Multi-channel optical engine assembly for improving return loss of receiving end of optical module, and optical module

Abstract

A multi-channel optical engine assembly for improving return loss of a receiving end of an optical module, and an optical module. The multi-channel optical engine assembly comprises a wavelength division demultiplexing assembly (3) and a wedge prism (5). The wavelength division demultiplexing assembly (3) is used for demultiplexing a collimated optical signal into at least two light beams. The wedge prism (5) comprises an incident surface (51), a reflecting surface (52), and a transmission surface (53), wherein the incident surface (51) corresponds to the wavelength division demultiplexing assembly (3) and is used for receiving the light beams demultiplexed by the wavelength division demultiplexing assembly (3); the reflecting surface (52) corresponds to the incident surface (51) and the transmission surface (53) and is used for reflecting the light beams received by the incident surface (51) and outputting the light beams by means of the transmission surface (53); and an included angle between the incident surface (51) and the transmission surface (53) is less than 90 degrees. The light emitted from the optical engine assembly can be incident on a receiver (7) at a larger angle, which can not only effectively improve the return loss of a receiving end of an optical module, but also allow reflected light to be closer to a passive part, so as to effectively reduce the interference of stray light on active devices such as TIA chips (8), avoid the problems such as system crosstalk and a bit error caused by the stray light, and reduce the difficulty of free-space coupling.

Description

Multi-channel optical engine components and optical modules for improving return loss at the optical module receiver Technical Field

[0001] This invention relates to the field of optical communication equipment technology, specifically to a multi-channel optical engine component and optical module for improving the return loss at the receiver of an optical module. Background Technology

[0002] Wavelength Division Multiplexing (WDM) is a technique that combines two or more optical carrier signals of different wavelengths (carrying various information) at the transmitting end using a multiplexer (also called a multiplexer, or MUX) and couples them into the same optical fiber for transmission. At the receiving end, the optical carriers of different wavelengths are separated by a demultiplexer (also called a demultiplexer, or DEMUX), and then further processed by an optical receiver to recover the original signal. This technique of simultaneously transmitting two or more different wavelength optical signals in the same optical fiber is called wavelength division multiplexing.

[0003] Multi-channel wavelength division multiplexing (WDM) technology enables the transmission of multiple wavelength signals through a single optical fiber, significantly increasing the fiber's transmission capacity and has been widely applied in modern communications. In optical transceivers, the core optical components for achieving wavelength division multiplexing (MUX) and demultiplexing (DEMUX) are the MUX and DEMUX optical modules. Z-blocks (thin-film filter modules) and AWGs (arrayed waveguide gratings) are two of the most commonly used and typical MUX / DEMUX sub-modules. AWGs are simple to assemble and have good return loss, but they have relatively high insertion loss and isolation; furthermore, due to their divergent light emission, the responsivity balance and response flatness between channels are not ideal. Z-blocks typically consist of a glass block with at least two opposite, polished sides, serving as the input and output ends, respectively, as shown in Figure 1. The front side (input end) of the glass block includes an area coated with an antireflection film and an area coated with a high-reflection film. The rear side (output end) of the glass block includes multiple areas coated with multiple WDM (wavelength division multiplexing) filters of different wavelengths, or areas with multiple filters coated with different wavelength WDM filters. The number of filters is typically four or eight. In use, a collimated beam containing multiple wavelengths enters from the antireflection film at a designed angle. After transmission and reflection through a series of filters, the beam propagates in a Z-shape within the glass block, separating the light signals of different wavelengths, thus achieving DEMUX (dimension-multiplexing) and MUX (multiplexing). Z-blocks have low insertion loss and isolation, are insensitive to temperature, and are the most commonly used wavelength division multiplexing devices. However, free-space systems require more optical components, and coupling is more difficult than with AWG (away from glass).

