WO2022042178A1

WO2022042178A1 - Optical module and network device

Info

Publication number: WO2022042178A1
Application number: PCT/CN2021/108625
Authority: WO
Inventors: 尹纯静; 庄煜阳; 高士民; 郑建宇; 林友熙; 毕红军
Original assignee: 华为技术有限公司
Priority date: 2020-08-24
Filing date: 2021-07-27
Publication date: 2022-03-03
Also published as: CN114089485A

Abstract

An optical module (10) and a network device. The optical module (10) comprises an emission assembly (11), and the emission assembly (11) comprises a light source (111) used for outputting a first outgoing beam, and a first adjustment assembly (112) used for adjusting the first outgoing beam into a second outgoing beam. The first outgoing beam is a single-mode beam. The mode field diameter of the second outgoing beam is greater than the mode field diameter of the first outgoing beam. The second outgoing beam can generate M modes in a multi-mode optical fiber, and the first outgoing beam being can generate N modes in a multi-mode optical fiber, where 1 ≤ M < N. Given that it is guaranteed that a current multi-mode optical fiber layout scenario does not change, an optical signal transmission rate is improved by means of designing and modifying the optical module (10).

Description

Optical modules and network equipment

This application is required to be submitted on August 24, 2020, the application number is 202010858348.X, the name of the invention is "optical signal transmission method, optical module and network equipment", and it was submitted on September 23, 2020, the application number is 202011009654.2, The priority of the Chinese patent application entitled "Optical Module and Network Equipment", the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of communication technologies, and in particular, to an optical module and a network device.

Background technique

In optical fiber communication, optical fiber is a common transmission medium. Optical fiber is divided into single-mode fiber (single-mode fiber, SMF) and multi-mode fiber (multi-mode fiber, MMF). At a certain operating wavelength, multi-mode fiber can transmit multiple modes, while single-mode fiber only supports fundamental mode transmission. Single-mode fiber is used for long-distance optical communication, and multi-mode fiber is mainly used for short-distance optical communication.

At present, data center networks and campus networks usually use multimode optical fiber transmission systems for communication. Limited by the modal bandwidth of multimode fiber and the influence of chromatic dispersion, the transmission distance of multimode fiber is limited, and as the transmission rate increases, the transmission distance will be further shortened.

With the continuous increase of communication demand, the communication traffic is also further increasing, which requires the transmission rate to be further improved. In this scenario, the traditional multimode optical fiber transmission system has been difficult to support the current transmission distance. However, the optical fibers laid in the current data center network and campus network are basically multi-mode fibers. If a single-mode transmission system is used to achieve rate upgrades, it is necessary to re-lay single-mode fibers and replace the existing multi-mode fibers, which will greatly increase the network construction cost.

How to improve the data transmission rate while keeping the original optical fiber laying scene unchanged has become an urgent problem to be solved.

SUMMARY OF THE INVENTION

The present application provides an optical module and network equipment to solve the problem that most of the current campus and data center networks use multi-mode optical fibers as the data transmission medium, and it is difficult to improve the transmission rate and transmission distance.

A first aspect of the present application provides an optical module, which includes an emission component (11). The emission component (11) includes a light source (111) and an adjustment component (112). The light source (111) is used for outputting a first outgoing beam; the first outgoing beam is a single-mode beam. The adjustment component (112) is used to adjust the first outgoing beam into a second outgoing beam, and transmit the second outgoing beam to a multimode fiber, wherein the mode field diameter of the second outgoing beam is larger than that of the first outgoing beam The mode field diameter of the outgoing beam.

Optionally, the second outgoing beam can generate M modes in the multimode fiber, and the first outgoing beam can generate N modes in the multimode fiber, 1≤M<N.

The optical module provided by the embodiment of the present application can increase the mode field diameter of the first outgoing beam to obtain a second outgoing beam, so that after the second outgoing beam enters the multimode fiber, one or a few more beams are generated in the multimode fiber. A mode is obtained, the modal dispersion generated when the second outgoing beam is transmitted in the multimode fiber is reduced, the transmission bandwidth of the multimode fiber is increased, and the transmission distance of the second outgoing beam in the multimode fiber is prolonged.

