System and method for enabling same optical port to be compatible with optical link service transmission and channel detection

Abstract

The invention discloses a system and a method for compatible optical link service transmission and channel detection at the same optical port, and the method comprises the following steps: arranging a high-speed eight-channel repeater chip in an optical fiber link, and calling three channels of 1-input and 2-output, so that the optical fiber link can be automatically switched between optical fiber service transmission and optical fiber channel detection according to an instruction; continuously monitoring the state of an optical fiber channel in an optical fiber service transmission process; when the state of the optical fiber channel is judged to be LOS, the state is automatically switched to an optical fiber channel detection state, an optical fiber link is detected through an OTDR optical link detection unit, and fault judgment is carried out based on detection data; and when the state of the optical fiber channel returns to normal, automatically switching to an optical fiber service transmission state, and continuing service transmission. The system and the method for compatible optical link service transmission and channel detection at the same optical port can be compatible with two functions of optical link service transmission and channel detection at the same time, and are high in use flexibility, low in use cost and convenient to use.

Description

Technical Field

[0001] The present invention relates to the field of optical fiber communication technology, and in particular to a system and method for compatible optical link service transmission and channel detection on the same optical port. Background Art

[0002] In optical fiber communication transmission technology, in general, the optical fiber transmission interface only has the business transmission function, and the same optical port cannot support the optical link detection function. When an optical fiber link fails, the operator needs to go to the site to unplug the optical fiber and then connect a handheld OTDR detection instrument to perform fault detection.

[0003] In the prior art, optical fiber transmission terminals with optical link detection functions usually use optical splitters and wave concentrators to detect communication quality, or use optical switches to switch optical paths on optical fiber channels to detect;

[0004] In the first method, light of different wavelengths is transmitted in the same optical fiber link. Due to the access of additional optical devices of different wavelengths, the signal light quality is degraded and interference occurs between signals. In addition, due to the limitation of FWDM optical devices, the monitoring wavelength of OTDR must avoid the band where the communication light is located. The wavelength cannot be selected arbitrarily, which is inconvenient to use.

[0005] In the second method, the optical path is switched from the optical fiber channel, usually using 1x2 optical switches, 2x2 optical switches, 2xN optical switches, etc., or even optical switches with more channels. On the one hand, optical switches are very expensive, and optical switches are easily damaged and consumable, so the cost of use and maintenance will be relatively high; on the other hand, optical switches are large in size, and the larger the number of optical switches, the larger the size will be, which does not conform to the development trend of integration and miniaturization, and also has the problem of inconvenience in use; thirdly, optical switches are generally implemented using electromechanical systems (MEMS), and there are multiple instructions issued at the same time, which has problems such as easy damage, low sensitivity, and slow response speed. Summary of the invention

[0006] The embodiments of the present application provide a system and method for the same optical port to be compatible with optical link service transmission and channel detection. The system and method can be compatible with both optical link service transmission and channel detection functions, and can work with optical signals of the same band at the same time. There is no problem of mutual interference between signals, and the system has high flexibility, low cost and is easy to use.

[0007] A first aspect of an embodiment of the present application provides a method for compatible optical link service transmission and channel detection on the same optical port, comprising the following steps:

[0008] A repeater chip is placed in the optical fiber link, and its three channels (1 input and 2 output) are used to enable the optical fiber link to automatically switch between optical fiber service transmission and optical fiber channel detection according to instructions;

[0009] Continuously monitor the status of the fiber channel during fiber service transmission;

[0010] When the fiber channel status is judged to be LOS, it automatically switches to the fiber channel detection status, detects the fiber link through the OTDR optical link detection unit, and makes a fault judgment based on the detection data;

[0011] When the state of the fiber channel returns to normal, that is, returns to the fiber service transmission state, it automatically switches to the fiber service transmission state and continues service transmission.

[0012] In a possible implementation, optical fiber service transmission is performed through an FPGA optical link service processing unit, the state of the optical fiber channel is determined through an optical module, and the fault result of the optical fiber link unit by the OTDR is received through a CPU control unit and then uploaded to the network management of the optical fiber transmission terminal. The network management displays the distance at which the optical fiber is broken or the optical signal is blocked, and the CPU control unit sends corresponding instructions to the repeater chip according to the judgment of the optical module.

[0013] A second aspect of an embodiment of the present application provides a system for compatible optical link service transmission and channel detection on the same optical port, which is used to implement the method for compatible optical link service transmission and channel detection on the same optical port as described above. The system includes an optical module unit, a repeater chip, an FPGA optical link service processing unit and an OTDR optical link detection unit arranged in an optical fiber link, wherein the optical module unit is close to the optical interface of the optical fiber link and performs optical transmission and reception with the optical interface, wherein the optical module unit is respectively connected to the FPGA optical link service processing unit and the OTDR optical link detection unit through the repeater chip, and a CPU control unit is connected between the repeater chip and the OTDR optical link detection unit through a bus, so that the repeater chip can switch the channel of the optical fiber link between the FPGA optical link service processing unit and the OTDR optical link detection unit according to the instructions of the CPU control unit.