[0004] With the increasing capacity and speed of communication systems, the impact of device return loss on performance is becoming increasingly severe. Especially in same-wavelength transmission systems, the return loss requirement has increased from the traditional -25dB to over -35dB. However, current Z-Block-based receiver components (commonly referred to as multi-channel optical engine components or wavelength demultiplexing optical receiver components) struggle to meet this return loss requirement. For example, a right-angle prism-based optical receiver component disclosed in Chinese patent CN 209858779 U has an outgoing light angle ranging from 4 to 10 degrees, a relatively small angle, resulting in insufficient return loss. If material tolerances and coupling deviations during production are also considered, the return loss will be even lower, making it even more difficult to meet the return loss requirement. Furthermore, in this prior art, the light emission direction is far from the lens and closer to electronic devices such as TIA chips. In practical applications, a large amount of stray light from primary or secondary reflections will directly hit the TIA chip, causing interference to the TIA chip and other electronic components, which can easily lead to system crosstalk and bit errors, urgently requiring a solution. Summary of the Invention

[0005] The first aspect of this invention addresses the problem of further improving the return loss at the optical module receiver by providing a multi-channel optical engine component. This component not only effectively improves the return loss at the optical module receiver but also helps reduce stray light interference to electronic components such as TIA chips. The main concept is as follows:

[0006] A multi-channel optical engine assembly for improving return loss at the receiver of an optical module includes a wave demultiplexing component and a prism. The wave demultiplexing component is used to demultiplex a collimated optical signal into at least two beams. The prism includes an incident surface, a reflecting surface, and a transmitting surface. The incident surface corresponds to the wave demultiplexing component and is used to receive the beams demultiplexed by the wave demultiplexing component. The reflecting surface corresponds to the incident surface and the transmitting surface and is used to reflect the beams received by the incident surface and output the beams through the transmitting surface. The angle between the incident surface and the transmitting surface is less than 90 degrees. In this scheme, a wave demultiplexing component is configured to demultiplex the collimated optical signal into at least two optical signals. A reflecting surface is configured in the oblique prism, corresponding to both the incident and transmission surfaces. This allows the reflecting surface to reflect the light beam received at the incident surface, and the beam is then output through the transmission surface and enters the receiver, completing the reception of the optical signal. By configuring the angle between the incident and transmission surfaces to be less than 90 degrees, when the incident surface is vertical, the transmission surface is inclined to the horizontal plane. The light beam is output through this inclined transmission surface, allowing the outgoing beam to enter at a larger angle. The light reflected from the receiver is directed to the receiver, allowing it to extend beyond the system's reception range and prevent it from returning to the incident end. This effectively reduces the return loss at the optical module's receiver, meeting the demands of higher-capacity, higher-speed communication systems. Furthermore, the reflected light from the receiver is positioned closer to the passive components and further away from electronic devices like the TIA (Transient Ionizer), significantly reducing the probability of stray light from primary or secondary reflections directly hitting the TIA. This greatly reduces interference with active electronic components like the TIA chip, avoiding system crosstalk and bit errors caused by stray light. Additionally, this design helps reduce the difficulty of free-space coupling.

[0007] Furthermore, the angle between the transmission surface and the incident surface is 80° to 89°. This not only prevents the light reflected from the receiver from exceeding the system's receiving range and returning to the incident end, effectively improving the return loss at the optical module's receiver, but also makes it easier for the reflected light to approach the passive part, avoiding stray light interference with active devices; at the same time, it can also significantly reduce the difficulty of free-space coupling.

[0008] Preferably, the angle between the transmission surface and the incident surface is 85°. This not only allows the return loss of the optical engine assembly to reach over 40dB, which is beneficial for obtaining higher return loss, but also prevents the light from reaching the TIA chip next to the receiver after one or two reflections, effectively avoiding stray light interference with electronic components.

[0009] Furthermore, the angle between the reflecting surface and the incident surface is 40° to 45°. This is more conducive to the light obtaining a larger exit angle at the transmitting surface, which not only helps to further improve return loss, but also helps to avoid stray light interfering with electronic components.