Optionally, the mode field diameter of the second outgoing beam is similar to the fundamental mode diameter of the multimode fiber. For example, the difference between the mode field diameter of the second outgoing beam and the fundamental mode diameter of the multimode fiber is smaller than a set threshold. When the mode diameter of the second outgoing beam is close to the fundamental mode diameter of the multimode fiber, the second outgoing beam can only produce one or a few modes in the multimode fiber, which can reduce the The modal dispersion generated during transmission in the multimode fiber increases the transmission bandwidth of the multimode fiber and prolongs the transmission distance of the second outgoing light beam in the multimode fiber.

Optionally, the adjustment component (112) includes a lens group (1123), and the lens group (1123) is used to adjust the first outgoing light beam to the second outgoing light beam. The present application only adjusts the first outgoing light beam to the second outgoing light beam through the lens group, which can avoid modifying other structures of the optical module and reduce the complexity of the modification of the optical module.

Optionally, the adjustment component (112) includes a medium (1121), and the core diameter of the first end (1121a) of the medium (1121) close to the light source (111) is smaller than that of the medium (1121) close to the multiple The core diameter of the second end (1121b) of the mode fiber.

Optionally, it is characterized in that the adjustment component (112) includes a medium (1122), and the core diameter of the medium (1122) is larger than the core diameter of the reference single-mode optical waveguide, and is smaller than or equal to the multi-mode optical waveguide The core diameter of an optical fiber.

Optionally, the adjustment component (112) includes a medium (1121) and a lens group (1123), and the lens group (1123) is configured to cooperate with the medium (1121) to adjust the first outgoing light beam to the second light beam. Two beams.

Optionally, the adjustment component (112) includes a medium (1122) and a lens group (1123), and the lens group (1123) is configured to cooperate with the medium (1122) to adjust the first outgoing light beam to the second light beam. Two beams.

Optionally, the emission component (11) further comprises a reference single-mode optical waveguide (113), and the reference single-mode optical waveguide (113) is disposed between the light source (111) and the adjustment component (112) , the adjusting component (112) adjusts the first outgoing beam input from the reference single-mode optical waveguide to the second outgoing beam. The adjustment assembly (112) is any one of the above-mentioned embodiments.

The present application provides multiple implementation manners of the emitting assembly (11), so that the selection of the optical module is more flexible and can be adapted to the needs of various scenarios.

Optionally, the optical module further includes a compensation circuit (17), the compensation circuit (17) is configured to acquire an electrical signal and adjust the electrical signal so that the electrical signal passes through the light corresponding to the optical module After the link is transmitted, the preset requirements are still met. Specifically, one or more algorithms and requirements for performance (for example, distance, delay, bandwidth, etc.) can be preset in the compensation circuit (17). After the compensation circuit (17) obtains the electrical signal, A corresponding algorithm can be selected to adjust the electrical signal, so that the electrical signal can still meet the requirement after being transmitted through the optical link corresponding to the optical module, thereby improving the practicability of the optical module.

A second aspect of the present application provides another optical module, which includes a receiving component (12). The receiving assembly (12) includes an adjusting assembly (121) for adjusting the first incident beam that reaches the adjusting assembly (121) through the multimode fiber into a second incoming beam, and the diameter of the second incoming beam smaller than the diameter of the first incident beam. The diameter of the second incoming beam is smaller than the diameter of the first incoming beam, which can be realized by only receiving part of the light of the first incoming beam, or by converging the first incoming beam. In the present application, by reducing the diameter of the light beam received at the receiving end of the optical module, the modal dispersion of the optical signal can be reduced, and the transmission performance of the multimode fiber can be improved.

Optionally, the receiving component (12) further includes a photodetector (122), and the photodetector (122) is used to convert the second incoming light beam into an electrical signal.

Optionally, the adjustment component (121) includes a lens group (1213), and the lens group (1213) is used for reducing and adjusting the first incident light beam to the second incident light beam.

Optionally, the adjustment component (121) includes a medium (1211), and the core diameter of the medium (1211) close to the first end (1211a) of the multimode optical fiber is larger than that of the medium (1211) away from the The core diameter of the second end (1211b) of the multimode fiber.

Optionally, the core diameter of the first end (1211a) of the medium (1211) is smaller than the core diameter of the multimode fiber

Optionally, the adjustment component (121) includes a medium (1212), and the core diameter of the medium (1212) is greater than the core diameter of the reference single-mode optical waveguide, and is smaller than or equal to the core of the multimode optical fiber diameter.

