Compared with the existing technology, the present invention has a simple structure and a smaller size.

[0019] 2. The utility model can achieve higher transmission rate and improve the transmission capacity;

[0020] 3. The utility model fully utilizes the unused longitudinal space in the optical module housing to improve the integration;

[0021] 4. This invention saves costs and reduces the production process. It makes use of the longitudinal space to make the structure more compact and miniaturized. The optical path difference between each channel is small, the loss is low, the uniformity is good, the optical power of each channel is more stable, and the signal transmission effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0023] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the present utility model;

[0024] Figure 2 This is a partial view of the rhombic prism assembly, isolator and collimator of Example 1 of the present utility model

[0025] Figure 3 This is a partial diagram of the filter and array prism Block of Example 1 of the present utility model;

[0026] Figure 4 This is a partial diagram of the array lens of Example 1 of the present utility model;

[0027] Figure 5 This is a partial diagram of the array PD and the turning prism of Example 1 of the present utility model;

[0028] Figure 6 This is the light spot distribution diagram of Example 1 of the utility model;

[0029] Figure 7 It is a side view of embodiment 1 of the present utility model;

[0030] Figure 8 It is a top view of Example 1 of the utility model;

[0031] Figure 9 is the overall structural schematic diagram of Embodiment 2 of the present utility model;

[0032] Figure 10 is the top view of Embodiment 2 of the present utility model. Detailed implementation manners

[0033] In order to make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0034] The present invention provides an optical module of a miniaturized multi-channel Block based on an array optical path. The device includes: an array PD, a steering prism, an array lens, an array Z-Block, a rhomboid prism group, an isolator and a collimator; wherein:

[0035] After the 4N-wave signal light is collimated by the collimator, it is incident on the rhomboid prism group through the isolator; the rhomboid prism group includes a plurality of rhomboid prisms and a plurality of triangular prisms bonded to each other. After the 4N-wave signal light is split into N beams of 4-wave signal light by the rhomboid prism group, N≥4, they are respectively sent to N incident light ports at the bottom of the array Z-Block; after the N beams of 4-wave signal light are divided into 4N-wave array signal light by wavelength division through the array Z-Block, they respectively pass through the array lens and the steering prism in sequence, and reach the array PD arranged on the bottom surface of the steering prism.

[0036] The following shows, through two embodiments, the setting methods of the optical module of the miniaturized multi-channel Block based on the array optical path in the cases of N = 4 and N = 5 respectively, and the cases of other N = 6, 7, 8..... are not elaborated. Among them, N = 4 in Embodiment 1 and N = 5 in Embodiment 2.

[0037] Embodiment 1

[0038] Such as Figure 1 、 Figure 7 and Figure 8As shown in the figure, in the optical module of a miniaturized multi-channel Block based on an array optical path according to an embodiment of the present invention, when N = 4, through a pre-splitting rhomboid prism group, 16-channel signal light is evenly split into 4 parts. The rhomboid prism group 6 is composed of three rhomboid prisms and two triangular prisms bonded together. Four beams of 4-channel signal light are incident from 4 optical ports of the array Z-Block at a set Pitch X respectively. The transverse Pitch X of the array optical signal is determined by the transverse width of the rhomboid prism. Then, the four beams of 4-channel signal light are divided into 16-channel array signal light through the array Z-block wavelength division, and reach the array PD1 on the bottom surface through the array lens 3 and the turning prism 2. This is the Demux optical path. The Mux optical path is reversed. Moreover, the rhomboid prism group 6 used in Mux can be controlled by an angle to perform multiplexing through total internal reflection, effectively reducing costs.

[0039] The 16-channel signal light of the present invention completes wavelength division multiplexing through an array Z-Block, saving costs and reducing manufacturing processes. The longitudinal space is utilized to make the structure more compact and miniaturized. Moreover, the optical path difference between channels is small, the loss is low, the uniformity is good, and the optical power of each channel is more stable.

[0040] In a preferred embodiment of the present invention, the device includes: an array PD1, a turning prism 2, an array lens 3, an array Z-Block, a rhomboid prism group 6, an isolator 7, and a collimator 8; where:

[0041] The incident light is a beam of 16-channel signal light. After being collimated by the collimator 8, the signal light is incident on the rhomboid prism group 6 through the isolator 7. The rhomboid prism group 6 includes three rhomboid prisms and two triangular prisms bonded to each other. After the 16-channel signal light is split into four beams of 4-channel signal light by the rhomboid prism group 6, they are respectively sent to 4 incident optical ports at the bottom of the array Z-Block. After the four beams of 4-channel signal light are divided into 16-channel array signal light through the wavelength division of the array Z-Block, they sequentially pass through the array lens 3 and the turning prism 2, and reach the array PD1 arranged on the bottom surface of the turning prism 2.

