WO2020062139A1 - Optical terminal multiplexer, control method, and wavelength division multiplexing system - Google Patents

Abstract

Disclosed are an optical terminal multiplexer, a control method, and a wavelength division multiplexing system for reducing a link insertion loss and improving system performance. The optical terminal multiplexer in the present application comprises: a (C+L) waveband optical signal demultiplexing unit, a (C+L) waveband optical signal multiplexing unit, a C waveband optical amplifier, a first L waveband fiber interface unit, a second L waveband fiber interface unit, an L waveband optical amplifier, and an L waveband optical monitoring unit, wherein two fiber interface units of an input end and an output end of the C waveband optical amplifier are removed, and the C waveband optical amplifier can filter a crosstalk L waveband optical signal, so that insertion losses of the two fiber interface units of the input end and the output end of the C waveband optical amplifier are eliminated in the optical terminal multiplexer so as to improve the system performance.

Description

Optical terminal multiplexer, control method and wavelength division multiplexing system Technical field

The present application relates to the field of optical communication technologies, and in particular, to an optical terminal multiplexer, a control method, and a wavelength division multiplexing system.

Background technique

A dense wavelength division multiplexing (DWDM) system is a large-capacity wavelength division multiplexing system. The DWDM system is based on the available spectrum of the optical fiber, and realizes multi-wave transmission by precisely controlling the wavelength of the channel. At present, the DWDM system uses the C-band, and its wavelength is between 1525nm and 1565nm. With the continuous expansion of the system capacity requirements of the DWDM system, increasing the spectral width of the available optical fiber spectrum is one of the improvements in the system capacity of the DWDM system. An important means. In the C-band DWDM system, an L-band (wavelength between 1570nm-1610nm) spectrum is added for multi-wave transmission to increase the spectrum width to improve the system capacity in the DWDM system.

The stimulated Raman scattering (SRS) effect is a physical phenomenon in which signals of different wavelengths are transmitted in the same fiber, and short-wavelength energy is transferred to long-wavelength energy. In the current (C + L) DWDM system, because the wavelength of the C-band is shorter than the wavelength of the L-band, when the L-band optical signal and the C-band optical signal are transmitted in the same fiber, the C-band energy will be transferred to the L-band. In the C + L) -band transmission system, the C-band optical signal-to-noise ratio (OSNR) performance is degraded, and the transmission distance is reduced.

(C + L) DWDM system Compared with pure CDWDM system, (C + L) DWDM system has redundant (C + L) WDM devices and SRS effect, which results in poor system performance of (C + L) DWDM system. In the existing conventional (C + L) DWDM system, the C-band corresponding fiber interface unit (FIU) cannot be removed. The reason is that the L-band light will leak to the C-band, resulting in the C-band corresponding light. Amplification unit (optical amplifier) control error.

Summary of the Invention

In order to achieve the technical purpose of removing the FIU corresponding to the C-band in the (C + L) DWDM system, and at the same time ensuring that the OA unit corresponding to the C-band is normally controlled, the following technical solution is provided in the implementation of this application:

The first aspect of the present application provides an optical terminal multiplexer, including: (C + L) band optical signal demultiplexing unit, (C + L) band optical signal multiplexing unit, C band optical amplifier unit, first L-band fiber interface unit, second L-band fiber interface unit, L-band optical amplifier unit, and L-band optical monitoring unit;

An output end of the (C + L) -band optical signal demultiplexing unit is connected to an input end of the C-band optical amplification unit, and an output end of the C-band optical amplification unit is connected to the (C + L) ) One input end of the optical signal multiplexing unit is connected; the other output end of the (C + L) band optical signal demultiplexing unit is connected to the input end of the first L-band optical fiber interface unit, and the first The output ends of an L-band optical fiber interface unit are respectively connected to the input ends of the L-band optical amplification unit and the L-band optical monitoring unit, and the outputs of the L-band optical amplification unit and the L-band optical monitoring unit Terminals are respectively connected to the input ends of the second L-band optical fiber interface unit, and the output ends of the second L-band optical fiber interface unit are connected to the other input ends of the (C + L) -band optical signal multiplexing unit;

The (C + L) band optical signal demultiplexing unit is configured to receive a first multiplexed optical signal corresponding to the C band and the L band and perform a demultiplexing operation on the first multiplexed signal to obtain a C band optical signal. And L-band optical signals;

The L-band optical monitoring unit monitors the L-band signal output through the first L-band optical fiber interface unit;

The C-band optical amplification unit and the L-band optical amplification unit are respectively configured to perform a demultiplexing operation on the first multiplexed signal by the (C + L) band optical signal demultiplexing unit to obtain C Amplify the optical signal in the L-band and the optical signal in the L-band, wherein the C-band optical amplifying unit has a function of filtering the L-band optical signal of crosstalk in the C-band optical signal;

The (C + L) -band optical signal multiplexing unit is configured to perform a multiplexing operation on the amplified C-band optical signal and the L-band optical signal to obtain a second multiplexed optical signal and send the second multiplexed optical signal. .

From the above technical solutions, it can be seen that the embodiment of the present application has the following advantages: compared with the conventional wavelength division multiplexing system, the two fiber interface units at the input end and the output end of the C-band optical amplifier unit are removed, and the C-band The optical amplifying unit can filter out the L-band optical signals of crosstalk, so that the optical terminal multiplexer eliminates the insertion loss of the two optical fiber interface units at the input end and the output end of the C-band optical amplifying unit, thereby improving system performance.

With reference to the first aspect of the present application, in a first possible implementation manner of the first aspect of the present application, the C-band optical amplification unit includes an L-band filter, wherein the L-band filter is used to filter C-band light L-band optical signal with crosstalk in the signal.

