CN210609185U

CN210609185U - Coherent optical module

Info

Publication number: CN210609185U
Application number: CN201922090599.3U
Authority: CN
Inventors: 叶新威; 李少雄
Original assignee: Innolight Technology Suzhou Ltd
Current assignee: Xuchuang Technology Co.,Ltd.
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-05-22
Anticipated expiration: 2029-11-28

Abstract

The application discloses a coherent optical module, which comprises a tunable laser, a coherent receiver, an optical modulator, a driver, a digital processing chip, a clock data recovery unit and a control unit. The clock data recovery unit is added in the coherent optical module, so that the transmission rate of a single electrical interface pin can be improved, and the rate regulation range can be improved by selecting the clock data recovery unit or not. The coherent optical module has a wider application range.

Description

Coherent optical module

Technical Field

The application relates to the technical field of optical communication, in particular to a coherent optical module.

Background

The coherent optical communication system is a more advanced and complex optical transmission system, and is suitable for information transmission with longer distance and larger capacity. The application of a high-order modulation format in coherent transmission enables coherent optical communication to have higher single-wavelength-channel spectrum utilization rate compared with a traditional system. The coherent receiver has no special requirements on the optical fiber channel, so that the coherent optical communication can use the laid optical fiber line. With the aid of digital signal processing algorithms, coherent receivers compensate for signal distortions caused by fiber dispersion, polarization mode dispersion, and carrier phase noise, etc., at minimal cost. The coherent receiver has a sensitivity higher than that of a general receiver by about 20dB, and thus the unrepeatered distance in the transmission system becomes long, which reduces the number of times of amplification is performed on the distance transmission optical path. For the above reasons, coherent optical communication can reduce the cost of optical fiber erection for long-distance transmission, simplify the design of optical path amplification and compensation, and become the main application technology of long-distance transmission at present.

Currently, coherent optical modules are widely used in long-distance transmission. With the development of technology, coherent optical modules may even be applied in the field of short-distance transmission. To accommodate different transmission needs, the coherent optical module can generally accommodate a variety of different transmission rates. For example, common electrical interfaces of a 100G coherent optical module include 10X10G, 1X4X10G, 2X4X10G, etc., that is, corresponding transmission rates of 100G, 40G, 80G, etc. can be transmitted. Which switches different transmission rates by using a certain number of pins of the electrical interface. Since the transmission rate of each pin for transmitting data is designed to be 10G, different transmission rates can be realized only by changing the number of pins. The range of data transmission rates that it can use to switch is relatively limited.

Disclosure of Invention

An object of the present application is to provide a coherent optical module that can expand a transmission rate by a clock data recovery unit and can select a data transmission rate in a wider range.

In order to achieve one of the above objects, the present application provides a coherent optical module, which includes a tunable laser for outputting an optical signal, a coherent receiver for receiving an external optical signal, an optical modulator for modulating the optical signal output by the tunable laser, a driver for outputting a driving signal, a digital processing chip for processing the electrical signal, a clock data recovery unit for recovering data, a control unit for controlling the operation of the optical module, and an optical port and an electrical port connected to the outside, the clock data recovery unit is connected between the electrical port and the digital processing chip, and the clock data recovery unit recovers data input from the electrical port and transmits the data to the digital processing chip, and the clock data recovery unit recovers the data sent by the digital processing chip and then transmits the data to the electric port.

In one embodiment, the coherent optical module further includes a bypass unit, the bypass unit is connected to the control unit, and the control unit controls the bypass unit to bypass the clock data recovery unit.

In one embodiment, the coherent optical module is in the form of a CFP package.

In one embodiment, the electrical port comprises a gold finger disposed on a circuit board, and the circuit board is provided with at least 20 signal transceiving pins.

In one embodiment, the circuit board is provided with 10 signal transmitting pins and 10 signal receiving pins, the clock data recovery unit is electrically connected with 8 signal transmitting pins of the 10 signal transmitting pins, and the clock data recovery unit is electrically connected with 8 signal receiving pins of the 10 signal receiving pins.