[0010] Preferably, the angle between the reflecting surface and the incident surface is 43°.

[0011] Preferably, the transmission surface is tilted towards the reflecting surface along the direction in which the light beam enters the incident surface. This causes the light beam emitted from the transmission surface to be deflected further away from the electronic components such as the TIA chip on the outside of the receiver, allowing the receiver to be positioned closer to the incident surface. Consequently, the light reflected by the receiver, after passing through the transmission surface and grazing onto the incident surface, cannot be reflected back to the front-end adapter, thus effectively improving the return loss at the optical module receiver.

[0012] The second aspect of this invention addresses the problem of further reducing stray light interference with electronic components such as the TIA (Transmission Interface). Specifically, the angle between the beam emitted from the transmission surface and the vertical direction is 11°–15°. This causes the beam emitted from the transmission surface to be deflected further away from the TIA and other electronic components outside the receiver, allowing the receiver to be positioned closer to the incident surface. Consequently, light reflected from the receiver, after passing through the transmission surface and grazing the incident surface, cannot be reflected back to the front-end adapter, effectively improving the return loss at the optical module receiver, typically reaching over 40dB. Simultaneously, this light will not undergo one or two reflections to reach the TIA chip and other electronic components next to the receiver, avoiding stray light interference with the electronic components.

[0013] Preferably, the wavelength demultiplexing component includes a Z-Block, and the output of the Z-Block has at least two filters or filter films with different operating wavelengths.

[0014] Preferably, the Z-Block is a 4-channel Z-Block or an 8-channel Z-Block.

[0015] Furthermore, it also includes a converging lens array, which is disposed between the wave demultiplexing component and the oblique prism. The beam demultiplexed by the wave demultiplexing component passes through the converging lens array and then enters the incident surface of the oblique prism. The converging lens array is used to converge the beam demultiplexed by the wave demultiplexing component.

[0016] To further address the issue of improving coupling performance, the incident surface of the oblique prism is cemented together with the converging lens array. This effectively reduces the coupling dimension, thereby facilitating a better coupling effect.

[0017] Preferably, the number of channels in the converging lens array is the same as the number of channels in the wave demultiplexing component, so as to ensure mutual matching.

[0018] Furthermore, it also includes a collimator assembly, which corresponds to the wave demultiplexing assembly and is used to transmit the collimated optical signal to the wave demultiplexing assembly.

[0019] Preferably, the collimator assembly includes an optical fiber, an optical fiber head, a collimating lens, and a sleeve. One end of the optical fiber is connected to the optical fiber head. The end of the optical fiber head facing away from the optical fiber is constructed with a first bevel, and the end of the collimating lens facing the optical fiber head is constructed with a second bevel adapted to the first bevel. The optical fiber head and the collimating lens are encapsulated in the same sleeve, and the first bevel corresponds to the second bevel. This can effectively improve return loss and meet the return loss requirements of the collimator assembly.

[0020] Preferably, the inclination angle of the first and second inclined planes is 4° to 11°. This is beneficial for obtaining higher return loss.

[0021] Preferably, the inclination angle of the first and second inclined planes is 8°. This is beneficial for achieving higher return loss.

[0022] Furthermore, it also includes an adapter connected to the collimator assembly.

[0023] Furthermore, it also includes a substrate, on which the wave decomposition and multiplexing component, converging lens array, and collimator component are respectively disposed. This allows the entire multi-channel optical engine component to be formed into a more compact component, which helps to reduce the difficulty of integrating it into a system.

[0024] Preferably, the wave decomposition and multiplexing component, the converging lens array, and the collimator component are all bonded to the substrate. This simplifies the structure and reduces manufacturing complexity.

[0025] An optical module including the multi-channel optical engine component.