With reference to the first aspect of the present application, in a second possible implementation manner of the first aspect of the present application, the optical terminal multiplexer further includes: an optical power calculation unit, where the optical power calculation unit and the The C-band optical amplifier unit is connected to the L-band optical amplifier unit, and the optical power calculation unit is configured to calculate the optical power value of the L-band optical signal of crosstalk in the C-band optical signal and input the calculation result into the C-band optical amplifier. In the amplifying unit, the calculation result is used for the C-band optical amplifying unit to filter the L-band optical signal of crosstalk in the C-band optical signal.

With reference to the first aspect of the present application, the first possible implementation manner of the first aspect of the present application, or the second possible implementation manner of the first aspect of the present application, in the third possible implementation manner of the first aspect of the present application The optical terminal multiplexer further includes: a (C + L) -band Raman amplifier and a C-band optical fiber interface unit, wherein the (C + L) -band Raman amplifier is provided at the (C + L) An input end of a band optical signal demultiplexing unit is configured to receive the first multiplexed optical signal and amplify the first multiplexed optical signal and input the (C + L) band optical signal demultiplexing unit. The C-band optical fiber interface unit is disposed between an output end of the C-band optical amplification unit and an input end of the (C + L) -band optical signal multiplexing unit.

With reference to the first possible implementation manner of the first aspect of the present application, in a fourth possible implementation manner of the first aspect of the present application, the C-band optical amplification unit further includes a PIN diode, and the L-band filtering Integrated in the PIN-type diode.

With reference to the first possible implementation manner of the first aspect of the present application, in a fifth possible implementation manner of the first aspect of the present application, the C-band optical amplifying unit further includes a PIN diode and a beam splitter. An L-band filter is provided between the PIN diode and the beam splitter.

With reference to the second possible implementation manner of the first aspect of the present application, in a sixth possible implementation manner of the first aspect of the present application, the optical power calculation unit includes an L-band spectrum detection module, and the L-band spectrum The detection module is configured to detect an output spectrum of the L-band optical amplification unit.

A second aspect of the present application provides a control method, including: controlling a (C + L) -band optical signal demultiplexing unit to receive a first multiplexed optical signal in a C-band and an L-band, the (C + L) -band optical signal A signal demultiplexing unit configured to perform a demultiplexing operation on the first multiplexed optical signal to obtain a C-band optical signal and an L-band optical signal;

Control the C-band optical amplifier unit to directly amplify the C-band optical signal output by the (C + L) -band optical signal demultiplexing unit, and directly output the amplified C-band optical signal to (C + L) -band light A signal multiplexing unit, wherein the C-band optical amplifying unit has a function of filtering an L-band optical signal of crosstalk in the C-band optical signal;

Controlling the L-band optical monitoring unit to monitor the L-band signal output through the first L-band fiber interface unit;

Control the C-band optical amplifier unit to amplify the L-band signal output through the first L-band fiber interface unit, and output the amplified L-band signal to the (C + L) band light through the second L-band fiber interface unit A signal multiplexing unit, the (C + L) band optical signal multiplexing unit is configured to perform a multiplexing operation on the amplified C-band optical signal and the L-band optical signal to obtain a second multiplexed signal and send the second complex signal With signal.

With reference to the second aspect of the present application, in a first possible implementation manner of the second aspect of the present application, the C-band optical amplification unit includes an L-band filter, wherein the L-band filter is used to filter C-band light L-band optical signal with crosstalk in the signal.

With reference to the second aspect of the present application, in a second possible implementation manner of the second aspect of the present application, the control method further includes: controlling the optical power calculation unit to calculate the optical power of the L-band optical signal of the crosstalk in the C-band optical signal Value and input the calculation result into the C-band optical amplification unit, and the calculation result is used for the C-band optical amplification unit to filter the L-band optical signal of crosstalk in the C-band optical signal.

With reference to the second aspect of the present application, the first possible implementation manner of the second aspect of the present application, or the second possible implementation manner of the second aspect of the present application, in the third possible implementation manner of the second aspect of the present application The optical terminal multiplexer further includes: a (C + L) -band Raman amplifier and a C-band optical fiber interface unit, wherein the (C + L) -band Raman amplifier is provided at the (C + L) An input end of a band optical signal demultiplexing unit is configured to receive the first multiplexed optical signal and amplify the first multiplexed optical signal and input the (C + L) band optical signal demultiplexing unit. The C-band optical fiber interface unit is disposed between an output end of the C-band optical amplification unit and an input end of the (C + L) -band optical signal multiplexing unit.

With reference to the first possible implementation manner of the second aspect of the present application, in a fourth possible implementation manner of the second aspect of the present application, the C-band optical amplifier unit further includes a PIN-type diode, and the L-band filter Integrated in the PIN-type diode.

With reference to the first possible implementation manner of the second aspect of the present application, in a fifth possible implementation manner of the second aspect of the present application, the C-band optical amplifying unit further includes a PIN diode and a beam splitter. An L-band filter is provided between the PIN diode and the beam splitter.

With reference to the second possible implementation manner of the second aspect of the present application, in a sixth possible implementation manner of the second aspect of the present application, the optical power calculation unit includes an L-band spectrum detection module, and the L-band spectrum The detection module is configured to detect an output spectrum of the L-band optical amplification unit.

A third aspect of the present application provides a wavelength division multiplexing system, where the wavelength division multiplexing system includes at least two of the first aspect and any one of the possible implementation manners of the first aspect. Terminal multiplexer.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to explain the technical solutions of the embodiments of the present application more clearly, the accompanying drawings used in the description of the embodiments are briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings according to these drawings without paying creative labor.