Optionally, the adjustment component (121) includes a medium (1211) and a lens group (1213), and the lens group (1213) is configured to cooperate with the medium (1212) to adjust the first incoming light beam to the second light beam. Two into the beam.

Optionally, the adjustment component (121) includes a medium (1212) and a lens group (1213), and the lens group (1213) is configured to cooperate with the medium (1212) to adjust the first incoming light beam to the second light beam. Two into the beam.

Optionally, it is characterized in that, the receiving component (12) further comprises a reference single-mode optical waveguide (123), and the reference single-mode optical waveguide (123) is arranged between the adjustment component (121) and the photodetector Between the detectors (122), the adjustment component (121) transmits the second incoming light beam to the photodetector (122) via the reference single-mode optical waveguide (123). The adjustment assembly (121) is any one of the above-mentioned embodiments.

The present application provides multiple implementations of the receiving component (12), so that the selection of the optical module is more flexible and can be adapted to the needs of various scenarios.

Optionally, the diameter of the photosensitive surface of the photodetector (122) is greater than 20 microns. The present application provides a photodetector with a large photosensitive surface, which can completely receive the light beam transmitted through the adjustment component (121), thereby improving the signal receiving efficiency.

Optionally, the optical module further includes a compensation circuit (17), the compensation circuit (17) is configured to acquire an electrical signal and adjust the electrical signal so that the electrical signal passes through the optical link corresponding to the optical module The preset requirements are still met after transmission.

A third aspect of the present application provides a network device, including the optical module according to the above-mentioned first aspect and each implementation manner of the present application, and/or the optical module described in the above-mentioned second aspect and each of its implementation manners.

Description of drawings

FIG. 1 is a schematic structural diagram of an optical module provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of the launch assembly 11 provided by the present application;

3 is a schematic structural diagram of a reference single-mode optical waveguide provided by the present application;

FIG. 4a is a schematic structural diagram of the first embodiment of the launch assembly 11 provided by the application;

FIG. 4b is a schematic structural diagram of a second embodiment of the launch assembly 11 provided by the present application;

FIG. 4c is a schematic structural diagram of a third embodiment of the launch assembly 11 provided by the present application;

FIG. 4d is a schematic structural diagram of a fourth embodiment of the launch assembly 11 provided by the present application;

FIG. 4e is a schematic structural diagram of a fifth embodiment of the launch assembly 11 provided by the present application;

FIG. 5 is a schematic structural diagram of the receiving assembly 12 provided by the present application;

FIG. 5a is a schematic structural diagram of the first embodiment of the receiving assembly 12 provided by the present application;

FIG. 5b is a schematic structural diagram of a second embodiment of the receiving assembly 12 provided by the present application;

FIG. 5c is a schematic structural diagram of a third embodiment of the receiving assembly 12 provided by the present application;

FIG. 5d is a schematic structural diagram of a fourth embodiment of the receiving assembly 12 provided by the present application;

FIG. 5e is a schematic structural diagram of a fifth embodiment of the receiving assembly 12 provided by the present application.

detailed description

The embodiments of the present application are used to enable the multimode optical fiber to transmit single-mode optical signals or optical signals of a small number of modes, so as to improve the transmission bandwidth of the multimode optical fiber and increase the transmission distance of the multimode optical fiber.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner.

In the embodiments of the present application, unless otherwise specified, the meaning of "plurality" refers to two or more. For example, a plurality of nodes refers to two or more nodes. "At least one" refers to any number, eg, one, two, or more. "A and/or B" can be A only, B only, or both A and B. "At least one of A, B, and C" may be A only, B only, C only, or both A and B, B and C, A and C, or A, B and C included. The terms "first" and "second" in this application are only used to distinguish different objects, and are not used to indicate the priority or importance of the objects.

In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , it is a schematic structural diagram of an optical module 10 according to an embodiment of the present application. The optical module 10 includes a transmitting component 11 and a receiving component 12, wherein the transmitting component 11 is used for generating a first outgoing beam, adjusting the first outgoing beam into a second outgoing beam, and transmitting the second outgoing beam to the first multimode fiber Outgoing beam, the first outgoing beam is a single-mode beam, the second outgoing beam is a single-mode beam or a multi-mode beam with a small amount of dispersion, and the second outgoing beam can be excited in the first multimode fiber or generate M species mode, the first outgoing beam can excite or generate N modes in the first multimode fiber, 1≤M<N. The receiving component 12 is used for receiving the first incoming beam from the second multimode fiber, and reducing the diameter of the first incoming beam to obtain a second incoming beam, the diameter of the second outgoing beam being smaller than the diameter of the first outgoing beam.

