Optical module receiving device and optical module

Abstract

The utility model relates to the technical field of optical modules, in particular to an optical module receiving device and an optical module.The optical module receiving device comprises a first optical path and a second optical path, the first optical path and the second optical path are arranged in a spaced mode, and the first optical path comprises a first optical assembly and a first secondary optical assembly which are arranged in a spaced mode; one side, close to the first secondary optical component, of the first optical component is provided with a filter; and the filter is used for transmitting light to the first secondary optical component and reflecting the light on the first optical component to the second optical path. The objective of the utility model is to solve the technical problems of large optical path coupling difficulty and high cost when a conventional optical module receiving device faces an eight-channel trans-impedance amplifier.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical module technical field, specifically, relate to an optical module receiving device and optical module. BACKGROUND

[0002] In the field of optical communication technology, when the receiving end optical path system is constructed according to FR8 optical module MSA protocol, the traditional design idea mainly develops around the layout of specific light splitting and signal receiving elements. The prior art usually adopts 8-channel demultiplexer for light splitting operation to realize the decomposition of one optical signal into eight channels. However, this scheme faces many challenges in practical application. Due to the physical layout limitation of the eight-channel transimpedance amplifier (TIA) array, the distance between channels and the relatively long optical path will introduce large signal loss and noise interference, making the coupling compatibility between channels poor, and in the actual coupling process, it is easy to appear the uneven phenomenon that part of the channels have high coupling efficiency and part of the channels have low coupling efficiency. Ultimately, the responsivity of the entire receiving assembly is difficult to reach the ideal level. At the same time, this design scheme requires very high process precision, which greatly increases the production cost. SUMMARY

[0003] The utility model aims at providing an optical module receiving device and an optical module to solve the technical problems of high cost and large difficulty in optical coupling when the traditional optical module receiving device faces an 8-channel transimpedance amplifier.

[0004] To achieve the above-mentioned purpose, the technical scheme of the first aspect of the utility model provides an optical module receiving device, which comprises a first optical path and a second optical path, the first optical path and the second optical path are spaced apart, the first optical path comprises a first optical assembly and a first secondary optical assembly which are spaced apart, the first optical assembly is provided with a filter sheet on the side close to the first secondary optical assembly, and the filter sheet is used for transmitting light to the first secondary optical assembly and reflecting light on the first optical assembly to the second optical path.

[0005] Further, the second optical path comprises a second optical assembly and a second secondary optical assembly which are spaced apart.

[0006] Further, the second optical assembly is spaced apart from the bottom of the first optical assembly.

[0007] Further, the second optical assembly is provided with a reflective coating on the side close to the second secondary optical assembly, and the reflective coating is used for reflecting light on the second optical assembly to the second secondary optical assembly.

[0008] Further, the first secondary optical assembly and the second secondary optical assembly both adopt a 4-channel demultiplexer.

[0009] Further, it further comprises a focusing lens, and the focusing lens is arranged at the output end of the first optical path and the second optical path.

[0010] Further, a photodiode is further included for converting the optical signal from the focusing lens into an electrical signal.

[0011] Further, a transimpedance amplifier is further included for amplifying the electrical signal from the photodiode.

[0012] The second aspect of the utility model provides a kind of optical module, including the optical module receiving device described in the technical scheme of the first aspect of the utility model.

[0013] The beneficial effects of the utility model include:

[0014] 1.The optical module receiving device provided by the utility model realizes fine light splitting of collimated light inside optical module by double optical path structure and filter sheet;Compared with the traditional design relying on single eight-channel transimpedance amplifier (TIA) and complex fixed optical path, the optical module receiving device can use two four-channel TIAs to match the first optical path and the second optical path, thereby avoiding the problems of difficult selection, high cost and difficulty in adapting to different TIA spacing of eight-channel TIA, effectively reducing the production cost of optical module;On the other hand, the double optical path structure can ensure that the eight channels of photodetector obtain sufficient and balanced light, avoid the problem of small response caused by insufficient light collection of individual channels, and make the optical module receiving performance more stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments of the utility model, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, other related drawings can also be obtained according to these drawings without creative labor.

[0016] Fig. 1 The optical path schematic diagram of the optical module receiving device provided by the embodiments of the utility model is shown in the figure;

[0017] Fig. 2 The structure schematic diagram of the optical module receiving device provided by the embodiments of the utility model is shown in the figure;

[0018] Figure legend: 1-first light assembly, 2-first secondary light assembly, 3-second light assembly, 4-second secondary light assembly, 5-focusing lens, 6-photodiode, 7-transimpedance amplifier. DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the utility model will be described below in combination with the drawings in the embodiments of the utility model.