FIG. 1 is a schematic diagram of an embodiment of an optical terminal multiplexer in a non-Raman scenario according to an embodiment of the present application; FIG.

2 is a schematic diagram of an embodiment of an optical amplifier unit corresponding to an optical terminal multiplexer in an embodiment of the present application;

3 is a schematic diagram of an embodiment of an optical power calculation unit corresponding to an optical terminal multiplexer in an embodiment of the present application;

4 is a schematic diagram of an embodiment of an optical terminal multiplexer in a Raman scenario according to an embodiment of the present application;

5 is a schematic diagram of an embodiment of a wavelength division multiplexing system in a non-Raman scenario according to an embodiment of the present application;

6 is a schematic diagram of an embodiment of a wavelength division multiplexing system in a Raman scenario according to an embodiment of the present application;

FIG. 7 is a schematic diagram of an embodiment of a control method in an embodiment of the present application.

detailed description

The following describes the embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Those of ordinary skill in the art may know that with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

This application provides an optical terminal multiplexer, a control method, and a wavelength division multiplexing system, which are used to reduce link insertion loss and improve system performance. Each of them will be described in detail below. The term "and / or" appearing in this application can be an association relationship describing an associated object, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this application generally indicates that the related objects before and after are an "or" relationship.

The terms "first" and "second" in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way are interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than what is illustrated or described herein. Furthermore, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or device that includes a series of steps or modules need not be limited to those explicitly listed Those steps or modules may instead include other steps or modules not explicitly listed or inherent to these processes, methods, products or equipment. The naming or numbering of steps in this application does not mean that the steps in the method flow must be executed in the time / logical order indicated by the naming or numbering. The named or numbered process steps can be implemented according to the Technical purposes change the execution order, as long as the same or similar technical effects can be achieved. The division of modules appearing in this application is a logical division. In actual applications, there can be other divisions. For example, multiple modules can be combined or integrated in another system, or some features can be ignored. , Or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces. The indirect coupling or communication connection between the modules may be electrical or other similar forms. There are no restrictions in the application. In addition, the modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed into multiple circuit modules, and some or all of them may be selected according to actual needs. Module to achieve the purpose of the solution of this application.

The embodiments of the present application are applicable to the system architecture of a (C + L) -band DWDM system, so as to reduce the loss of the (C + L) -band DWDM system, improve system performance, and achieve high-performance multi-wave transmission.

In order to facilitate the detailed description of the embodiments of the present application, some device names involved in the embodiments of the present application are described below as follows:

Optical terminal multiplexers include, but are not limited to, optical terminal multiplexers (OTM);

The optical signal multiplexing unit and the optical signal demultiplexing unit include, but are not limited to, a wavelength division dense multiplexing (WDM) unit. When a WDM unit is used to perform a multiplexing operation, the WDM unit can be regarded as an optical signal Multiplexing unit. When a WDM unit is used to perform a demultiplexing operation, the WDM unit can be regarded as an optical signal demultiplexing unit. The WDM unit can be divided according to the band, and can be specifically divided as described in the embodiments of this application. C + L) band optical signal demultiplexing unit and (C + L) band optical signal multiplexing unit, and both can be expressed as (C + L) WDM;

The optical amplifying unit includes, but is not limited to, an OA unit. The OA unit may include erbium-doped fiber amplifier (EDFA) and other devices with amplifying functions. It is easy to understand that the OA unit can be processed according to the amplified optical signal band. The division may be specifically divided into a C-band optical amplifier unit (that is, OA-C) and an L-band optical amplifier unit (that is, OA-L) in the embodiments of the present application;

The optical fiber interface unit includes, but is not limited to, a fiber interface unit (FIU). Among them, the FIU has a filtering function. When the FIU is used to filter a C-band optical signal, the FIU can be regarded as a C-band FIU, which is referred to as FIU- C, when FIU is used to filter the L-band optical signal, FIU can be regarded as L-band FIU and recorded as FIU-L;

The optical monitoring unit includes, but is not limited to, an optical monitoring channel (OSC) unit. In the embodiment of the present application, the OSC unit may be divided into a C-band OSC unit (that is, OSC-C) and an L-band OSC unit (that is, OSC -L).

FIG. 1 is a schematic diagram of an embodiment of an optical terminal multiplexer according to an embodiment of the present application.

As shown in FIG. 1, the optical terminal multiplexer in the embodiment of the present application includes:

(C + L) WDM unit 101, OA-C unit 102, first FIU-L unit 103, second FIU-L unit 104, OA-L unit 105, OSC-L unit 106, and (C + L) WDM unit 107, where (C + L) WDM unit 101 is an optical signal demultiplexing unit, (C + L) WDM unit 101 is used to perform a demultiplexing operation, and (C + L) WDM unit 107 is an optical signal multiplexing unit The (C + L) WDM unit 107 is configured to perform a multiplexing operation.

In the optical terminal multiplexer OTM shown in FIG. 1, (C + L) WDM unit 101 is configured to receive a first multiplexed optical signal corresponding to the C-band and L-band, where the first multiplexed optical signal is a After the optical signal corresponding to the wavelength in the C-band and the optical signal corresponding to the wavelength in the L-band are multiplexed to form a signal, the multiplexed optical signal transmitted in the same optical fiber, and the (C + L) WDM unit 101 can also A multiplexed optical signal is demultiplexed to obtain a C-band optical signal and an L-band optical signal.