In one embodiment, the clock data recovery unit includes a sending-end clock data recovery unit and a receiving-end clock data recovery unit, the sending-end clock data recovery unit is electrically connected to 8 signal sending pins of the 10 signal sending pins, and the receiving-end clock data recovery unit is electrically connected to 8 signal receiving pins of the 10 signal receiving pins.

In one embodiment, the optical modulator and the coherent receiver are integrated.

In one embodiment, the coherent optical module further comprises an optical amplifier for amplifying the optical signal output by the modulator.

The coherent optical module of the application is added with the clock data recovery unit, so that the transmission rate of a single electrical interface pin can be improved, and the rate regulation range can be improved by selecting the clock data recovery unit or not. The coherent optical module has a wider application range.

Drawings

FIG. 1 is a schematic diagram of a coherent optical module according to an embodiment of the present application;

fig. 2 is a functional block diagram of the coherent optical module shown in fig. 1.

Detailed Description

The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.

In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.

Also, terms used herein such as "upper," "above," "lower," "below," and the like, denote relative spatial positions of one element or feature with respect to another element or feature as illustrated in the figures for ease of description. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. When an element or layer is referred to as being "on," or "connected" to another element or layer, it can be directly on, connected to, or intervening elements or layers may be present.

Referring to fig. 1 and fig. 2, an embodiment of the present application provides a coherent optical module 100. The coherent optical module 100 includes a tunable laser 110, a coherent receiver 120, an optical modulator 130, a driver 140, a digital processing chip 150, a clock data recovery unit, a control unit 190, an optical port 112, and an electrical port 114. The coherent optical module 100 is in a CFP (Form factor Pluggable) package. Of course, in other embodiments, the coherent light module 100 may also adopt other packaging forms, such as CFP2 packaging form.

The tunable laser 110 is used in this embodiment to output optical signals for the coherent optical module 100. The optical signal output by the tunable laser 110 can be adjusted in wavelength band as required to meet the actual application. The optical signal output from the tunable laser 110 may be transmitted to the optical modulator 130 via an optical fiber or other optical connection method. Optical modulator 130 receives a drive signal from driver 140 to modulate the optical signal output by tunable laser 110. The optical signal modulated by the optical modulator 130 is amplified by the optical amplifier 116 and transmitted to the optical port 112.

The coherent receiver 120 of the coherent optical module 100 is configured to receive the optical signal transmitted from the optical port 112. Coherent receiver 120 may be integrated with optical modulator 130. The coherent receiver 120 includes a photodetector and a transimpedance amplifier. Which converts the optical signal into an electrical signal. The coherent receiver 120 has one end optically connected to the optical port 112 and the other end electrically connected to the digital processing chip 150. The optical signal received by the coherent receiver 120 is converted into an electrical signal and then transmitted to the digital processing chip 150 for processing.

The digital processing chip 150 is connected to the driver 140 and is electrically connected to the electrical port 114 through the clock data recovery unit. In this embodiment, the clock data recovery unit includes a transmitting-side clock data recovery unit 160 and a receiving-side clock data recovery unit 170. The transmitting-side clock data recovery unit 160 is electrically connected to the electrical port 114 and the digital processing chip 150, respectively. The receiving-end clock data recovery unit 170 is also electrically connected to the electrical port 114 and the digital processing chip 150, respectively. Of course, the transmitting side clock data recovery unit 160 and the receiving side clock data recovery unit 170 may be integrated in other embodiments.

The coherent light module 100 further comprises a bypass unit 180. The bypass unit 180 is connected to a control unit 190. The control unit 190 controls the bypass unit 180 to bypass the clock data recovery unit connected thereto. For example, the transmitting-side clock data recovery unit 160 and the receiving-side clock data recovery unit 170 are both connected to the bypass unit 180, so that the control unit 190 can control whether to access the clock data recovery unit through the bypass unit 160, thereby switching between different data transmission rates.