Further, the optical module 10 also includes components for realizing optical communication. For example, in the transmission direction, the optical module 10 first receives the digital electrical signal sent by the external device through the interface circuit 18, and sends it to the compensation circuit 17 (optional) , the compensation circuit 17 adjusts the digital electrical signal (for example, performs bandwidth pre-compensation, or changes the signal strength, or improves the signal’s high frequency, noise elimination, etc.), so that the digital electrical signal still meets the preset requirement after being transmitted through the optical link corresponding to the optical module 10 . Optionally, in the sending direction, the optical module 10 further includes a digital-to-analog converter (DAC) 15 for converting the digital electrical signal (which may be processed by the compensation circuit, or directly obtained from the interface circuit 18 ). ) into an analog electrical signal, so as to transmit the analog electrical signal to the first amplifier 13, the first amplifier enhances the analog electrical signal and transmits it to the transmitting component 11, and the transmitting component 11 generates and transmits the enhanced analog electrical signal to the transmitting component 11. The outgoing beam of the first multimode fiber.

In the receiving direction, the receiving component 12 converts the incoming light beam received through the second multimode fiber into an analog electrical signal and transmits it to the second amplifier 14, and the second amplifier 14 amplifies the analog electrical signal and transmits it to the analog-to-digital converter ( analog to digital converter, ADC) 16, the ADC 16 converts the analog electrical signal into a digital electrical signal, and the digital electrical signal is directly transmitted to the interface circuit 18 or transmitted to the interface circuit 18 after being compensated by the compensation circuit 17, and the interface circuit 18 will This digital electrical signal is transmitted to external devices. In the present application, the transmitting component 11 can enable the outgoing light beam emitted by the optical module 10 to the first multimode fiber to excite only one or a smaller number of modes in the first multimode fiber, and the receiving component 12 can enable the optical module 10 to emit light from the first multimode fiber. Partial modes of the incoming beam received by the two multimode fibers are selectively received, so as to improve the mode bandwidth of the multimode fibers and increase the transmission rate and distance.

FIG. 1 is only an implementation of the optical module 10 provided in the present application. In a specific application, the optical module 10 may only use the transmitting component 11 in the present application (the receiving component adopts a conventional manner), or only the The receiving component 12 (the transmitting component adopts a conventional manner), of course, the optical module 10 may also include the transmitting component 11 and the receiving component 12 of the present application at the same time. The transmitting component 11 and the receiving component 12 provided in this application will be described in detail below.

In one embodiment, as shown in FIG. 2 , the emission component 11 includes a light source 111 and a first adjustment component 112 . The light source 111 is used for outputting the first outgoing light beam. For example, the light source 111 outputs the first outgoing light beam under the trigger of the electric signal amplified by the first amplifier 13 . The first outgoing beam is a single-mode beam. The first adjustment component 112 is used to adjust the first outgoing beam into a second outgoing beam, the mode field diameter of the second outgoing beam is larger than the mode field diameter of the first outgoing beam, and the first outgoing beam can be The first multimode fiber generates N modes; when the second outgoing beam enters the first multimode fiber, the second outgoing beam can generate M modes in the first multimode fiber, 1≤ M<N. In this application, the first outgoing beam and the second outgoing beam are different names for the same beam at different stages, and are not used to distinguish different beams. The light source 111 can be any kind of laser, for example, vertical external surface emission laser (VCSEL), directly modulated laser (DML), electro-absorption modulated laser (EML) ), or silicon light lasers, etc.

In one embodiment, the first adjustment assembly 112 includes a medium and/or a lens group for transmitting optical signals to the first multimode fiber shown in FIG. 1 . Currently, the medium included in the optical module may be referred to as a reference single-mode optical waveguide. As shown in FIG. 3 , it is a schematic structural diagram of a reference single-mode optical waveguide. The core diameter of the reference single-mode optical waveguide is usually 8-10 μm, and in FIG. 3 , the core diameter is 9 μm as an example. The dielectric is also encapsulated with an outer layer, and the diameter of the outer layer is usually 125 μm. The present application controls the mode field diameter of the second outgoing light beam entering the first multimode optical fiber by arranging a specially structured medium and/or lens group in the transmitting component 11 . The structure of the emission component 11 provided by the embodiment of the present application will be described below with reference to FIG. 4a to FIG. 4e.