(C + L) The C-band signal output terminal (ie TC terminal) of WDM unit 101 is directly connected to the input terminal (ie IN terminal) of OA-C unit 102, and the output terminal (ie OUT terminal) of OA-C unit 102 is connected to The (C + L) C-band signal input terminal (ie, the RC terminal) of the WDM unit 107 is directly connected. When the (C + L) WDM unit 101 receives the first multiplexed optical signal, the first multiplexed optical signal is demultiplexed into a C-band optical signal and an L-band optical signal after passing through the (C + L) WDM unit 101. The C-band optical signal is output from the TC terminal of the (C + L) WDM unit 101 to the IN terminal of the OA-C unit 102 and reaches the OA-C unit 102. Furthermore, the C-band optical signal is amplified by the OA-C unit 102 and amplified. The subsequent C-band optical signal is output from the OUT terminal of the OA-C unit 102 to the RC terminal of the (C + L) WDM unit 107 and reaches the (C + L) WDM unit 107.

(C + L) The L-band signal output terminal (ie, TL terminal) of the WDM unit 101 is connected to the input terminal (ie, IN terminal) of the first FIU-L unit 103, and the two output terminals of the first FIU-L unit 103: The TL terminal and the TML terminal are connected to the input terminal (that is, the IN terminal) of the OA-L unit 105 and the input terminal (that is, the IN terminal) of the OSC-L unit 106. Similarly, the second FIU-L unit 104 has two input terminals. : RL and RML, the output (ie OUT) of the OA-L unit 105 and the output (ie OUT) of the OSC-L unit 106 are connected to the RL and RML ends of the second FIU-L unit 104, respectively The output terminal (ie, the OUT terminal) of the second FIU-L unit 104 is connected to the L-band signal input terminal (ie, the RL terminal) of the (C + L) WDM unit 107. When the (C + L) WDM unit 101 receives the first multiplexed optical signal, the first multiplexed optical signal is demultiplexed into a C-band optical signal and an L-band optical signal after passing through the (C + L) WDM unit 101. The L-band optical signal is output from the TL terminal of the (C + L) WDM unit 101 to the IN terminal of the first FIU-L unit 103, and the L-band optical signal is sequentially output to the OA-L unit 105 through the first FIU-L unit 103. Then, the OA-L unit 105 amplifies the L-band optical signal and outputs the amplified L-band optical signal to the RL end of the (C + L) WDM unit 107 and enters the (C + L) WDM unit 107. In addition, the OSC-L unit 106 is used to monitor the L-band optical signals to ensure the normal operation of the optical terminal multiplexer.

When the C-band optical signal and the L-band optical signal obtained by demultiplexing the first multiplexed optical signal arrive at the (C + L) WDM unit 107, the (C + L) WDM unit 107 pairs the C-band optical signal and the L-band optical signal. The signal performs a multiplexing operation to obtain a second multiplexed optical signal, and sends the second multiplexed optical signal from the output terminal of the (C + L) WDM unit 107.

Compared with other existing optical terminal multiplexers, the optical terminal multiplexer in the embodiment of the present application does not use the C-band optical fiber interface unit FIU-C during the multiplexing and demultiplexing operation of the C-band signal. Since the optical terminal multiplexer in the embodiment of the present application does not use FIU-C, the OA-C unit 102 used in the embodiment of the present application is independently designed. The OA-C unit 102 has a filtering function for Filter out the L-band signals that have crosstalk in the C-band optical signals, and only detect the C-band optical signals with the input power detection of the OA-C unit 102, thereby avoiding errors in the working process of the OA-C unit 102, and improving OA-C. The performance of the unit 102. In particular, when there is no C-band optical signal, the OA-C unit 102 will not detect the multi-wave crosstalk optical power corresponding to the L-band signal.

The OA-C unit 102 with a filtering function in the embodiment of the present application may include but is not limited to the following ways to achieve its independent design: 1. Adding an L-band filter to a conventional OA-C unit, the filter is used to filter C-band light L-band optical signal of crosstalk in the signal; the specific setting method may include but is not limited to: 1) integrating the L-band filter with the PIN-type diode in the OA-C unit so that the PIN-type diode detects the The optical power value is the optical power of the C-band optical signal, so that the optical discharge control of the EDFA in the OA-C unit is normal. 2) The L-band filter is independently set between the PIN-type diode and the beam splitter, which can be specifically located between the PIN-type diode input and one of the output ends of the beam splitter, so that the L-band filter will separate the OA-C After the input optical signal of the unit is filtered, the PIN diode detects the filtered input optical signal to ensure that the PIN diode can only detect the optical power of the C-band optical signal.

As shown in FIG. 2 (a), it is a schematic diagram of an embodiment of the corresponding optical amplifying unit in the above 1). The L-band filter is integrated with the PIN-type diode in the OA-C unit. As shown in FIG. 2 (b), a schematic diagram of an embodiment of the corresponding optical amplifying unit in 2) is shown, in which an L-band filter is disposed between a PIN diode and a beam splitter.

In addition to the independent design of the OA-C unit 102 described above, in order to ensure that the optical amplifier control of the EDFA in the OA-C unit 102 is normal, the optical terminal multiplexer may further include: an optical power calculation unit, wherein the optical power calculation The unit is respectively connected to the C-band optical amplifier unit and the L-band optical amplifier unit. The optical power calculation unit is used to calculate the optical power value of the L-band optical signal of the crosstalk in the C-band optical signal and input the calculation result into the C-band optical amplifier unit. The calculation result is used for the C-band optical amplifying unit to filter the L-band optical signal of crosstalk in the C-band optical signal.