[0026] Compared with the prior art, the multi-channel optical engine component and optical module provided by the present invention, which improves the return loss of the optical module receiver, allows the emitted light to be incident on the receiver at a larger angle. This not only effectively improves the return loss of the optical module receiver, but also brings the reflected light closer to the passive part, which can effectively reduce the interference of stray light on active devices such as TIA chips and avoid problems such as system crosstalk and bit errors caused by stray light. In addition, this design also helps to reduce the difficulty of free space coupling. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 is a schematic diagram of an existing Z-Block structure.

[0029] Figure 2 is a front view of a four-channel optical engine component provided in Embodiment 1 of the present invention.

[0030] Figure 3 is a top view of Figure 2.

[0031] Figure 4 is a perspective view of the collimator assembly in a four-channel optical engine assembly provided in Embodiment 1 of the present invention.

[0032] Figure 5 is one of the partial structural diagrams of the oblique prism in Figure 1.

[0033] Figure 6 is a second partial structural schematic diagram of the oblique prism in Figure 1, where the dashed line represents the optical path.

[0034] Figure 7 is a schematic diagram of a four-channel optical engine assembly and a receiver provided in Embodiment 1 of the present invention.

[0035] Figure 8 is a front view of an eight-channel optical engine component provided in Embodiment 2 of the present invention.

[0036] Figure 9 is a top view of Figure 8.

[0037] The markings in the diagram are as follows: Adapter 1; Collimator assembly 2, Fiber 21, Fiber optic head 22, First bevel 221, Collimating lens 23, Second bevel 231, Sleeve 24; Wavelength demultiplexing assembly 3, Z-Block 31, Glass block 32, Antireflective coating 33, High reflectivity coating 34, Filter 35; Converging lens array 4; Angled prism 5, Incident surface 51, Reflecting surface 52, Transmitting surface 53; Substrate 6; Receiver (PD) 7; TIA chip 8. Detailed Implementation

[0038] 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 some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] This embodiment provides a multi-channel optical engine component for improving the return loss of an optical module receiver, including an adapter 1, a collimator component 2, a wave demultiplexing component 3, a prism 5, a converging lens array 4, and a substrate 6. The substrate 6 primarily serves as a load-bearing and supporting element. The collimator component 2, wave demultiplexing component 3, prism 5, and converging lens array 4 can be directly or indirectly disposed on the substrate 6, ensuring that their relative positions remain unchanged during use. For example, as shown in Figures 2 and 3, in this embodiment, the wave demultiplexing component 3, converging lens array 4, and collimator component 2 are respectively disposed on the substrate 6, allowing the entire multi-channel optical engine component to form a more compact assembly, which helps reduce the difficulty of system integration. In a further embodiment, the wave demultiplexing component 3, converging lens array 4, and collimator component 2 can all be glued to the substrate 6 using adhesive, which simplifies the structure and reduces manufacturing complexity.

[0041] In this embodiment, adapter 1 is mainly used to connect external optical fiber 21. In implementation, adapter 1 can be an existing LC socket or LC connector, depending on the actual needs, as shown in Figures 2 and 3.