[0020] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. It should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0021] Please refer to Figs. 1-2 As shown in the drawings, the utility model first aspect of technical scheme provides a kind of optical module receiving device, including first optical path and second optical path, and the first optical path and second optical path are spaced apart, and the first optical path includes the first optical component 1 and the first secondary optical component 2 spaced apart, and the first optical component 1 is equipped with filter (not shown in the drawing) on the side close to the first secondary optical component 2, and the filter is used to transmit light to the first secondary optical component 2 and reflect the light on the first optical component 1 to the second optical path;Specifically, the embodiment adopts double optical path structure, and in the first optical path, the first optical component 1 is arranged with the first secondary optical component 2, and the filter plays a role according to the wavelength characteristics of light, when collimated light inside optical module is incident to the first optical component 1, the filter can adopt specific optical film layer design, part of light beam can pass through filter and enter the first secondary optical component 2 according to preset rule, and the other part of light that cannot pass through filter is reflected to the second optical component 3 of second optical path;Preferably, the first optical component 1 is preferably placed at 13.5 °, and the first optical component 1 divides collimated light inside optical module into two paths according to the distribution of wavelength, and the light with wavelength greater than 1307.5nm is transmitted to the first secondary optical component 2 through the filter of the first optical component 1, and the light with wavelength less than 1305.5nm is reflected into the second optical component 3 through the filter;Preferably, the first secondary optical component 2 and the second secondary optical component 4 all adopt 4-channel demultiplexer;4-channel demultiplexer greatly improves the decomposition and shunt accuracy of optical signal. Compared with the traditional eight-channel light splitting mode, 4-channel demultiplexer can more efficiently guide light of different wavelengths to the corresponding processing channel, reduce the confusion and loss of optical signal, make the subsequent photoelectric conversion and signal processing more accurate, and thus improve the transmission rate and data processing capacity of the entire optical module.

[0022] The light module receiving device provided by the utility model realizes fine light splitting of collimated light inside the light module through the innovative double light path structure and the filter; compared with the traditional design of relying on a single eight-channel transimpedance amplifier and a complex fixed light path, the light module receiving device can adopt two four-channel TIAs to match the first light path and the second light path, thereby avoiding the problems of difficult selection of an eight-channel TIA, high cost and difficulty in adapting to different TIA spacings, and effectively reducing the production cost of the light module; on the other hand, the double light path structure can ensure that the eight channels of photodetectors obtain sufficient and balanced light, avoid the problem of small responsivity of individual channels due to insufficient light collection, and make the light module receiving performance more stable and reliable.

[0023] Preferably, the second light path comprises a second light assembly 3 and a second secondary light assembly 4 which are arranged at intervals, the second light assembly 3 is arranged at the bottom of the first light assembly 1, and the side of the second light assembly 3 close to the second secondary light assembly 4 is provided with a reflective coating (not shown in the figure), which is used for reflecting the light on the second light assembly 3 to the second secondary light assembly 4; specifically, the reflective coating can receive the light reflected from the first light assembly 1 and couple into the second secondary light assembly 4, and the reflective coating is preferably an optical thin film material which is matched with the filter but has a unique wavelength response characteristic; a coating process such as PVD or CVD can be used to adjust the film layer parameters so that it can accurately receive the light reflected from the first light assembly 1; for example, when the light with a wavelength less than 1305.5nm is reflected by the filter of the first light assembly 1 to the second light assembly 3, the reflective coating will couple the light into the second secondary light assembly 4 efficiently according to the high transmittance interval (for this specific wavelength range) designed by itself; through the cooperation between the double light paths and the collaborative work of the filter and the reflective coating, the device has stronger adaptability and stability when facing different wavelength and intensity of optical signal input. Even if the input optical signal fluctuates or changes, each light path assembly and the reflective coating can adjust flexibly according to its own characteristics to ensure that the photodetectors of the eight channels can always receive stable and sufficient light and maintain stable responsivity.

[0024] Preferably, the focusing lens 5 is arranged at the output end of the first light path and the second light path; specifically, the focusing lens 5 is used for coupling the light in the first secondary light assembly 2 and the second secondary light assembly 4 to the photodiode 6; after the wavelength division multiplexing of the first secondary light assembly 2 and the second secondary light assembly 4, the light beams are coupled and reflected by the prism to be focused on the light-sensitive surface of the PD again; in this embodiment, high-precision photodiodes are selected to ensure that the photodiodes 6 of the eight channels have sufficient light collection, avoid the situation that the responsivity of individual channels is small, and reduce the coupling difficulty of the focusing lens 5.