FIG. 3 is a schematic diagram of an embodiment of an optical power calculation unit corresponding to an optical terminal multiplexer in an embodiment of the present application.

As shown in FIG. 3, the optical power calculation unit includes a calculation module 301, an L-band spectrum detection module 302, an OA-L gain spectrum module 303, a storage module 304, and a communication module 305.

The L-band spectrum detection module 302 is connected to the OA-L unit, the communication module 305 is connected to the OA-L unit, OA-C unit, and OA-L gain spectrum module 303, and the calculation module 301 is respectively connected to the L-band spectrum detection module 302, The OA-L gain spectrum module 303, the storage module 304, and the communication module 305 are connected.

At the same time, a communication module 306 and a calculation module 307 are added to the OA-C unit module, where the communication module 306 is used to receive the crosstalk L-band optical signals in the C-band optical signals calculated by the calculation module 301 and sent by the communication module 305. The optical power value calculation module 307 is configured to calculate the control power of the EDFA according to the optical power value of the L-band optical signal of crosstalk in the C-band optical signal.

In order to facilitate the description of the working principle of the optical power calculation unit in FIG. 3, the following definitions are made first as follows:

The L-band spectrum at the IN end of the OA-C unit is: P _C-in-L , and the spectrum at the IN end of the demultiplexing unit (C + L) WDM is: P _{C + L.} The spectrum at the IN end of the OA-L unit is: P _{OA-L_in} , the output spectrum of the OUT end of the OA-L unit is: P _{OA-L_out} .

The L-band spectrum detection module 302 can obtain the OA-L unit output spectrum (P _{OA-L_out} ), and the OA-L gain spectrum module 303 can obtain the standard gain (STDGAIN) and pre-tilt (S) corresponding to the OA-L unit. Thereby, the OA-L gain spectrum is obtained, which is written as: (OA-L-GAIN). The storage unit is used to store the insertion loss spectrum from the IN end of the demultiplexing unit (C + L) WDM to the first FIU-L unit, and is written as: (ATT_L), and, the demultiplexing unit (C + L) The insertion loss spectrum from WDM's IN terminal to TC terminal is recorded as: ISOL_L.

The calculation module 301 performs calculation according to the following relationship:

Relation formula 1, P _C-in-L = P _{C + L} -ISOL_L; Relation formula 2: P _{C + L} -ATT_L = P _{OA-L_in} ;

Relationship three: P _{OA-L_in} + OA-L-GAIN = P _{OA-L_out} .

According to the above three relations, a relation four can be obtained: P _C-in-L = P _{OA-L_out} -OA-L-GAIN + ATT_L-ISOL_L; Integrating the optical power of P _C-in-L can obtain OA- Optical power corresponding to the L-band spectrum at the IN end of the C unit.

After the calculation module 301 calculates P _C-in-L , the communication module 305 sends the value of P _C-in-L to the communication module 306, and the calculation module 307 calculates the control power of the EDFA according to the relationship 5, and records it as P1 _{C -EDFA} .

The fifth relationship is: P1 _C-EDFA = P2 _C-EDFA -P _C-in-L ; where P2 _C-EDFA is the optical power value detected by the PIN tube.

The insertion loss spectrum (ATT_L) from the IN terminal of the multiplexing unit (C + L) WDM to the first FIU-L unit is shown in Table 1 below. The IN terminal of the WDM of the demultiplexing unit (C + L) is to The insertion loss spectrum ISOL_L at the TC end is shown in Table 2 below.

Table 1

Wave number	1	2	...	96
Insertion loss (dB)	0.8	0.75	...	0.8

Table 2

Wave number	1	2	...	96
Isolation (dB)	20.5	twenty three	...	35

The OA-L gain spectrum (OA-L-GAIN) can be calculated according to the standard gain (STDGAIN) and the pretilt (S). For example, the standard gain STDGAIN = 20Db; the pretilt S = 0.8dB; then the first wave gain GAIN = STDGAIN + 0.5 * S, the 96th wave GAIN = stdgain-0.5 * S; the gain difference of the intermediate wavelength can be shown in Table 3 below:

table 3

Wave number	1	2	...	96
GAIN (dB)	20.4	20.39	...	19.6

The output spectrum (P _{OA-L_out} ) of the OA-L unit is shown in Table 4 below:

Table 4

Wave number	1	2	...	96
P (dBm)	1.4	-60	...	0.6

Finally, according to the data in Tables 1 to 4 above, and using the above-mentioned relational expression 4, the L-band spectrum at the IN end of the OA-C unit can be calculated as (P _C-in-L ).

The optical terminal multiplexer described in FIG. 1 is suitable for a scenario without a Raman amplifier (RAMAN). The optical terminal multiplexer suitable for a Raman scenario is described in detail below.

Because in the scene with Raman amplifier, FIU-C is required to filter out the EDFA noise in the OA-C unit in the C band. Therefore, compared with the optical terminal multiplexer described in FIG. 1 above, the optical terminal multiplexer in the scenario with a Raman amplifier also includes: (C + L) -band Raman amplifier and C-band optical fiber interface A unit in which a (C + L) -band Raman amplifier is provided at an input end of the (C + L) -band optical signal demultiplexing unit and configured to receive a first multiplexed optical signal and perform the first multiplexed optical signal In the amplified (C + L) band optical signal demultiplexing unit, the C-band optical fiber interface unit is disposed between the output end of the C-band optical amplification unit and the input end of the (C + L) -band optical signal multiplexing unit.

Specifically, FIG. 4 is a schematic diagram of an embodiment of an optical terminal multiplexer in a scene with a Raman amplifier in an embodiment of the present application.