[0042] In this embodiment, the collimator assembly 2 corresponds to the wavelength demultiplexing assembly 3, as shown in Figures 2 and 3. The collimator assembly 2 is mainly used for collimation and to transmit the collimated optical signal to the wavelength demultiplexing assembly 3. In implementation, the collimator assembly 2 includes an optical fiber 21, an optical fiber head 22, a collimating lens 23, and a sleeve 24, as shown in Figure 4. One end of the optical fiber 21 is connected to the adapter 1, and the other end of the optical fiber 21 is connected to the optical fiber head 22. The optical fiber head 22 and the collimating lens 23 are face-to-face, and the optical fiber head 22 and the collimating lens 23 are encapsulated in the same sleeve 24, as shown in Figure 4. The collimating lens 23 corresponds to the wavelength demultiplexing assembly 3. In use, optical signals of different wavelengths pass through the adapter 1, the optical fiber 21, and the optical fiber head 22, are collimated by the collimating lens 23, and then incident on the wavelength demultiplexing assembly 3. In implementation, the mating surfaces of the fiber optic head 22 and the collimating lens 23 can be constructed as either a plane or an inclined plane. For example, in implementation, the end of the fiber optic head 22 facing away from the fiber optic head 21 can be constructed as a first inclined plane 221, as shown in Figure 4. Simultaneously, the end of the collimating lens 23 facing the fiber optic head 22 can be constructed as a second inclined plane 231 adapted to the first inclined plane 221. During assembly, the first inclined plane 221 corresponds to the second inclined plane 231, as shown in Figure 4. This effectively improves return loss and meets the return loss requirements of the collimator assembly 2. In implementation, the tilt angle of the mating surfaces can be determined according to actual needs. The tilt angles of the first and second inclined planes can preferably be between 4° and 11°, which is beneficial for obtaining higher return loss. For example, the tilt angles of the first and second inclined surfaces can preferably be 6°, 7°, 8°, and 9°. As an example, in this embodiment, the tilt angle of the first inclined surface 221 is 8 degrees, that is, the angle between the normal of the first inclined surface 221 and the axis of the fiber optic head 22 is 8 degrees. At the same time, the tilt angle of the second inclined surface 231 is also 8 degrees, that is, the angle between the normal of the second inclined surface 231 and the axis of the collimating lens 23 is 8 degrees, which is beneficial for the collimator assembly 2 to obtain higher return loss.

[0043] In this embodiment, the wavelength division multiplexing (WDM) component 3 is used to demultiplex the collimated optical signal into at least two beams. In implementation, the WDM component 3 includes a Z-Block 31, as shown in Figures 1 and 3. In this embodiment, the Z-Block 31 includes a glass block 32, which has two opposite, polished sides, serving as the input and output ends, respectively, as shown in Figures 1 and 3. The front side (input end) of the glass block 32 includes an area coated with an antireflection film 33 and an area coated with a high-reflection film 34. The rear side (output end) of the glass block 32 includes multiple areas coated with multiple WDM (wavelength division multiplexing) filters of different wavelengths or areas with multiple filters 35 coated with different wavelength WDM filters, allowing the light beam to propagate in a Z-shape within the glass block 32 to separate optical signals of different wavelengths. In implementation, the number of filter films or filters 35 is typically four or eight to form a four-channel or eight-channel Z-Block 31. For example, in this embodiment, the output end of the Z-Block 31 is provided with four narrowband filters 35 with different operating wavelengths. The narrowband filters 35 are adhered to the glass block 32. Each time the incident light passes through a narrowband filter 35, the wavelengths that meet the requirements are transmitted, while the remaining wavelengths are reflected, thereby achieving demultiplexing of multiple light waves. For example, an incident beam of LWDM4 can be decomposed into 1295.56nm, 1300.05nm, 1304.58nm, and 1309.14nm after passing through the Z-Block 31. Due to the use of narrowband filters 35, the wavelength order can be arbitrarily combined according to the electrical signal requirements.

[0044] In implementation, the converging lens array 4 is mainly used for focusing. The number of channels in the converging lens array 4 is the same as the number of channels in the wave demultiplexing component 3 for mutual matching. When the wave demultiplexing component 3 has 4 channels, as shown in Figure 3, the converging lens array 4 also includes at least 4 channels; when the wave demultiplexing component 3 has 8 channels, the converging lens array 4 also includes at least 8 channels. In implementation, the converging lens array 4 can be placed before or after the oblique prism 5. For example, in this embodiment, the converging lens array 4 is placed between the wave demultiplexing component 3 and the oblique prism 5. The beam demultiplexed by the wave demultiplexing component 3 passes through the converging lens array 4 and then enters the oblique prism 5. The converging lens array 4 is used to converge the beam demultiplexed by the wave demultiplexing component 3. In implementation, silicon lenses are preferred in the converging lens array 4, but glass lenses can also be used.