[0014] In a possible implementation, the repeater chip is a high-speed eight-channel repeater chip.

[0015] In one possible implementation, the Serdes input port of the optical module is connected to the repeater chip, the first branch of the repeater chip is disconnected or connected to the Serdes port of the FPGA optical link service processing unit, and the second branch of the repeater chip is disconnected or connected to the Serdes port of the OTDR optical link detection unit.

[0016] In a possible implementation, the high-speed eight-channel repeater chip is composed of two-stage CTLEs, and the working mode of the two-stage CTLE space division crossover is configured through a register.

[0017] Beneficial effect: Compared with the prior art, the system and method for compatible optical link service transmission and channel detection on the same optical port provided by the present application realizes automatic channel switching between optical fiber service transmission and optical fiber channel detection using the same band on the same optical port through a repeater chip, is not affected by optical signal interference, has high switching accuracy, high response sensitivity, and faster response, and at the same time has low cost, small size, and is more convenient to use and maintain.

[0018] These and other objects, features and advantages of the present invention will be fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram shows the principle of the method for the same optical port compatible optical link service transmission and channel detection of the present application. DETAILED DESCRIPTION

[0020] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0021] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0022] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0023] refer to Figure 1 The embodiment of the present application provides a method for compatible optical link service transmission and channel detection on the same optical port, comprising the following steps:

[0024] A repeater chip is placed in the optical fiber link, and its three channels (1 input and 2 output) are used to enable the optical fiber link to automatically switch between optical fiber service transmission and optical fiber channel detection according to instructions;

[0025] Continuously monitor the status of the fiber channel during the fiber service transmission process to continuously determine whether the fiber channel can transmit services normally or has a transmission failure problem;

[0026] When the state of the optical fiber channel is judged to be LOS, that is, a communication failure occurs, it automatically switches to the optical fiber channel detection state, detects the optical fiber link through the OTDR optical link detection unit, and makes a fault judgment based on the detection data;

[0027] After the optical fiber fault is repaired, when the state of the optical fiber channel returns to normal, that is, when it returns to the optical fiber business transmission state, it automatically switches to the optical fiber business transmission state and continues business transmission.

[0028] Therefore, the method for compatible optical link service transmission and channel detection on the same optical port provided by the present application successfully realizes the two functions of optical fiber service transmission and optical fiber channel detection at the same time using the same wavelength band (such as 1550nm) on the same optical port. That is to say, wavelength division multiplexing technology is no longer used, and there is no situation of combining and splitting waves. There is no problem of signal light quality degradation and interference between signals caused by the use of splitters and wave concentrators. At the same time, it also solves the problems of large size, high price, and easy loss of conventional optical switches, and has higher switching accuracy and switching sensitivity and faster response.

[0029] Among them, in the method of compatible optical link service transmission and channel detection on the same optical port provided in the present application, optical fiber service transmission is performed through the FPGA optical link service processing unit, and the state of the optical fiber channel is judged by the optical module, that is, whether it is a normal transmission state or a transmission failure state. The fault result of the OTDR on the optical fiber link unit is received by the CPU control unit, and then uploaded to the network management of the optical fiber transmission terminal, and the network management displays the distance at which the optical fiber is broken or the optical signal is blocked. The CPU control unit sends corresponding instructions to the repeater chip according to the judgment of the optical module, so there is no problem of multiple instructions being superimposed. It is based on switching electrical signals in the circuit of the PCB board, thereby ensuring higher sensitivity, switching accuracy and response speed. In addition, the repeater chip supports standard and fast I2C protocols, as well as SMBus data transmission instructions, and can be compatible with various types of CPUs and FPGAs for use, and has a wider range of applications.

[0030] Based on the same working principle, the second aspect of the embodiment of the present application provides a system for compatible optical link service transmission and channel detection of the same optical port, which is used to implement the method for compatible optical link service transmission and channel detection of the same optical port as described above. The system includes an optical module unit, a repeater chip, an FPGA optical link service processing unit and an OTDR optical link detection unit arranged in an optical fiber link, wherein the optical module unit is close to the optical interface of the optical fiber link, and performs optical transmission and optical reception with the optical interface, so as to realize operation in the same optical port and in the same band, wherein the optical module unit is respectively connected to the FPGA optical link service processing unit and the OTDR optical link detection unit through the repeater chip, and a CPU control unit is connected between the repeater chip and the OTDR optical link detection unit through a bus, so that the repeater chip can switch the optical fiber link between the FPGA optical link service processing unit and the OTDR optical link detection unit according to the instruction of the CPU control unit.

[0031] Further preferably, the Serdes input port of the optical module is connected to the repeater chip, and at the same time, the first branch of the repeater chip is disconnected or connected to the Serdes port of the FPGA optical link service processing unit, and at the same time, the second branch of the repeater chip is disconnected or connected to the Serdes port of the OTDR optical link detection unit, so that the repeater chip can perform channel switching between the FPGA optical link service processing unit and the OTDR optical link detection unit to realize service transmission or channel detection of the optical link.