As shown in FIG. 4, the optical terminal multiplexer includes: (C + L) WDM unit 401, OA-C unit 402, first FIU-L unit 403, second FIU-L unit 404, OA-L unit 405, OSC-L unit 406, (C + L) WDM unit 407, (C + L) Raman amplifier 408, and FIU-C unit 409, where (C + L) WDM unit 401 is an optical signal demultiplexing unit, The (C + L) WDM unit 401 is used to perform a demultiplexing operation, the (C + L) WDM unit 407 is an optical signal multiplexing unit, and the (C + L) WDM unit 407 is used to perform a multiplexing operation.

(C + L) Raman amplifier 408 is set at the input of (C + L) WDM unit 401, FIU-C unit 409 is set at the output of OA-C unit 402 and the input of (C + L) WDM unit 407 between.

Optionally, in an embodiment, the optical terminal multiplexer further includes: an OSC-C unit 410, wherein the OSC-C unit 410 is provided at the RMC input end of the FIU-C unit 409 and is used for the C-band Light signals are monitored.

Other descriptions of the optical terminal multiplexer corresponding to FIG. 4 are similar to the above-mentioned corresponding optical terminal multiplexer in FIG. 1, and will not be repeated here.

In the embodiment of the present application, in a non-Raman scenario, the two fiber interface units at the input end and the output end of the C-band optical amplifier unit in the optical terminal multiplexer are removed, and the C-band light with a filtering function is independently designed. The amplifier unit compensates for the lack of the function of removing the optical fiber interface unit, so that the optical terminal multiplexer eliminates the insertion loss of the two optical fiber interface units at the input end and the output end of the C-band optical amplifier unit, thereby improving system performance.

In addition, in a Raman scenario, removing the optical interface unit corresponding to the input end of the C-band optical amplifier unit in the optical terminal multiplexer can also reduce the insertion loss of the optical interface unit in the optical terminal multiplexer and improve system performance.

An embodiment of the present application further provides a wavelength division multiplexing system. The wavelength division multiplexing system includes at least two optical terminal multiplexers described in FIG. 1 to FIG. 6. Connected in series to achieve high-performance optical signal transmission.

FIG. 5 is a schematic diagram of an embodiment of a wavelength division multiplexing system in a non-Raman scenario according to an embodiment of the present application.

As shown in FIG. 5, in a non-Raman scenario, a wavelength division multiplexing system is formed by connecting at least two optical terminal multiplexers. The structure of the optical terminal multiplexer is the same as that shown in FIG. 1. There is no FIU-C unit between the transmitting end of the optical terminal multiplexing, that is, the output of the OA-C unit and the (C + L) WDM unit of the multiplexing function, and the receiving end of the optical terminal multiplexing, that is, demultiplexing There is also no FIU-C unit between the (C + L) WDM unit and the input of the OA-C unit. Compared with the existing WDM system, the FIU-C corresponding to the sender and receiver can be reduced. Unit insertion loss to improve system performance.

Among them, it should be noted that the manner for filtering the L-band signal of crosstalk in the C-band optical signal in the optical terminal multiplexer described in FIG. 5 includes, but is not limited to, the filtering shown in FIG. 2 and FIG. 3 described above. the way.

In addition, when the filtering method described in FIG. 3 is used, an L-band spectrum detection module may be provided in each optical terminal multiplexer in the wavelength division multiplexing system; or only in the wavelength division multiplexing. The first optical terminal multiplexer and the last optical terminal multiplexer in the system are provided with an L-band spectrum detection module. The other optical terminal multiplexers in the middle of the wavelength division multiplexing system are not provided with an L-band spectrum detection module. . The output spectrum of the OA-L unit OUT of the optical terminal multiplexer in the middle part of the wavelength division multiplexing system can detect the corresponding OA-L unit OUT according to the L-band spectrum detection module in the first optical terminal multiplexer. The output spectrum of the terminal and the L-band spectrum detection module in the last optical terminal multiplexer are calculated by detecting the output spectrum of the corresponding OA-L unit OUT terminal. The specific calculation method is not limited in this application.

It should also be noted that the L-band spectrum detection module described in the embodiments of the present application may specifically include, but is not limited to, an OPM spectrum detection module, and there is no limitation on this application.

FIG. 6 is a schematic diagram of another embodiment of a wavelength division multiplexing system in a Raman scenario according to an embodiment of the present application.

As shown in FIG. 6, in a Raman scenario, a wavelength division multiplexing system is formed by connecting at least two optical terminal multiplexers. The structure of the optical terminal multiplexer is the same as that shown in FIG. 4. There is a FIU-C unit between the transmitting end of the optical terminal multiplexing, that is, the output of the OA-C unit and the (C + L) WDM unit of the multiplexing function, and the receiving end of the optical terminal multiplexing, that is, the demultiplexing function There is no FIU-C unit between the (C + L) WDM unit and the input of the OA-C unit. Compared with the existing WDM system, the insertion loss of the FIU-C unit corresponding to the receiving end can be reduced. Improve system performance.

Among them, it should be noted that the matching filter in the optical terminal multiplexer described in FIG. 6 for filtering the L-band signal of crosstalk in the C-band optical signal includes, but is not limited to, the filtering shown in FIG. 2 and FIG. 3 described above. the way.