[0025] Preferably, the photodiode 6 is further used for converting the optical signal from the focusing lens 5 into an electrical signal; specifically, the photodiode 6 is used for converting the optical signal into an electrical signal; on the other hand, the photodiode 6 is internally provided with a high-sensitivity light intensity detection unit, which can realize real-time sensing of the light signal intensity change transmitted from the first secondary light assembly 2 and the second secondary light assembly 4. Based on the interference principle of light and the pre-set light intensity threshold range, when the light signal intensity fluctuates, the photodiode 6 rapidly feeds back the electrical signal to the control system; the microprocessor of the control system can quickly process and analyze the feedback signal; once it is judged that the distance tolerance between the first secondary light assembly 2 and the second secondary light assembly 4 exceeds the range of ±0.02mm, the adjustment mechanism can be started to adjust the distance, so as to ensure the stability of the light signal transmission.

[0026] Preferably, the trans-impedance amplifier 7 is further used for amplifying the electrical signal from the photodiode 6; the trans-impedance amplifier 7 is preferably two 4-channel trans-impedance amplifiers 7, which does not need to separately select an 8-channel trans-impedance amplifier; the problems of selection difficulty, high cost and poor adaptability to existing optical modules of the 8-channel TIA are solved, and a more flexible and economical solution is provided by adopting the combination of two 4-channel TIAs. Since two 4-channel TIAs are adopted, it is not necessary to redesign the complex printed circuit board assembly (PCBA) layout, thereby further reducing the cost. The two 4-channel TIAs need to cooperate during the working process to realize efficient amplification of the multiple electrical signals from the photodiode 6. In terms of signal processing adaptability, the dual optical path design of the embodiment can perform individualized configuration and dynamic adjustment on the TIA of each optical path according to optical signals of different wavelengths and intensities, greatly widening the adaptability of the optical module to complex light environments and improving the receiving sensitivity and dynamic range of the optical module.

[0027] The second aspect of the technical scheme of the utility model provides a kind of optical module, including the optical module receiving device described in the technical scheme of the first aspect of the utility model.

[0028] In addition to the above description, the following points need to be explained:

[0029] (1) the drawings of the embodiment of the present disclosure only involve the structures involved in the embodiment of the present disclosure, and other structures can be referred to the usual design;

[0030] (2) the control program of the photodiode, the trans-impedance amplifier and the like in the present disclosure are mature conventional technologies in the prior art, and the skilled in the art can realize the application of the utility model according to the same function principle in the prior art. This program part is not the innovation point of the utility model;

[0031] (3) in the case of no conflict, the embodiments of the present disclosure and the features in the embodiments can be combined to obtain new embodiments.

[0032] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An optical module receiving device, characterized by, The light module comprises a first light path and a second light path, the first light path and the second light path are arranged at intervals, the first light path comprises a first light component and a first secondary light component arranged at intervals, the first light component is provided with a filter on a side close to the first secondary light component, the filter is used for transmitting light to the first secondary light component and reflecting light on the first light component to the second light path.

2. The optical module receiving apparatus according to claim 1, characterized by The second light path comprises a second light component and a second secondary light component arranged at intervals.

3. The optical module receiving device according to claim 2, characterized in that, The second light component is arranged at the bottom of the first light component.

4. The optical module receiving apparatus according to claim 3, wherein The second light component is provided with a reflective coating on a side close to the second secondary light component, the reflective coating is used for reflecting light on the second light component to the second secondary light component.

5. The optical module receiving device according to any one of claims 1 to 4, characterized in that, The first secondary light component and the second secondary light component are both 4-channel demultiplexers.

6. The optical module receiving apparatus according to claim 5, wherein The light module further comprises a focusing lens arranged at the output end of the first light path and the second light path.

7. The optical module receiving apparatus according to claim 6, wherein The light module further comprises a photodiode used for converting light signals from the focusing lens into electrical signals.

8. The optical module receiving device according to claim 7, wherein The light module further comprises a transimpedance amplifier used for amplifying the electrical signals from the photodiode.

9. An optical module characterized by comprising: The light module receiving device comprises any one of claims 1 to 8. The light module receiving device comprises any one of claims 1 to 8.

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