[0042] As Figure 2 shown, the single-fiber collimator 8 is composed of a C-Lens 8-1, a glass tube 8-2, and a single-fiber ferrule 8-3, and outputs a collimated beam of 16-channel signal light, which is incident on the rhomboid prism group 6 after passing through the isolator 7. The isolator 7 is used to isolate the return light reflected back to the collimator 8 and affect the signal transmission.

[0043] The rhombic prism group 6 consists of a first triangular prism 6-1, a first rhombic prism 6-2, a second rhombic prism 6-3, a second triangular prism 6-4 and a third rhombic prism 6-5. The opposite faces of the rhombic prisms are parallel to each other. The beam splitting surfaces of three of the prisms are coated with WDM beam splitting films. The third rhombic prism 6-5 splits the 16-channel signal light into two beams of 8-channel signal light. One beam is transmitted and enters the first rhombic prism 6-2, and the other beam enters the second rhombic prism 6-3 after two reflections. Then, the WDM beam splitting films in the first rhombic prism 6-2 and the second rhombic prism 6-3 split the light beam into four parallel beams of 4-channel signal light, namely λ1~λ4, λ5~λ8, λ9~λ12, and λ13~λ16.

[0044] In a preferred embodiment of the present invention, the rhombic prism group 6 includes a first triangular prism 6-1, a first rhombic prism 6-2, a second rhombic prism 6-3, a second triangular prism 6-4 and a third rhombic prism 6-5; the cross-sections of the first rhombic prism 6-2, the second rhombic prism 6-3 and the third rhombic prism 6-5 are all parallelograms, and the corresponding sides of different parallelograms are arranged parallel to each other; the first rhombic prism 6-2 and the second rhombic prism 6-3 are respectively arranged on both sides of the first triangular prism 6-1 and form a first isosceles trapezoid; the third rhombic prism 6-5 is arranged on one side of the second triangular prism 6-4 and forms a second isosceles trapezoid.

[0045] In a preferred embodiment of the present invention, the beam splitting surfaces of the first rhombic prism 6-2, the second rhombic prism 6-3 and the third rhombic prism 6-5 are coated with WDM beam splitting films; the third rhombic prism 6-5 splits the 16-channel signal light into two beams of 8-channel signal light. One beam is transmitted and enters the first rhombic prism 6-2, and the other beam enters the second rhombic prism 6-3 after two reflections. The WDM beam splitting films of the first rhombic prism 6-2 and the second rhombic prism 6-3 split the light beam into four parallel beams of 4-channel signal light.

[0046] In a preferred embodiment of the present invention, the collimator 8 includes a C-Lens 8-1, a glass tube 8-2 and a single fiber head 8-3 connected in sequence; the 16-channel signal light is incident from one end of the single fiber head 8-3 and exits from one end of the C-Lens 8-1.

[0047] As Figure 3As shown, the Z-Block array is square and can be thought of as four vertical Z-Blocks combined into one. One side is coated, divided into two parts: the lower side is coated with an anti-reflection coating for signal light input, and the upper side is coated with a high-reflection coating for reflecting light beams within the block. The other side is uncoated and has four rows and four columns of filters covering 16 wavelengths. Four parallel beams of four-wavelength signal light enter the clear area of the AR surface at the bottom of the Z-Block array. The Z-Block array then demultiplexes each incoming signal light beam into four separate signal beams, forming a 16-wavelength signal light array.

[0048] In a preferred embodiment of the present invention, the array Z-Block includes a filter 4 and an array prism Block5; four incident light ports are provided at the bottom of the incident end of the array prism Block5; 16 filters 4 are provided, which are respectively arranged at the exit ends of the array prism Block5; the incident light port surface of the incident end of the array prism Block5 is coated with an anti-reflection film for signal light input, and the inside of the array prism Block5 is coated with a high-reflection film for signal light reflection.

[0049] like Figure 4 As shown, the array lens 3 has 4×4=16 lenses, which are formed by molding with a pitch corresponding to the PD. The convex surface is coated with an anti-reflection film to reduce the loss during light beam transmission. The flat surface does not need to be coated. It is attached to the turning prism with a glue matching the refractive index. The array lens is mainly used for focusing the light beam.

[0050] In a preferred embodiment of the present invention, one side of the array lens 3 is a plane, and the other side is provided with 16 convex lenses coated with anti-reflection films. The 16 convex lenses correspond one to one with the 16 filters 4 respectively.