Consistent with the wavelength division multiplexing system shown in FIG. 5, when the filtering method described in FIG. 3 is used, an L-band spectrum can be set in each optical terminal multiplexer in the wavelength division multiplexing system. Detection module; L-band spectrum detection module can also be set only in the first optical terminal multiplexer and the last optical terminal multiplexer in the WDM system, and other optical terminals located in the middle part of the WDM system There is no L-band spectrum detection module in the multiplexer. The output spectrum of the OA-L unit OUT of the optical terminal multiplexer in the middle part of the wavelength division multiplexing system can detect the corresponding OA-L unit OUT according to the L-band spectrum detection module in the first optical terminal multiplexer. The output spectrum of the terminal and the L-band spectrum detection module in the last optical terminal multiplexer are calculated by detecting the output spectrum of the corresponding OA-L unit OUT terminal. The specific calculation method is not limited in this application.

An embodiment of the present application further provides a control method, as shown in FIG. 7, including:

701. The (C + L) band optical signal demultiplexing unit receives the first multiplexed optical signal in the C band and the L band, and the (C + L) band optical signal demultiplexing unit is used for the first multiplexed optical signal. Perform demultiplexing operation to obtain C-band optical signal and L-band optical signal;

702. Control the C-band optical amplifier unit to directly amplify the C-band optical signal output by the (C + L) -band optical signal demultiplexing unit, and directly output the amplified C-band optical signal to (C + L) -band light. A signal multiplexing unit, wherein the C-band optical amplifying unit has a function of filtering the L-band optical signal of crosstalk in the C-band optical signal;

703: Control the L-band optical monitoring unit to monitor the L-band signal output through the first L-band optical fiber interface unit;

704. Control the C-band optical amplifier unit to amplify the L-band signal output through the first L-band fiber interface unit, and output the amplified L-band signal to the (C + L) band light through the second L-band fiber interface unit. Signal multiplexing unit;

705. The control (C + L) band optical signal multiplexing unit performs a multiplexing operation on the amplified C-band optical signal and the L-band optical signal to obtain a second multiplexed signal and sends the second multiplexed signal.

In an embodiment, the C-band optical amplifying unit includes an L-band filter, wherein the L-band filter is used to filter the L-band optical signal of crosstalk in the C-band optical signal.

In an embodiment, the control method further includes: controlling the optical power calculation unit to calculate the optical power value of the L-band optical signal of the crosstalk in the C-band optical signal and inputting the calculation result into the C-band optical amplification unit, and the calculation result is used for The C-band optical amplifying unit filters the L-band optical signals of crosstalk in the C-band optical signals.

In an embodiment, the control method further includes:

Controlling the (C + L) -band Raman amplifier to receive the first multiplexed optical signal and amplify the first multiplexed optical signal and input it into the (C + L) -band optical signal demultiplexing unit;

Control the C-band optical amplifier unit to directly amplify the C-band optical signal output by the (C + L) -band optical signal demultiplexing unit, and output the amplified C-band optical signal to the (C + L) via the C-band optical amplifier unit ) Band optical signal multiplexing unit.

In an embodiment, the C-band optical amplifier unit further includes a PIN-type diode, and the L-band filter is integrated in the PIN-type diode.

In an embodiment, the C-band optical amplifier unit further includes a PIN-type diode and a beam splitter, and the L-band filter is disposed between the PIN-type diode and the beam splitter.

In an embodiment, the optical power calculation unit includes an L-band spectrum detection module, and the L-band spectrum detection module is configured to detect an output spectrum of the L-band optical amplification unit.

It should be noted that the above-mentioned functions of the optical terminal multiplexer in FIG. 1 to FIG. 4 may be controlled by referring to the control method described in the embodiment of the present application. Other related descriptions of the control method corresponding to FIG. 8 may be provided. Refer to the related description of the optical terminal controller in FIG. 1 to FIG. 4, which will not be repeated here.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product.

The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions according to the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server, or data center Transmission by wire (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) to another website site, computer, server, or data center. The computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server, a data center, and the like that includes one or more available medium integration. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (Solid State Disk (SSD)), and the like.

A person of ordinary skill in the art may understand that all or part of the steps in the various methods of the foregoing embodiments may be implemented by a program instructing related hardware. The program may be stored in a computer-readable storage medium. The storage medium may include: ROM, RAM, disk or optical disc, etc.

The policy control method, network element, and system provided by the embodiments of the present application have been described in detail above. Specific examples have been used in this document to explain the principles and implementation of the present application. The descriptions of the above embodiments are only for understanding. The method of the present application and its core idea; meanwhile, for a person of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not Understood as a limitation on this application.

Claims (15)

1. An optical terminal multiplexer, comprising:

   (C + L) -band optical signal demultiplexing unit, (C + L) -band optical signal multiplexing unit, C-band optical amplification unit, first L-band optical fiber interface unit, second L-band optical fiber interface unit, L-band optical Amplifying unit and L-band optical monitoring unit;

   An output end of the (C + L) -band optical signal demultiplexing unit is connected to an input end of the C-band optical amplification unit, and an output end of the C-band optical amplification unit is connected to the (C + L) ) One input end of the optical signal multiplexing unit is connected; the other output end of the (C + L) band optical signal demultiplexing unit is connected to the input end of the first L-band optical fiber interface unit, and the first The output ends of an L-band optical fiber interface unit are respectively connected to the input ends of the L-band optical amplification unit and the L-band optical monitoring unit, and the outputs of the L-band optical amplification unit and the L-band optical monitoring unit Terminals are respectively connected to the input ends of the second L-band optical fiber interface unit, and the output ends of the second L-band optical fiber interface unit are connected to the other input ends of the (C + L) -band optical signal multiplexing unit;

   The (C + L) band optical signal demultiplexing unit is configured to receive a first multiplexed optical signal corresponding to the C band and the L band and perform a demultiplexing operation on the first multiplexed signal to obtain a C band optical signal. And L-band optical signals;

