WO2019033331A1

WO2019033331A1 - All-optical regenerator self-adapting apparatus

Info

Publication number: WO2019033331A1
Application number: PCT/CN2017/097811
Authority: WO
Inventors: 卢行; 武保剑; 耿勇; 文峰; 邱昆
Original assignee: 电子科技大学
Priority date: 2017-08-14
Filing date: 2017-08-17
Publication date: 2019-02-21
Also published as: CN107579777A; CN107579777B

Abstract

Disclosed is an all-optical regenerator self-adapting apparatus, consisting of a bandwidth adjustable filter unit (1), an automatic gain control (AGC) light amplification unit (2), a signal processing/control unit (3) and a light shaping unit (4). Under the control of the signal processing/control unit (3), measurement of the optical power of an input degraded signal is automatically completed by means of the bandwidth adjustable filter unit (1), and the operating bandwidth of a bandwidth adjustable filter (101) is fixed in an optimized position. The signal processing/control unit (3) determines, by means of an externally input clock pumping power detected by a photoelectric detector (303) inside the signal processing/control unit, an optimal operating point of a light shaper, and thus controls, according to the characteristics of an input degraded signal, an amplification factor of an AGC gain light amplifier, so that an all-optical regenerator always operates in an optimal state matching an input signal.

Description

All-optical regenerator adaptive device

Technical field

The invention belongs to the field of signal processing, and more particularly to an all-optical regenerator adaptive device.

Background technique

Optical fiber communication is developing in the direction of long distance, high speed and large capacity. In the process of optical fiber communication transmission, the cascading of optical devices such as EDFA (erbium-doped fiber amplifier) will introduce amplified self-emission noise. ASE, which degrades the signal. In order to extend the transmission distance, all-optical regeneration technology is required to improve signal quality.

Among many all-optical regeneration schemes, the regeneration scheme based on the nonlinear effect of the four-wave mixing FWM fiber is the most flexible, and can be implemented by various pumping methods such as degraded data signal, continuous light or clock signal. The operating state of the all-optical regenerator depends primarily on the threshold of the optical nonlinear effect or the optimum operating point of the nonlinear element. It can be seen that the matching of the input degraded signal characteristics with the optimal operating point is crucial.

The current practice is to continuously adjust the gain of the optical amplifier according to the degree of degradation of the ASE noise in the input signal, so that the level of the input signal matches the optimal operating point of the nonlinear unit. Sometimes it is necessary to adjust the power of the pump light to change the optimal working point position to obtain different regeneration performance. In practical applications, since the degraded signal is often uncertain, the all-optical regenerator is difficult to dynamically match the input degraded signal, and needs to be designed for a specific application scenario. Therefore, it cannot be adapted to the optical fiber communication network. Plug and play requirements for devices.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide an all-optical regenerator adaptive device capable of automatically adjusting to an optimal working state according to the degradation characteristic of ASE noise in an input signal, and having plug-and-play in an optical network. The advantages.

To achieve the above object, an all-optical regenerator adaptive device includes: a bandwidth-tunable filtering unit, an automatic gain control (AGC) optical amplifying unit, a signal processing/control unit, and a light shaping unit;

The bandwidth tunable filtering unit includes a bandwidth tunable filter OTF, a driving circuit 1 and a beam splitter 1;

The AGC optical amplifying unit comprises an AGC optical amplifier and a peripheral driving circuit 2;

The signal processing/control unit comprises a digital signal processing module, a photodetector, a bandwidth control signal generating module, an AGC control signal generating module, and an A/D converter and a D/A converter;

The light shaping unit comprises a beam splitter 2, a high nonlinear fiber, a multiplexer and a demultiplexer;

After the degraded optical signal is input to the bandwidth adjustable filtering unit, the OTF is filtered first, and then the optical signal is separated by the optical splitter 1 and input to the photodetector 1. The photodetector 1 measures the power of the degraded optical signal in real time, and utilizes A. The /D converter 1 performs analog-to-digital conversion on the degraded optical signal, and then inputs the digital signal processing module to the digital signal processing module; the digital signal processing module continuously generates a digital signal for controlling the bandwidth control signal generating module according to the current degraded optical signal power, by loading the digital The signal causes the bandwidth control signal generating module to generate a bandwidth control signal, which is then converted into an analog signal by the D/A converter 1, and loaded into the driving circuit 1, and the driving signal outputted by the driving circuit 1 is used to change the bandwidth of the OTF, and finally the photoelectric The detector 1 measures a dependence curve between the output power of the degraded optical signal and the bandwidth, and calculates the power of the degraded optical signal.