[0051] like Figure 5 As shown, the bevel angle of the turning prism 2 is 45°, the side S1 that is in contact with the array lens 3 is uncoated, and the side S2 that emits light is coated with an anti-reflection film to reduce the loss during optical signal transmission. Its function is to change the direction of the focused 16-wave light beam from horizontal to vertical through total reflection, so that the 16-wave array light beam can be vertically incident on the array PD1 flattened on the bottom plate, and the optical path of each beam of light in the prism is the same; the array PD is used to receive optical signals and realize the conversion of photoelectric signals.

[0052] In a preferred embodiment of the present invention, the turning prism 2 comprises at least three surfaces: an incident surface, a reflective surface, and an exit surface. The reflective surface is inclined at a 45° angle; the incident surface aligns with the plane of the array lens 3; and the exit surface is parallel to the array PD1. The incident surface of the turning prism 2 is uncoated, while the exit surface is antireflection coated.

[0053] In a preferred embodiment of the present utility model, the device further includes a ceramic substrate 9, and the steering prism 2, the array lens 3, the array Z-Block, the rhomboid prism group 6, the isolator 7, and the collimator 8 are all disposed on the ceramic substrate 9.

[0054] In a preferred embodiment of the present utility model, the device further includes an LC connector 10, and the LC connector 10 is connected to the collimator 8 through an optical fiber.

[0055] In a preferred embodiment of the present utility model, the size of the Z-block can be calculated:

[0056] As Figure 6 shown, according to the pitch x×y required for the final 4×4 array optical path, x and y are the Pitch in the horizontal and vertical directions of the array optical path respectively. The horizontal Pitch X of the array optical signal is determined by the horizontal width of the rhomboid prism, and the vertical Pitch Y determines the size of the array demultiplexing Z-Block. Calculate the size of the array demultiplexing Z-Block and the filter spacing. The channel Pitch is d, the incident angle is θ, the refractive index is n, and the Block thickness is T. The calculation formula is as follows:

[0057]

[0058] According to the required spot distribution pitch, the sizes of the rhomboid prism group and the array Z-Block can be determined.

[0059] Demux optical path:

[0060] The 16-channel wavelength division signal light is divided into 4 parallel beams by the rhomboid prism group, and each beam contains the signal light of 4 adjacent wavelengths;

[0061] The prisms in the rhomboid prism group are respectively coated with a filter film and a reflection film to split the signal light and turn the optical path;

[0062] The 4 parallel signal lights respectively enter the AR surface light passing area at the bottom of the array Z-Block, and then the array Z-Block demultiplexes each incident signal light longitudinally into 4 separate signal lights to form a 16-channel signal light array. After being converged by the array lens and turned by the steering prism, it is incident on the 16-channel TIA+PD array for optical reception.

[0063] Mux optical path:

[0064] In the transmitting - side box body, a 4 - column and four - wavelength laser array emits 4×4 = 16 - channel light beams. After passing through the array Z - Block, each column is multiplexed into 1 beam of 4 - wave signal light, with a total of 4 beams. Then, the light beams are turned and combined through a rhomboid prism group, and finally combined into one beam of light for output. After passing through an isolator and a collimator, it enters a single optical fiber for transmission.

[0065] Embodiment 2

[0066] As Figure 9 and Figure 10 As shown, for an optical module of a miniaturized multi - channel Block based on an array optical path in an embodiment of the present utility model, when N = 5, through a pre - splitting rhomboid prism group, 20 - wave signal light is evenly split into 5 parts. The rhomboid prism group 6 is composed of four rhomboid prisms and two triangular prisms bonded together. 5 beams of 4 - wave signal light are incident from 5 optical ports of the array Z - Block with a set Pitch X respectively. The transverse Pitch X of the array optical signal is determined by the transverse width of the rhomboid prism. Then, through the array Z - block for demultiplexing, the 5 beams of 4 - wave signal light are divided into 20 - wave array signal light, and through the array lens 3 and the turning prism 2, it reaches the array PD1 on the bottom surface. This is the Demux optical path, and the Mux optical path is just the reverse. Moreover, the rhomboid prism group 6 used in Mux can be controlled by an angle to perform wave combination through total internal reflection, effectively reducing costs.

[0067] In a preferred embodiment of the present invention, different from Embodiment 1, the rhomboid prism group 6 is composed of a first triangular prism 6 - 1, a first rhomboid prism 6 - 2, a second rhomboid prism 6 - 3, a second triangular prism 6 - 4, a third rhomboid prism 6 - 5, and a fourth rhomboid prism 6 - 6. The opposite faces of the rhomboid prisms are parallel to each other. The 20 - wave signal light is divided into two beams of signal light, 8 - wave and 12 - wave, by the third rhomboid prism 6 - 5. The 8 - wave signal light is divided into two beams of 4 - wave signal light by the second rhomboid prism 6 - 3. The 12 - wave signal light is evenly divided into 3 beams of 4 - wave signal light by the first rhomboid prism 6 - 2 and the fourth rhomboid prism 6 - 6, with a total of 5 beams of 4 - wave signal light. The 5 beams of parallel 4 - wavelength signal light enter the AR - surface light - passing area at the bottom of the 4 - row and 5 - column total 20 - wave array Z - Block, and then through the array Z - Block, each incident signal light is longitudinally demultiplexed into 4 separate signal lights, finally forming a 20 - wave signal light array.