As shown in FIG. 4 a , which is a schematic structural diagram of the first embodiment of the launch assembly 11 provided by the present application, the first adjustment assembly 112 in the launch assembly 11 includes a first medium 1121 . The core diameter of the first end 1121a of the first medium 1121 close to the light source 111 is smaller than the core diameter of the first end 1121b of the first medium 1121 close to the first multimode fiber. Further, the core diameter of the second end is less than 50 μm. The 9 μm of the first end 1121 a and the 10 μm to 15 μm of the second end 1121 b in FIG. 4 a are only one embodiment, and the present application is not limited thereto. Optionally, the first medium 1121 is a thermally expanded core (TEC) fiber or a tapered fiber. As shown in FIG. 4b , it is a schematic structural diagram of the second embodiment of the emitting assembly 11 provided by the present application. The first adjusting component 112 in the emitting component includes a second medium 1122, and the diameter of the core of the second medium 1122 is uniform, that is, the diameter of the core of the second medium 1122 near the first end 1122a of the light source 111 is equal to that of the second medium 1122 connects the core diameter of the second end (1122b) of the first multimode fiber. The core diameter of the medium 1122 is larger than the core diameter of the reference single-mode optical waveguide, and smaller than or equal to the core diameter of the first multimode optical fiber. In one embodiment, the core diameter of the medium 1122 is less than or equal to 15 [mu]m. In another embodiment, the core diameter of the medium 1122 may be less than 50 μm. 10 μm˜15 μm in FIG. 4b is only one embodiment. Further, when the diameter of the core of the second medium 1122 is relatively large (eg, equal to or close to 50 μm), other devices are required to adjust the first outgoing beam to the second outgoing beam.

On the basis of FIG. 4a or FIG. 4b, the emitting component 11 provided by the present application may further include a lens group, which will be described below by taking FIG. 4b as an example. As shown in FIG. 4c , it is a schematic structural diagram of a third embodiment of the emitting assembly 11 provided in the present application. Wherein, the first adjustment component 112 may further include a first lens group 1123, the first lens group 1123 is disposed between the light source 111 and the second medium 1122, and is used to cooperate with the second medium 1122 to the first output lens The light beam is adjusted to the second outgoing light beam. Similarly, the first lens group 1123 can also cooperate with the first medium 1121 to adjust the first outgoing light beam into a second outgoing light beam. The first lens group 1123 includes at least one lens. For example, the first lens group 1123 includes a collimating lens and a converging lens. The collimating lens is used to adjust the first outgoing beam to make the first outgoing beam more collimated. The outgoing beam can be coupled to the second medium 1122 .

In another scenario, as shown in FIG. 4d , which is a schematic structural diagram of the fourth embodiment of the emitting assembly 11 provided by the present application, the first adjustment assembly 112 may not include a medium, but only include the first lens group 1123 . A lens group 1123 is disposed between the light source 111 and the first multimode fiber, and adjusts the first outgoing beam output by the light source 111 to the second outgoing beam.

Further, the launch assembly 11 may further include a first ferrule, and the first ferrule is used for inserting a medium. For example, when the first adjustment component 112 only includes the first medium 1121 or the second medium 1122, the first adjustment component 112 is connected to the first ferrule (because the medium is wrapped by the ferrule, it can also be said that the first adjustment component 112 is placed inside the first ferrule). The first medium 1121 or the second medium 1122 may not be inserted into the ferrule, but can be installed in the transmitting assembly 11 by using other firmware.

Optionally, as shown in FIG. 4e , it is a schematic structural diagram of the fifth embodiment of the launch assembly 11 provided in the present application. The launch assembly 11 may also include a reference single-mode optical waveguide 113 . In this scenario, the reference single-mode optical waveguide 113 is arranged between the light source 111 and the first adjustment component 112 , and the reference single-mode optical waveguide 113 may also be arranged in the ferrule (that is, the emitting component 11 Also includes ferrule). The first adjustment component 112 adjusts the first outgoing beam input from the reference single-mode optical waveguide to the second outgoing beam. When the emission component 11 includes the reference single-mode optical waveguide 113, the first adjustment component 112 may include the first medium 1121 or the second medium 1122, or not include any medium, that is, the first adjustment component 112 in FIG. 4e may be a 4a, 4b, 4c or any one of the first adjustment components 112 in FIG. 4d.