[0032] When the optical module determines that the optical fiber channel is LOS, the CPU control unit issues an instruction to the repeater chip to switch the channel, connect the Serdes port of the optical module to the Serdes port of the OTDR optical link detection unit, and the OTDR optical link detection unit detects the optical fiber link, makes a fault judgment based on the detection data, and uploads the fault judgment result to the CPU control unit. After receiving the fault result of the OTDR optical link detection unit, the CPU control unit uploads it to the network management of the optical fiber transmission terminal, and the network management will display the distance at which the optical fiber is broken or the optical signal is blocked;

[0033] After the optical fiber maintenance is completed, the optical module will no longer send out an alarm signal. The CPU control unit automatically issues instructions to the repeater chip. The repeater chip switches channels and connects the Serdes port of the optical module to the Serdes port of the FPGA optical link service processing unit to continue service transmission. This achieves compatibility of both service transmission and channel detection functions on the same optical port. Wavelength division multiplexing technology is no longer used, so there is no combination and division of waves. There is no problem of signal light quality degradation and interference between signals caused by the use of splitters and wave concentrators. At the same time, it also solves the problems of large size, high price, and easy loss of conventional optical switches. This method has higher switching accuracy and switching sensitivity and faster response.

[0034] In one embodiment, the repeater chip is a high-speed eight-channel repeater chip, and the high-speed eight-channel repeater chip is composed of two-stage CTLE, which can be configured through registers. The working mode of the space division cross can be configured through the register: for example, straight-through, two-choice, one-to-two fan-out, and two-to-two crossover mode.

[0035] The function of an 8x8 optical switch is accomplished through a high-speed eight-channel repeater chip. The price of an 8x8 optical switch on the market is usually tens of thousands or even hundreds of thousands of yuan, while a high-speed eight-channel repeater chip only costs tens of yuan, reducing the cost by almost tens of thousands of times. At the same time, the size of a high-speed eight-channel repeater chip is generally 1.3cm x 0.8cm, which is more in line with the development trend of integration and miniaturization. It is more convenient to use and easy to promote and apply throughout the country, so as to promote the technical evolution of combining optical channel detection with business transmission.

[0036] In the high-speed eight-channel repeater chip, the eight channels form four 2x2 space-division crossbar switches, realizing 2:1 multiplexing selection and 1:2 fan-out functions, which are suitable for redundant switching. The crossbar switches can be controlled by pins or registers and used in concurrent selection to complete the switching of Serdes signals. This application scenario is the first of its kind.

[0037] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A method for compatible optical link service transmission and channel detection on the same optical port, characterized in that: The following steps are involved: A repeater chip is placed in the optical fiber link, and its three channels (1 input and 2 output) are used to enable the optical fiber link to automatically switch between optical fiber service transmission and optical fiber channel detection according to instructions; Continuously monitor the status of the fiber channel during fiber service transmission; When the fiber channel status is judged to be LOS, it automatically switches to the fiber channel detection status, detects the fiber link through the OTDR optical link detection unit, and makes a fault judgment based on the detection data; When the state of the fiber channel returns to normal, that is, returns to the fiber service transmission state, it automatically switches to the fiber service transmission state and continues service transmission.

2. The method for compatible optical link service transmission and channel detection on the same optical port as claimed in claim 1, characterized in that: Optical fiber service transmission is performed through the FPGA optical link service processing unit, the optical module is used to determine the status of the optical fiber channel, the CPU control unit receives the OTDR fault result for the optical fiber link unit, and then uploads it to the network management of the optical fiber transmission terminal. The network management displays the distance at which the optical fiber is broken or the optical signal is blocked. The CPU control unit sends corresponding instructions to the repeater chip based on the judgment of the optical module.

3. A system for compatible optical link service transmission and channel detection on the same optical port, used to implement the method for compatible optical link service transmission and channel detection on the same optical port as claimed in claim 2, characterized in that: The system includes an optical module unit, a repeater chip, a FPGA optical link service processing unit and an OTDR optical link detection unit arranged in an optical fiber link, wherein the optical module unit is close to an optical interface of the optical fiber link and performs optical transmission and reception with the optical interface, wherein the optical module unit is respectively connected to the FPGA optical link service processing unit and the OTDR optical link detection unit through the repeater chip, and a CPU control unit is connected between the repeater chip and the OTDR optical link detection unit through a bus, so that the repeater chip can switch channels between the FPGA optical link service processing unit and the OTDR optical link detection unit according to instructions of the CPU control unit.

4. The system for compatible optical link service transmission and channel detection on the same optical port as claimed in claim 3, characterized in that: The repeater chip is a high-speed eight-channel repeater chip.

5. The system for compatible optical link service transmission and channel detection on the same optical port as claimed in claim 4, characterized in that: The Serdes input port of the optical module is connected to the repeater chip, the first branch of the repeater chip is disconnected or connected to the Serdes port of the FPGA optical link service processing unit, and the second branch of the repeater chip is disconnected or connected to the Serdes port of the OTDR optical link detection unit.

6. The system for compatible optical link service transmission and channel detection on the same optical port as claimed in claim 4, characterized in that: The high-speed eight-channel repeater chip is composed of two-stage CTLEs, and the working mode of the two-stage CTLE space division cross is configured through registers.

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