[0045] In this embodiment, the oblique prism 5 includes an incident surface 51, a reflecting surface 52, and a transmitting surface 53, as shown in Figures 2-7. The incident surface 51 corresponds to the wave demultiplexing component 3 and is used to receive the beam demultiplexed by the wave demultiplexing component 3. As shown in Figures 5-7, the reflecting surface 52 corresponds to both the incident surface 51 and the transmitting surface 53 and is used to reflect the beam received by the incident surface 51 and output the beam through the transmitting surface 53. In this embodiment, the angle between the incident surface 51 and the transmitting surface 53 is less than 90 degrees, as shown in Figure 5. That is, in this embodiment, the incident surface 51 and the transmitting surface 53 are not perpendicular.

[0046] In implementation, the converging lens array 4 and the oblique prism 5 can be installed in various ways. For example, the converging lens array 4 and the oblique prism 5 can be respectively disposed on the same substrate 6; or the converging lens array 4 can be disposed on the substrate 6, while the oblique prism 5 is disposed on the converging lens array 4; or the oblique prism 5 can be disposed on the substrate 6, while the converging lens array 4 is disposed on the oblique prism 5. As an example, in this embodiment, the bottom surface of the converging lens array 4 can be glued to the substrate 6, as shown in Figures 2-7. The incident surface 51 of the oblique prism 5 is glued together with the converging lens array 4, which can effectively reduce the coupling dimension, thereby facilitating a better coupling effect.

[0047] During assembly, the incident surface 51 of the oblique prism 5 is preferably in a vertical state, as shown in Figures 5-7. At this time, the transmission surface 53 is tilted to the horizontal plane. In practice, the angle A between the reflecting surface 52 and the incident surface 51 can preferably be 40° to 45°, which is more conducive to the light obtaining a larger exit angle on the transmission surface 53. This not only helps to further improve return loss, but also helps to avoid stray light interfering with electronic components. For example, in practice, the angle A between the reflecting surface 52 and the incident surface 51 can preferably be 42°, 43°, or 44°. As an example, in this embodiment, the angle A between the reflecting surface 52 and the incident surface 51 is 43°, as shown in Figure 5.

[0048] In implementation, the angle B between the transmission surface 53 and the incident surface 51 can preferably be 80° to 89°. This not only ensures that the light reflected from the receiver 7 exceeds the system's receiving range and cannot return to the incident end, effectively improving the return loss at the optical module's receiving end, but also makes it easier for the reflected light to approach the passive part, avoiding stray light interference with active devices. Simultaneously, it significantly reduces the difficulty of free-space coupling. For example, in implementation, the angle B between the transmission surface 53 and the incident surface 51 can preferably be 83°, 84°, 85°, 86°, 87°, etc. As an example, in this embodiment, the angle B between the transmission surface 53 and the incident surface 51 is 85°, as shown in Figure 5. This not only allows the return loss of the optical engine component to reach over 40dB, which is beneficial for obtaining higher return loss, but also prevents the light from reaching the TIA chip 8 next to the receiver 7 after one or two reflections, effectively avoiding stray light interference with electronic components.

[0049] In implementation, along the direction of the light beam incident on the incident surface 51, as shown in Figures 5-7, the transmission surface 53 can be tilted towards the reflective surface 52 or away from it. Since electronic components such as the TIA chip 8 are typically preferentially positioned on the outer side of the substrate 6, as shown in Figure 7, the transmission surface 53 can be preferentially tilted towards the reflective surface 52. This causes the light beam emitted from the transmission surface 53 to deflect further away from the electronic components such as the TIA chip 8 on the outer side of the receiver 7. This allows the horizontal position of the receiver 7 to be closer to the incident surface 51, preventing the light reflected by the receiver 7 from being reflected back to the front-end adapter 1 after passing through the transmission surface 53 and grazing the incident surface 51. This effectively improves the return loss at the optical module receiver. In implementation, the receiver 7 can be a photodetector (PD) 7 to collect optical signals.