And the optimal bandwidth, and then fix the working bandwidth of the OTF at the optimized bandwidth;

The pump signal is input to the photodetector 2 and the multiplexer through the optical splitter 2, and the photodetector 2 measures the pump signal power in real time, and performs analog-to-digital conversion on the pump signal by the A/D converter 2, and then inputs To the digital signal processing module; the digital signal processing module reads the optimal operating point of the pump signal stored in the digital signal processing module according to the current pump signal power, and generates the control signal generated according to the measured optical signal power The digital signal of the module, by loading the digital signal, causes the AGC control signal generating module to generate an AGC control signal, which is then converted into an analog signal by the D/A converter 2, and loaded into the driving circuit 2, and the driving signal outputted through the driving circuit 2 To change the gain of the optical amplifier to degrade the optical signal

Matching with the optimal working point to output the matched degraded optical signal; degrading the optical signal and the pumping signal to be coupled into one optical signal through the multiplexer, performing all-optical regeneration in the highly nonlinear optical fiber, and then demultiplexing The demultiplexed optical signal is obtained after demultiplexing.

The object of the invention is achieved in this way:

The invention relates to an all-optical regenerator adaptive device, which is composed of a bandwidth adjustable filtering unit, an automatic gain control (AGC) optical amplifying unit, a signal processing/control unit and a light shaping unit; under the control of a signal processing/control unit, The bandwidth adjustable filtering unit automatically completes the measurement of the optical power of the input degraded signal, And fixing the working bandwidth of the bandwidth tunable filter to an optimized position; the signal processing/control unit determines the optimal operating point of the optical shaper by measuring the clock power of the external input through its internal photodetector, and then degraded according to the input The characteristics of the signal control the amplification of the AGC gain optical amplifier so that the all-optical regenerator always works in an optimum state that matches the input signal.

DRAWINGS

1 is a schematic diagram of an all-optical regenerator adaptive device of the present invention;

Figure 2 is a Q factor gain curve;

Figure 3 is a dependence curve of the operating point of the all-optical regenerator adaptive device on the pump signal;

4 is a graph showing the relationship between the output power of the degraded signal and the bandwidth.

Detailed ways

The specific embodiments of the present invention are described below in conjunction with the drawings in order to provide a better understanding of the invention. It is to be noted that in the following description, when a detailed description of known functions and designs may dilute the main content of the present invention, these descriptions will be omitted herein.

Example

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of an all-optical regenerator adaptive device of the present invention.

In this embodiment, as shown in FIG. 1, an all-optical regenerator adaptive device includes: a bandwidth-tunable filtering unit 1, an automatic gain control (AGC) optical amplifying unit 2, and a signal processing/control unit 3. And light shaping unit 4;

The bandwidth tunable filtering unit 1 includes a bandwidth tunable filter OTF 101, a driving circuit 102, and a beam splitter 103;

The AGC optical amplifying unit 2 includes an AGC optical amplifier 201 and a peripheral driving circuit 202;

The signal processing/control unit 3 includes a digital signal processing module 301, a photodetector 302/303, a bandwidth control signal generating module 304, an AGC control signal generating module 305, and an A/D converter 306/307 and a D/A converter 308. /309;

The optical shaping unit 4 includes a beam splitter 401, a highly nonlinear optical fiber 402, a multiplexer 403, and a demultiplexer 404;

In this embodiment, a 1/99 optical splitter is selected, and then the parameters of the all-optical regenerator adaptive device are set: the signal rate of the all-optical regenerator adaptive device is set to 10 Gb/s, the input degraded signal and the pump Pudu is expressed in dBm units. The length of the highly nonlinear fiber in the optical shaping unit is 500m, the dispersion slope at the zero-dispersion wavelength point at 1550nm is 0.016ps/nm ² /km, and the nonlinear coefficient is 12.1W ^-1 /km. Automatically adjust to the optimal operating state according to the degradation characteristics of the ASE noise in the input signal.

The workflow of the all-optical regenerator adaptive device is described in detail below for the above parameters, specifically:

After the degraded optical signal is input to the bandwidth tunable filtering unit 1, it is filtered by the OTF 101, and then an optical signal is separated by the optical splitter 103 and input to the photodetector 302. The photodetector 302 measures the degraded optical signal power in real time, and The A/D converter 306 is used to perform analog-to-digital conversion on the degraded optical signal, and then input to the digital signal processing module 301;

The digital signal processing module 301 continuously generates a digital signal for controlling the bandwidth control signal generating module 304 according to the current degraded optical signal power. By loading the digital signal, the bandwidth control signal generating module 304 generates a bandwidth control signal, and then performs D/A conversion. The converter 308 converts the analog signal into an analog signal and loads it into the driving circuit 102. The driving signal outputted by the driving circuit 102 changes the bandwidth of the OTF 101, and finally causes the photodetector 302 to measure the dependence between the output power and the bandwidth of the degraded optical signal. Curve and calculate the power of the degraded optical signal

And the optimal bandwidth, and then fix the working bandwidth of the OTF 101 at the optimized bandwidth;

In this embodiment, the input degraded optical signal is split by the photodetector connected by the digital signal processing module 301 after being split by the optical splitter 103 of 1/99, and the dependence curve between the output optical power and the bandwidth of the degraded optical signal is obtained. As shown in FIG. 4, according to the data processing by the digital signal processing module 301, the optical signal power is calculated to be 6.08 dBm, thereby determining that the optimized bandwidth of the OTF is 30 GHz (the order of this part is continuously detecting power, and then changing the bandwidth, Finally, the measured power-dependent bandwidth dependence curve is obtained;

When the input pump is given, the optical power of the degraded optical signal is simultaneously changed and the ASE noise power is adjusted so that the degree of deterioration of the input degraded optical signal is constant, that is, the Q value does not change, and the Q-value gain of the reproduced signal is dependent on the signal optical power. The curve ΔQ(PS), as shown in Figure 2, determines the optimum operating point for a given input pump.