In each embodiment of the present application, optionally, the mode field diameter of the second outgoing beam is close to the fundamental mode diameter of the first multimode fiber, and the closeness may be, for example, that the mode field diameter of the second outgoing beam is the same as that of the first multimode fiber. The difference between the fundamental mode diameters of the first multimode fiber is less than or equal to a set threshold, and the threshold may be, for example, 3 μm. In one embodiment, the mode field diameter of the second outgoing beam is 14-16 μm. When the mode field diameter of the second outgoing beam is close to the mode field diameter of the multimode fiber, the mode dispersion excited by the second outgoing beam in the multimode fiber is low, and the transmission distance is long.

It can be seen from the above description that the emitting component 11 of the present invention can adjust the first outgoing beam to the second outgoing beam, so that the second outgoing beam only excites one or a few transmission modes in the multimode fiber, so as to reduce modal dispersion and increase the number of transmission modes. The bandwidth and transmission distance of the mode fiber.

Further, the present application can make adaptive modifications to the receiving component 12 of the optical module 10 . As shown in FIG. 5 , the receiving component 12 includes a second adjusting component 121, and the second adjusting component 121 is used to adjust the first incoming light beam that reaches the second adjusting component 121 through the second multimode fiber into a second incoming light beam, The diameter of the first incident beam is larger than the diameter of the second incident beam. The second adjustment component 121 can make the diameter of the second incident beam smaller than the diameter of the first incident beam by receiving only a part of the first incident beam. The second adjustment component 121 can also narrow the first incident beam so that the diameter of the second incident beam is smaller than the diameter of the first incident beam.

Optionally, the receiving component 12 may further include a photodetector (PD) 122 for converting the second incoming light beam into an electrical signal.

As shown in FIG. 5a, it is a schematic structural diagram of the first embodiment of the receiving assembly 12 provided by the present application. Wherein, the second adjustment component 121 of the receiving component 12 includes a third medium 1211, and the core diameter of the third medium 1211 close to the first end 1211a of the second multimode fiber is larger than that of the medium 1211 away from the second multimode fiber The second end 1211b. Further, the core diameter of the first end 1211a is smaller than the core diameter of the second multimode optical fiber, and is larger than the core diameter of the reference single-mode optical waveguide. The core diameter of the second end 1211b may be equal to or greater than the core diameter of the reference single-mode optical waveguide. 10˜50 μm of the first end 1211a and 9 μm of the second end 1211b in FIG. 5a are only one embodiment, and the present application is not limited thereto. Optionally, the medium 1211 is an expanded beam fiber (TEC fiber) or a tapered fiber.

As shown in FIG. 5b , it is a schematic structural diagram of the second embodiment of the receiving assembly 12 provided by the present application. The second adjustment component 121 of the receiving component 12 includes a fourth medium 1212. The diameter of the core of the fourth medium 1212 is uniform, that is, the diameter of the core of the fourth medium 1212 close to the first end 1212a of the second multimode fiber is equal to the diameter of the core of the fourth medium 1212. The fourth medium 1212 is remote from the core diameter of the second end (1212b) of the second multimode fiber. The core diameter of the fourth medium 1212 is larger than the core diameter of the reference single-mode optical waveguide, and smaller than or equal to the core diameter of the second multimode optical fiber. In one embodiment, the core diameter of the fourth medium 1212 is less than or equal to 15 μm. In another embodiment, the core diameter of the fourth medium 1212 may be less than 50 μm. 10 μm˜15 μm in FIG. 5b is only one embodiment. Further, the fourth medium 1212 can also cooperate with other devices to adjust the first incoming light beam to the second incoming light beam.

On the basis of Fig. 5a or Fig. 5b, the receiving assembly 12 may further include a lens group. For example, on the basis of FIG. 5b, as shown in FIG. 5c, a schematic structural diagram of a third embodiment of the receiving assembly 12 provided in the present application. The second adjustment component 121 may further include a second lens group 1213, the second lens group 1213 is disposed between the fourth medium 1212 and the photodetector 122, and is used for adjusting the first incoming light beam in cooperation with the fourth medium 1212 is the second incoming beam. Similarly, the lens group 1213 can also cooperate with the third medium 1211 to adjust the first incoming light beam to the second incoming light beam. The second lens group 1213 includes at least one lens. For example, the second lens group 1213 includes a collimating lens and a converging lens, the collimating lens is used to adjust the first incident beam to make the first incident beam more collimated, and the converging lens is used to condense the first incident beam to obtain a The second incoming beam received by the photodetector 122 .