[0050] In implementation, the angle C between the main beam emitted from the transmission surface 53 (i.e., the light at the center of the beam) and the vertical direction can be preferably configured to be 11° to 15°, as shown in Figures 6 and 7. This causes the beam emitted from the transmission surface 53 to be deflected further away from the electronic components such as the TIA chip 8 outside the receiver 7, so that the horizontal setting position of the receiver 7 can be closer to the incident surface 51. As a result, the light reflected by the receiver 7, after passing through the transmission surface 53, cannot be reflected back to the front-end adapter 1 when it grazes onto the incident surface 51, thereby effectively improving the return loss of the optical module receiver, which can usually reach more than 40dB. At the same time, these rays will not reach the TIA and other electronic components next to the receiver 7 after one or two reflections, avoiding stray light interference with electronic components. In implementation, the included angle C can be adjusted by changing parameters such as the material of the oblique prism 5, the angle of the transmission surface 53 in the oblique prism 5, and the angle of the reflection surface 52, so that the included angle C between the main beam emitted from the transmission surface 53 (i.e., the light at the center of the beam) and the vertical direction is preferably controlled to be 11° to 15°. For example, in implementation, the included angle C between the main beam emitted from the transmission surface 53 (i.e., the light at the center of the beam) and the vertical direction can be preferably controlled to be 12°, 13°, 14°, and 15°, etc.

[0051] In this embodiment, the multi-channel optical engine component receives an optical signal via adapter 1 and inputs it to collimator component 2. After collimation by collimator component 2, the signal is sent to wave demultiplexer component 3, where it is demultiplexed into four beams. These four beams are then directed to converging lens array 4. The beams, after being converged by the converging lens array 4, pass through the cemented surface and incident surface 51, are reflected by reflective surface 52, and then focused onto photodetector (PD) 7 via transmission surface 53, as shown in Figure 7. Because the angle between incident surface 51 and transmission surface 53 is less than 90 degrees, when incident surface 51 is vertical, transmission surface 53 is tilted to the horizontal plane, as shown in Figures 5-7. The light beam passes through this tilted horizontal transmission surface. The 53 output has two advantages. First, it allows the emitted beam to enter the receiver 7 at a larger angle, ensuring that the light reflected from the receiver 7 can exceed the system's receiving range and cannot return to the incident end. This effectively improves the return loss at the optical module's receiver, meeting the needs of larger capacity and higher speed communication systems. Second, it allows the reflected light from the receiver 7 to be closer to the passive parts and further away from electronic devices such as the TIA. This effectively reduces the probability of stray light from primary or secondary reflections directly hitting the TIA, thus greatly reducing interference to active electronic components such as the TIA chip 8 and avoiding system crosstalk and bit errors caused by stray light. In addition, this design also helps to reduce the difficulty of free space coupling.

[0052] Example 2

[0053] The main difference between this embodiment 2 and embodiment 1 is that the multi-channel optical engine component provided in this embodiment is specifically an eight-channel optical engine component, designed for use in eight-channel scenarios, such as 800G 2xLR4. For example, in this embodiment, the Z-Block 31 uses an eight-channel Z-Block 31, as shown in Figures 8 and 9. The eight filters 35 of this Z-Block 31 are divided into two identical groups, each group demultiplexing wavelengths 1295.56, 1300.05, 1304.58, and 1309.14 respectively. It is understood that in implementation, the wavelengths and wavelength order of each channel can be arbitrarily combined according to electrical signal requirements; further examples will not be provided here.

[0054] As shown in Figures 8 and 9, the eight-channel optical engine assembly is equipped with two adapters 1, which are connected to the optical fibers 21 in the two collimator assemblies 2 respectively. The two collimator assemblies 2 correspond to Z-Block 31 respectively. At the same time, as shown in Figures 8 and 9, the converging lens array 4 is an eight-channel converging lens array 4, which corresponds to eight channels of Z-Block 31, so as to focus the light beam onto the photodetector (PD) 7.