Change the input pump power and repeat the above operation to obtain the dependence curve of the regenerative operating point on the input pump power.

As shown in Figure 3. From the above analysis, the optimal operating point depends on the externally input clock pump power, and the correspondence between them is stored in the signal processing/control unit.

The pump signal is input to the photodetector 303 and the multiplexer 403 through the beam splitter 401, and the photodetector 303 measures the pump signal power in real time, and performs analog-to-digital conversion on the pump signal by using the A/D converter 307. Input to the digital signal processing module 301;

In this embodiment, after the pumping light signal enters the light shaping unit 4, it passes through the 1/99 splitter 401 and enters the signal processing/control unit 3, and the internal digital signal processing module 301 is connected to the photodetector 303. The clock input power of the external input is 16.9dBm, and then the optimal operating point of the read optical shaper is 7.72dBm.

The digital signal processing module 301 reads the optimal operating point of the pump signal stored in the digital signal processing module 301 based on the current pump signal power, and generates a number for controlling the AGC control signal generating module 305 based on the measured optical signal power. The signal, by loading the digital signal, causes the AGC control signal generating module 305 to generate an AGC control signal, which is then converted into an analog signal by the D/A converter 309, and loaded into the driving circuit 202, and is changed by the driving signal outputted by the driving circuit 202. The gain of the AGC optical amplifier 201, at which the gain is 1.63 dB, thereby degrading the optical signal

Matching with the optimal operating point to output the matched degraded optical signal; the degraded optical signal and the pumping signal are coupled to one optical signal through the multiplexer 403, and the all-optical regeneration is performed in the highly nonlinear optical fiber 402, and then the solution is solved. The multiplexer 404 demultiplexes to obtain a reproduced optical signal.

While the invention has been described with respect to the preferred embodiments of the present invention, it is understood that the invention These variations are obvious as long as the various changes are within the spirit and scope of the invention as defined and claimed in the appended claims.

Claims

An all-optical regenerator adaptive device, comprising: a bandwidth adjustable filtering unit, an automatic gain control (AGC) optical amplifying unit, a signal processing/control unit, and a light shaping unit;

The bandwidth tunable filtering unit includes a bandwidth tunable filter OTF, a driving circuit 1 and a beam splitter 1;

The AGC optical amplifying unit comprises an AGC optical amplifier and a peripheral driving circuit 2;

The signal processing/control unit comprises a digital signal processing module, a photodetector, a bandwidth control signal generating module, an AGC control signal generating module, and an A/D converter and a D/A converter;

The light shaping unit comprises a beam splitter 2, a high nonlinear fiber, a multiplexer and a demultiplexer;

After the degraded optical signal is input to the bandwidth adjustable filtering unit, the OTF is filtered first, and then the optical signal is separated by the optical splitter 1 and input to the photodetector 1. The photodetector 1 measures the power of the degraded optical signal in real time, and utilizes A. The /D converter 1 performs analog-to-digital conversion on the degraded optical signal, and then inputs the digital signal processing module to the digital signal processing module; the digital signal processing module continuously generates a digital signal for controlling the bandwidth control signal generating module according to the current degraded optical signal power, by loading the digital The signal causes the bandwidth control signal generating module to generate a bandwidth control signal, and then converts it into a pseudo signal through the D/A converter 1, and loads it into the driving circuit 1, and changes the bandwidth of the OTF through the driving signal outputted by the driving circuit 1, and finally makes the photoelectric The detector 1 measures a dependence curve between the output power of the degraded optical signal and the bandwidth, and calculates the power of the degraded optical signal.
And the optimal bandwidth, and then fix the working bandwidth of the OTF at the optimized bandwidth;

The pump signal is input to the photodetector 2 and the multiplexer through the optical splitter 2, and the photodetector 2 measures the pump signal power in real time, and performs analog-to-digital conversion on the pump signal by the A/D converter 2, and then inputs To the digital signal processing module; the digital signal processing module reads the optimal operating point of the pump signal stored in the digital signal processing module according to the current pump signal power, and generates the control signal generated according to the measured optical signal power The digital signal of the module, by loading the digital signal, causes the AGC control signal generating module to generate an AGC control signal, which is then converted into an analog signal by the D/A converter 2, and loaded into the driving circuit 2, and the driving signal outputted through the driving circuit 2 To change the gain of the optical amplifier to degrade the optical signal
Matching with the best optimal working point to output the matched degraded optical signal; the degraded optical signal and the pumping signal are coupled into one optical signal through the multiplexer, and all-optical regeneration is performed in the highly nonlinear optical fiber, and then the solution is solved. The multiplexer demultiplexes to obtain the reproduced optical signal.
An all-optical regenerator adaptive device according to claim 1 wherein said The splitters 1 and 2 each adopt a 1/99 optical splitter.