In another scenario, as shown in FIG. 5d , which is a schematic structural diagram of the fourth embodiment of the receiving assembly 12 provided in this embodiment of the application, the second adjusting assembly 121 may not include a medium, but only include the second lens group 1213 , The second lens group 1213 is disposed between the second multimode fiber and the photodetector 122 , and adjusts the first incoming beam output from the second multimode fiber to the second incoming beam. Specifically, the second lens group 1213 is used to reduce the diameter of the received light beam.

Further, the receiving assembly 12 may further include a second ferrule, and the second ferrule is used for inserting a medium. For example, when the second adjustment component 121 only includes the third medium 1211 or the fourth medium 1212, the second adjustment component 121 is inserted into the second ferrule (because the medium is wrapped by the ferrule, it can also be said that the second adjustment The assembly 121 is placed inside the second ferrule). The third medium 1211 or the fourth medium 1212 may not be inserted into the ferrule, but may be installed in the receiving assembly 121 by using other firmware.

Optionally, as shown in FIG. 5e , the receiving assembly 12 may further include a reference single-mode optical waveguide 123 . In this scenario, the reference single-mode optical waveguide 123 is arranged between the second adjustment component 121 and the photodetector 122, and the reference single-mode optical waveguide 123 can be arranged in the ferrule. The second adjustment component 121 adjusts the first incident beam input from the second multimode fiber to the second incident beam. When the receiving assembly 12 includes the reference single-mode optical waveguide 123, the second adjusting assembly 121 may include the third medium 1211 or the fourth medium 1212, or not include any medium. That is, the second adjustment assembly 121 in Fig. 5e may be the second adjustment assembly 121 in any one of Figs. 5a, 5b, 5c or 5d. Using the second adjustment component shown in FIG. 5e can avoid changing the internal structure of the existing optical module and reduce the difficulty of network reconstruction.

In the above-mentioned FIG. 5 and FIGS. 5a-5e, the size of the photosensitive surface of the photodetector 122 can be adjusted so that the photodetector 122 can completely receive the second incoming beam. In one embodiment, the diameter of the photosensitive surface of the photodetector 122 is adjusted to be larger than 20 μm, for example, adjusted to 32 μm.

The receiving component 12 in the above-mentioned embodiments of the present application can adjust the received first incoming beam to the second incoming beam, that is, only selectively receive one or more modes of light from the multimode fiber, which can reduce the amount of light in different modes. The effect of the modal dispersion between them increases the bandwidth of the multimode fiber, increases the transmission rate and the transmission distance.

The mediums (eg, the first medium 1121, the second medium 1122, the third medium 1211, and the fourth medium 1212) in the above-mentioned embodiments of the present application may be usually wrapped in a casing, and the diameter and material of the casing may vary according to Selection is required, and this application does not limit it. The combination of the medium and its casing can be an optical fiber or other conductors capable of transmitting optical signals.

The transmitting component 11 and the receiving component 12 of the optical module in the present application can be arbitrarily combined from the above embodiments, so as to realize the transmission of single-mode light or light of a small number of modes in the multi-mode fiber, and increase the transmission bandwidth and the transmission bandwidth of the existing multi-mode fiber. Transmission distance.

The above is only a part of the embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements can be made without departing from the principles of the present application, and these improvements should also be regarded as the present invention. The scope of protection applied for.

Claims

An optical module, characterized in that it comprises an emission component (11), and the emission component (11) includes:

a light source (111) for outputting a first outgoing beam; the first outgoing beam is a single-mode beam;

An adjustment component (112) for adjusting the first outgoing beam to a second outgoing beam, and transmitting the second outgoing beam to a multimode fiber, wherein the mode field diameter of the second outgoing beam is larger than that of the first outgoing beam The mode field diameter of an exit beam.
The optical module according to claim 1, wherein the second outgoing beam can generate M modes in the multimode fiber, and the first outgoing beam can generate N modes in the multimode fiber, 1≤M <N.
The method according to claim 1 or 2, wherein the difference between the mode field diameter of the second outgoing beam and the fundamental mode diameter of the multimode fiber is smaller than a set threshold.
The optical module according to any one of claims 1-3, characterized in that, the adjustment component (112) comprises a lens group (1123), and the lens group (1123) is used to convert the first outgoing light beam Adjusted to the second outgoing beam.
The optical module according to any one of claims 1-3, wherein the adjustment component (112) comprises a medium, and the medium is a first medium (1121) or a second medium (1122),