The optical port 112 of the coherent optical module 100 is typically an optical fiber connector, so that the optical port 112 can be connected to other components via a patch fiber. The number of the optical ports may be one or more. The electrical port 114 includes a gold finger disposed on the circuit board. That is, the electrical port 114 is electrically connected to the outside by forming a gold finger on the circuit board, so that the electrical port can be connected to the external component in a pluggable manner. Of course in other embodiments the electrical interface may exist in other formations than gold fingers. In this embodiment, the circuit board is provided with at least 20 signal transceiving pins. The 20 signal transceiving pins include 10 signal transmitting pins and 10 signal receiving pins. The transmitting-end clock data recovery unit 160 is electrically connected to 8 signal transmission pins among the 10 signal transmission pins, and the receiving-end clock data recovery unit 170 is electrically connected to 8 signal reception pins among the 10 signal reception pins. Such a connection can achieve the actual transmission rate requirements. For example, when the coherent optical module needs to transmit data at a rate of 100G/s, 10 pins of each of the transmitting end and the receiving end can be used for transmission. At this time, the data transfer rate of each pin is 10G/s. When the optical module needs to transmit data at a rate of 200G/s, 8 pins of each of the transmitting end and the receiving end can be used for transmission. At this time, the data transfer rate of each pin is 25G/s. The existence of the clock data recovery unit can improve the data transmission rate and prevent signal degradation. Thereby enabling the optical module to support a transmission rate of 200G/s or higher.

It should be noted that, only 10 signal transmitting pins and 10 signal receiving pins are illustrated here. Those skilled in the art will appreciate that the coherent optical module may also use more or fewer pins to achieve the transmission of data, and the need for different transmission rates. Of course, switching of the required transmission rate may also be achieved by bypassing more or fewer pins.

According to the coherent optical module, the clock data recovery unit is added between the digital processing chip and the electrical interface, so that the clock data recovery unit can improve the data transmission rate of a pin connected with the clock data recovery unit in the electrical interface, and the coherent optical module can transmit data with higher rate. The coherent optical module also has a bypass unit capable of bypassing the clock data recovery unit. When the transmission rate needs to be switched, the clock data recovery unit can be bypassed by the bypass unit. Therefore, the coherent optical module can improve the range of rate adjustment by selecting the clock data recovery unit or not. The coherent optical module has a wider application range.

The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.

Claims

1. A coherent optical module is characterized by comprising a tunable laser used for outputting optical signals, a coherent receiver used for receiving external optical signals, an optical modulator used for modulating the optical signals output by the tunable laser, a driver used for outputting driving signals, a digital processing chip used for processing the electric signals, a clock data recovery unit used for recovering and processing data, a control unit used for controlling the work of the optical module, and an optical port and an electric port which are connected with the outside, wherein the clock data recovery unit is connected between the electric port and the digital processing chip, the clock data recovery unit is used for recovering and processing the data input from the electric port and then transmitting the data to the digital processing chip, and the clock data recovery unit is used for recovering and transmitting the data sent by the digital processing chip to the electric port.

2. The coherent optical module of claim 1, wherein: the coherent optical module further comprises a bypass unit, the bypass unit is connected with the control unit, and the control unit controls the bypass unit to bypass the clock data recovery unit.

3. The coherent optical module of claim 2, wherein: the coherent optical module adopts a CFP packaging form.

4. The coherent optical module of claim 2, wherein: the electric port comprises a gold finger arranged on a circuit board, and at least 20 signal receiving and transmitting pins are arranged on the circuit board.

5. The coherent optical module of claim 4, wherein: the circuit board is provided with 10 signal transmitting pins and 10 signal receiving pins, the clock data recovery unit is electrically connected with 8 signal transmitting pins in the 10 signal transmitting pins, and the clock data recovery unit is electrically connected with 8 signal receiving pins in the 10 signal receiving pins.

6. The coherent optical module of claim 5, wherein: the clock data recovery unit comprises a sending end clock data recovery unit and a receiving end clock data recovery unit, the sending end clock data recovery unit is electrically connected with 8 signal sending pins in the 10 signal sending pins, and the receiving end clock data recovery unit is electrically connected with 8 signal receiving pins in the 10 signal receiving pins.

7. The coherent optical module of claim 2, wherein: the optical modulator and the coherent receiver are integrated.

8. The coherent optical module of claim 2, wherein: the coherent optical module further comprises an optical amplifier for amplifying the optical signal output by the modulator.