   The L-band optical monitoring unit monitors the L-band signal output through the first L-band optical fiber interface unit;

   The C-band optical amplification unit and the L-band optical amplification unit are respectively configured to perform a demultiplexing operation on the first multiplexed signal by the (C + L) band optical signal demultiplexing unit to obtain C Amplify the optical signal in the L-band and the optical signal in the L-band, wherein the C-band optical amplifying unit has a function of filtering the L-band optical signal of crosstalk in the C-band optical signal;

   The (C + L) -band optical signal multiplexing unit is configured to perform a multiplexing operation on the amplified C-band optical signal and the L-band optical signal to obtain a second multiplexed optical signal and send the second multiplexed optical signal. .
2. The optical terminal multiplexer according to claim 1, wherein the C-band optical amplifying unit includes an L-band filter, wherein the L-band filter is used to filter the L-band of crosstalk in the C-band optical signal Light signal.
3. The optical terminal multiplexer according to claim 1, wherein the optical terminal multiplexer further comprises: an optical power calculation unit, wherein the optical power calculation unit and the C-band optical amplifier unit are respectively And is connected to the L-band optical amplification unit, and the optical power calculation unit is configured to calculate the optical power value of the L-band optical signal of crosstalk in the C-band optical signal and input the calculation result into the C-band optical amplification unit, where The calculation result is used by the C-band optical amplifying unit to filter the L-band optical signal of crosstalk in the C-band optical signal.
4. The optical terminal multiplexer according to any one of claims 1 to 3, wherein the optical terminal multiplexer further comprises: a (C + L) -band Raman amplifier and a C-band optical fiber interface unit, Wherein, the (C + L) -band Raman amplifier is disposed at an input end of the (C + L) -band optical signal demultiplexing unit and is configured to receive the first multiplexed optical signal and to apply the first complex signal. The optical signal is amplified and input into the (C + L) -band optical signal demultiplexing unit, and the C-band optical fiber interface unit is provided at the output end of the C-band optical amplification unit and the (C + L) Between the input ends of the optical signal multiplexing unit of the band.
5. The optical terminal multiplexer according to claim 2, wherein the C-band optical amplifier unit further comprises a PIN-type diode, and the L-band filter is integrated in the PIN-type diode.
6. The optical terminal multiplexer according to claim 2, wherein the C-band optical amplifier unit further comprises a PIN-type diode and a beam splitter, and the L-band filter is provided between the PIN-type diode and the Beamsplitter.
7. The optical terminal multiplexer according to claim 3, wherein the optical power calculation unit includes an L-band spectrum detection module, and the L-band spectrum detection module is configured to detect an output of the L-band optical amplification unit spectrum.
8. A control method, comprising:

   Controlling the (C + L) -band optical signal demultiplexing unit to receive the first multiplexed optical signal in the C-band and the L-band, and the (C + L) -band optical signal demultiplexing unit is configured to multiplex the first multiplexed optical signal Demultiplex the optical signals to obtain C-band optical signals and L-band optical signals;

   Control the C-band optical amplifier unit to directly amplify the C-band optical signal output by the (C + L) -band optical signal demultiplexing unit, and directly output the amplified C-band optical signal to (C + L) -band light A signal multiplexing unit, wherein the C-band optical amplifying unit has a function of filtering an L-band optical signal of crosstalk in the C-band optical signal;

   Controlling the L-band optical monitoring unit to monitor the L-band signal output through the first L-band fiber interface unit;

   Control the C-band optical amplifier unit to amplify the L-band signal output through the first L-band fiber interface unit, and output the amplified L-band signal to the (C + L) band light through the second L-band fiber interface unit A signal multiplexing unit, the (C + L) band optical signal multiplexing unit is configured to perform a multiplexing operation on the amplified C-band optical signal and the L-band optical signal to obtain a second multiplexed signal and send the second complex signal With signal.
9. The control method according to claim 8, wherein the C-band optical amplifying unit comprises an L-band filter, wherein the L-band filter is used to filter the L-band optical signal of crosstalk in the C-band optical signal.
10. The control method according to claim 8, further comprising:

    Control the optical power calculation unit to calculate the optical power value of the L-band optical signal of crosstalk in the C-band optical signal and input the calculation result into the C-band optical amplification unit, where the calculation result is used by the C-band optical amplification unit to filter C L-band optical signal with crosstalk in the band optical signal.
11. The control method according to any one of claims 8 to 10, wherein the control method further comprises:

    Controlling a (C + L) -band Raman amplifier to receive the first multiplexed optical signal and amplify the first multiplexed optical signal and input the (C + L) -band optical signal demultiplexing unit;

    Controlling the C-band optical amplifier unit to directly amplify the C-band optical signal output by the (C + L) -band optical signal demultiplexing unit, and output the amplified C-band optical signal to the C-band optical amplifier unit to The (C + L) band optical signal multiplexing unit.
12. The control method according to claim 9, wherein the C-band optical amplifier unit further comprises a PIN-type diode, and the L-band filter is integrated in the PIN-type diode.
13. The control method according to claim 9, wherein the C-band optical amplifier unit further comprises a PIN-type diode and a beam splitter, and the L-band filter is provided between the PIN-type diode and the beam splitter. between.
14. The control method according to claim 10, wherein the optical power calculation unit includes an L-band spectrum detection module, and the L-band spectrum detection module is configured to detect an output spectrum of the L-band optical amplification unit.
15. A wavelength division multiplexing system, characterized in that the wavelength division multiplexing system includes at least two optical terminal multiplexers according to any one of claims 1 to 7.

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