The fiber core diameter of the first end (1121a) of the first medium (1121) close to the light source (111) is smaller than the fiber core diameter of the first medium (1121) close to the second end (1121b) of the multimode fiber ;

The core diameter of the second medium (1122) is larger than the core diameter of the reference single-mode optical waveguide, and smaller than or equal to the core diameter of the multi-mode optical fiber.
The optical module according to claim 5, characterized in that, the adjustment component (112) further comprises a lens group (1123), and the lens group (1123) is used to communicate with the first medium (1121) or the second medium (1121). The medium (1122) cooperates to adjust the first outgoing beam to the second outgoing beam.
The optical module according to any one of claims 1-6, characterized in that, the emission component (11) further comprises a reference single-mode optical waveguide (113),

The reference single-mode optical waveguide (113) is arranged between the light source (111) and the adjustment component (112), and the adjustment component (112) receives the first input from the reference single-mode optical waveguide. The first outgoing beam is adjusted to the second outgoing beam.
The optical module according to any one of claims 1-7, characterized in that it further comprises a compensation circuit (17), the compensation circuit (17) is used to obtain an electrical signal and adjust the electrical signal so that the The electrical signal still meets the preset requirement after being transmitted through the optical link corresponding to the optical module.
An optical module, characterized by comprising a receiving component (12), the receiving component (12) comprising:

An adjustment component (121), configured to adjust the first incoming light beam that reaches the adjusting component (121) through the multimode fiber into a second incoming light beam, where the diameter of the second incoming light beam is smaller than the diameter of the first incoming light beam .
The optical module according to claim 9, characterized in that, the receiving component (12) further comprises a photodetector (122), and the photodetector (122) is used to convert the second incoming light beam into electrical energy Signal.
The optical module according to claim 9 or 10, wherein,

The adjustment component (121) includes a lens group (1213), and the lens group (1213) is used to adjust the first incident light beam to the second incident light beam.
The optical module according to claim 9 or 10, wherein,

The adjustment assembly (121) includes a medium (1211), and the core diameter of the medium (1211) close to the first end (1211a) of the multimode optical fiber is larger than the diameter of the medium (1211) away from the multimode optical fiber. Core diameter of the second end (1211b).
The optical module according to claim 12, wherein the core diameter of the first end (1211a) of the medium (1211) is smaller than the core diameter of the multimode optical fiber.
The optical module according to claim 9 or 10, wherein the adjustment component (121) comprises a medium (1212), and the core diameter of the medium (1212) is larger than the core diameter of the reference single-mode optical waveguide, and less than or equal to the core diameter of the multimode fiber.
The optical module according to claim 12 or 13, wherein the adjustment component (121) further comprises a lens group (1213), and the lens group (1213) is used to cooperate with the medium (1211) to adjust the The first incoming light beam is adjusted to the second incoming light beam.
The optical module according to claim 14, wherein the adjustment component (121) further comprises a lens group (1213), and the lens group (1213) is used to cooperate with the medium (1212) to adjust the first An incoming beam is adjusted to the second incoming beam.
The method according to any one of claims 10-16, wherein the receiving component (12) further comprises a reference single-mode optical waveguide (123),

The reference single-mode optical waveguide (123) is arranged between the adjustment component (121) and the photodetector (122), and the adjustment component (121) transmits the second incident light beam through the reference single-mode optical waveguide. The mode optical waveguide (123) is transmitted to the photodetector (122).
The optical module according to any one of claims 11-17, characterized in that, the diameter of the photosensitive surface of the photodetector (122) is greater than 20 microns.
The optical module according to any one of claims 10-18, characterized in that it further comprises a compensation circuit (17), the compensation circuit (17) is used for acquiring an electrical signal and adjusting the electrical signal so that the The electrical signal still meets the preset requirement after being transmitted through the optical link corresponding to the optical module.
A network device, characterized by comprising the optical module according to any one of claims 1-9, and/or the optical module according to any one of claims 10-19.