[0055] Understandably, according to this design, this multi-channel optical engine component can also be expanded into a sixteen-channel optical engine component, a thirty-two-channel optical engine component, etc., which will not be listed here.

[0056] Example 3

[0057] This embodiment provides an optical module, including the multi-channel optical engine component of Embodiment 1 or Embodiment 2.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A multi-channel optical engine assembly for improving return loss at the receiver of an optical module, characterized in that, The device includes a wave demultiplexing component and a prism. The wave demultiplexing component is used to demultiplex a collimated optical signal into at least two beams. The prism includes an incident surface, a reflecting surface, and a transmitting surface. The incident surface corresponds to the wave demultiplexing component and is used to receive the beams demultiplexed by the wave demultiplexing component. The reflecting surface corresponds to the incident surface and the transmitting surface and is used to reflect the beams received by the incident surface and output the beams through the transmitting surface. The angle between the incident surface and the transmitting surface is less than 90 degrees.

2. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 1, characterized in that, The angle between the transmission surface and the incident surface is 80° to 89°.

3. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 2, characterized in that, The angle between the transmission surface and the incident surface is 85°.

4. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 1, characterized in that, The angle between the reflecting surface and the incident surface is 40° to 45°.

5. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 4, characterized in that, The angle between the reflecting surface and the incident surface is 43°.

6. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 1, characterized in that, Along the direction in which the light beam enters the incident surface, the transmitting surface is tilted towards the direction of the reflecting surface.

7. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 1, characterized in that, The angle between the beam emitted from the transmission surface and the vertical direction is 11° to 15°.

8. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 1, characterized in that, The wavelength demultiplexing component includes a Z-Block, and the output of the Z-Block has at least two filters or filter films with different operating wavelengths.

9. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 8, characterized in that, The Z-Block used is a 4-channel Z-Block or an 8-channel Z-Block.

10. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 1, characterized in that, It also includes a converging lens array, which is disposed between the wave demultiplexing component and the oblique prism. The beam demultiplexed by the wave demultiplexing component passes through the converging lens array and then enters the incident surface of the oblique prism.

11. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 10, characterized in that, The incident surface of the oblique prism is cemented together with the converging lens array; The number of channels in the converging lens array is the same as the number of channels in the wave decomposition and multiplexing component.

12. The multi-channel optical engine component for improving return loss at the optical module receiver according to claim 1, characterized in that, It also includes a collimator assembly, which corresponds to the wave demultiplexing assembly and is used to transmit the collimated optical signal to the wave demultiplexing assembly.

13. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 12, characterized in that, The collimator assembly includes an optical fiber, an optical fiber head, a collimating lens, and a sleeve. One end of the optical fiber is connected to the optical fiber head. The end of the optical fiber head facing away from the optical fiber is constructed as a first inclined surface. The end of the collimating lens facing the optical fiber head is constructed as a second inclined surface adapted to the first inclined surface. The optical fiber head and the collimating lens are encapsulated in the same sleeve, and the first inclined surface corresponds to the second inclined surface.

14. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 13, characterized in that, The inclination angles of the first and second inclined planes are 4° to 11°.

15. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 14, characterized in that, The inclination angle of the first and second inclined planes is 8°.

16. The multi-channel optical engine component for improving return loss at the optical module receiver according to any one of claims 1-15, characterized in that, It also includes an adapter connected to the collimator assembly.

17. The multi-channel optical engine component for improving return loss at the optical module receiver according to any one of claims 1-15, characterized in that, It also includes a substrate, on which the wave decomposition and multiplexing component, converging lens array and collimator component are respectively disposed.

18. The multi-channel optical engine assembly for improving return loss at the optical module receiver according to claim 17, characterized in that, The wave decomposition and multiplexing component, the converging lens array, and the collimator component are all attached to the substrate.

19. An optical module, characterized in that, Includes the multi-channel optical engine component as described in any one of claims 1-18.

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