[0068] It should be understood that for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present utility model.

Claims

1. A miniaturized multi-channel optical module based on an array optical path, characterized in that: The optical module comprises: an array PD (1), a steering prism (2), an array lens (3), an array Z-Block, an oblique prism group (6), an isolator (7) and a collimator (8); wherein: After being collimated by the collimator (8), the 4N-wave signal light passes through the isolator (7) and is incident on the rhombus prism group (6); the rhombus prism group (6) comprises a plurality of rhombus prisms and a plurality of triangular prisms bonded to each other. After the 4N-wave signal light passes through the rhombus prism group (6), it is divided into N beams of 4-wave signal light, N ≥ 4, and is respectively sent to the N incident light ports at the bottom of the array Z-Block; after the N beams of 4-wave signal light are divided into 4N-wave array signal light by the array Z-Block, they respectively pass through the array lens (3) and the steering prism (2) in sequence and arrive at the array PD (1) arranged on the bottom surface of the steering prism (2).

2. The miniaturized multi-channel block optical module based on array optical path according to claim 1, characterized in that: The rhombus prism group (6) comprises a first triangular prism (6-1), a first rhombus prism (6-2), a second rhombus prism (6-3), a second triangular prism (6-4) and a third rhombus prism (6-5); the cross-sections of the first rhombus prism (6-2), the second rhombus prism (6-3) and the third rhombus prism (6-5) are all parallelograms, and the corresponding sides of different parallelograms are arranged parallel to each other; the first rhombus prism (6-2) and the second rhombus prism (6-3) are respectively arranged on both sides of the first triangular prism (6-1) and form a first isosceles trapezoid; the third rhombus prism (6-5) is arranged on one side of the second triangular prism (6-4) and forms a second isosceles trapezoid.

3. The miniaturized multi-channel block optical module based on array optical path according to claim 2, characterized in that: The rhombus prism group (6) further comprises a fourth rhombus prism (6-6), and the fourth rhombus prism (6-6) is arranged on one side of the first rhombus prism (6-2), so that the rhombus prism group (6) forms a large isosceles trapezoid.

4. The miniaturized multi-channel block optical module based on array optical path according to claim 1, characterized in that: The collimator (8) comprises a C-Lens (8-1), a glass tube (8-2) and a single fiber head (8-3) connected in sequence; 16-wave signal light is incident from one end of the single fiber head (8-3) and emitted from one end of the C-Lens (8-1).

5. The miniaturized multi-channel block optical module based on array optical path according to claim 1, characterized in that: The array Z-Block comprises a filter (4) and an array prism Block (5); N incident light ports are provided at the bottom of the incident end of the array prism Block (5); 4N filters (4) are provided, which are respectively provided at the exit end of the array prism Block (5); an anti-reflection film for signal light input is plated on the surface of the incident light port at the incident end of the array prism Block (5), and a high-reflection film for signal light reflection is plated inside the array prism Block (5).

6. The miniaturized multi-channel block optical module based on array optical path according to claim 5, characterized in that: One side of the array lens (3) is a plane, and the other side is provided with 4N convex lenses, the convex lenses are coated with anti-reflection films, and the 4N convex lenses correspond one to one with the 4N filters (4).

7. The miniaturized multi-channel block optical module based on array optical path according to claim 6, characterized in that: The turning prism (2) comprises at least three surfaces: an incident surface, a reflecting surface and an exiting surface, wherein: the reflecting surface is an inclined surface with an angle of 45°; the incident surface is aligned with the plane of the array lens (3); and the exiting surface is parallel to the array PD (1).

8. The miniaturized multi-channel block optical module based on array optical path according to claim 7, characterized in that: The incident surface of the turning prism (2) is uncoated, and the exit surface is coated with an anti-reflection film.

9. The miniaturized multi-channel block optical module based on array optical path according to claim 1, characterized in that: The device further comprises a ceramic substrate (9), on which the steering prism (2), the array lens (3), the array Z-Block, the rhombus prism group (6), the isolator (7) and the collimator (8) are all arranged.

10. The miniaturized multi-channel block optical module based on array optical path according to claim 1, characterized in that: The device further comprises an LC connector (10), wherein the LC connector (10) is connected to the collimator (8) via an optical fiber.

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