CN104734778A - Data signal and monitoring signal sending and receiving method and device - Google Patents

Abstract

The invention discloses a method and device for sending and receiving data signals and monitoring signals, so as to avoid the configuration of complex and expensive optical coherent receivers on the monitoring nodes to receive and demodulate the monitoring signals. In the present invention, at the sending end, the data signal and monitoring signal to be sent are determined; the data signal is subjected to high-frequency coherent phase modulation, the monitoring signal is subjected to low-frequency amplitude modulation, and the amplitude-modulated monitoring signal is added to the In the phase-modulated data signal, it is sent to the receiving end. Through the present invention, when the receiving end is receiving signals, it can filter in the frequency domain through a low-pass filter to obtain a noise-added low-frequency amplitude-modulated monitoring signal, which is received by an ordinary low-frequency optical detector, and then The monitoring signal can be obtained by low-frequency electrical domain signal processing, which avoids the configuration of complex and expensive optical coherent receivers on the monitoring node for receiving and demodulating the monitoring signal.

Description

A method and device for sending and receiving data signals and monitoring signals

technical field

The invention relates to the field of communication technology, in particular to a method and device for sending and receiving data signals and monitoring signals.

Background technique

The explosive growth of broadband demand has brought enormous pressure to the transmission network of the optical communication system. In order to increase the transmission capacity, a high-speed transmission system is required.

At present, in high-speed transmission systems, high-speed optical coherent phase modulation technology is widely used at the transmitting end, and the monitoring signal and data signal in the optical communication system are modulated and processed by the same modulation method, and then transmitted to the receiving end together. Figure 1 shows a schematic diagram of the time-domain signal obtained after the monitoring signal and data signal are modulated by high-speed optical coherent phase modulation technology. Using high-speed optical coherent phase modulation technology for modulation requires complex and expensive optical coherent receivers and high-frequency electrical domain signal processing to demodulate the original signal. However, in order to realize the manageability and controllability of the transmission network, in the process of transmitting the modulated monitoring signal and the data signal together, many monitoring nodes (intermediate nodes) of the transmission network need to demodulate the monitoring signal. The monitoring signal and the data signal are transmitted together, so complex and expensive optical coherent receivers need to be configured on the monitoring node and complete high-frequency electrical domain signal processing, resulting in high costs.

Contents of the invention

The purpose of the present invention is to provide a method and device for sending and receiving data signals and monitoring signals, so as to avoid the use of optical coherent receivers and high-frequency electrical domain signal processing at monitoring nodes.

On the one hand, an embodiment of the present invention provides a method for sending a data signal and a monitoring signal, including:

Determine the data signals and monitoring signals that need to be sent;

High-frequency coherent phase modulation is performed on the data signal, and low-frequency amplitude modulation is performed on the monitoring signal, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal and sent to the receiving end.

The method for transmitting data signals and monitoring signals provided by the present invention performs high-frequency coherent phase modulation on the data signals, performs low-frequency amplitude modulation on the monitoring signals, and adds the amplitude-modulated monitoring signals to the phase-modulated data signals to the receiver. When the receiving end is receiving the signal, it can be filtered in the frequency domain through a low-pass filter to obtain a low-frequency amplitude-modulated monitoring signal with noise, which is received by an ordinary low-frequency optical detector, and then carried out The monitoring signal can be obtained by low-frequency electrical domain signal processing, which avoids the configuration of complex and expensive optical coherent receivers on the monitoring node to receive and demodulate the monitoring signal.

Optionally, in the embodiment of the present invention, a time-division multiplexing method may be adopted to perform high-frequency coherent phase modulation on the data signal, perform low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase modulated data signal.

In the embodiment of the present invention, time-division multiplexing is used to add the low-frequency amplitude-modulated monitoring signal to the high-frequency coherent phase-modulated data signal, so after completing the phase modulation of the data signal, the same MZ modulator can be used to monitor The signal undergoes low-frequency amplitude modulation.

Specifically, the time-division multiplexing method is used to perform high-frequency coherent phase modulation on the data signal, perform low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase-modulated data signal. , including:

In the first time period, adjusting the modulation voltage of the MZ modulator to be a phase-modulated modulation voltage, performing high-frequency coherent phase modulation on the data signal to obtain a phase-modulated data signal;

In a second time period different from the first time period, adjusting the modulation voltage of the MZ modulator to an amplitude modulated modulation voltage, performing low-frequency amplitude modulation on the monitoring signal to obtain an amplitude modulated monitoring signal;

The amplitude modulated monitoring signal is appended to the phase modulated data signal.

In the embodiment of the present invention, according to different modulation modes required, the modulation voltage of the same MZ modulator is adjusted in different time periods to realize phase modulation and amplitude modulation, which can simplify the structure of the transmitter device.

Optionally, in this embodiment of the present invention, a low-frequency amplitude signal envelope modulation method may be used to perform low-frequency amplitude modulation on the monitoring signal, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal.

In the embodiment of the present invention, the low-frequency amplitude signal envelope modulation mode is adopted, which can enable phase modulation and amplitude modulation to be performed simultaneously and improve transmission efficiency.

Specifically, the low-frequency amplitude modulation is performed on the monitoring signal by using a low-frequency amplitude signal envelope modulation method, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal, specifically including:

performing high-frequency coherent phase modulation on the data signal through a modulator for phase modulation to obtain a phase-modulated data signal;

performing low-frequency amplitude modulation on the monitoring signal through a modulator performing envelope modulation of a low-frequency amplitude signal to obtain an amplitude-modulated monitoring signal;

The amplitude modulated monitoring signal is appended to the phase modulated data signal.

In the embodiment of the present invention, phase modulation and amplitude modulation are performed separately through different modulators. In the embodiment of the present invention, a low-frequency amplitude signal envelope modulation mode is adopted, which can enable phase modulation and amplitude modulation to be performed simultaneously and improve transmission efficiency.

On the other hand, an embodiment of the present invention provides a method for receiving a data signal and a monitoring signal, for receiving the data signal and the monitoring signal sent by the above-mentioned sending method, including:

Filtering the high-frequency phase modulation data signal with the low-frequency amplitude modulation monitoring signal added in the frequency domain by using a low-pass optical filter to obtain the low-frequency amplitude modulation monitoring signal with noise added;

The noise-added low-frequency amplitude modulation monitoring signal is received by a photodetector, and electrical domain signal processing is performed on the noise-added low-frequency amplitude modulation monitoring signal to obtain a monitoring signal.

The embodiments of the present invention adopt the above method to receive the data signal and the monitoring signal, and filter in the frequency domain through a low-pass filter to obtain a low-frequency amplitude-modulated monitoring signal with noise, which is carried out by an ordinary low-frequency optical detector. Receive, and then perform low-frequency electric domain signal processing to obtain the monitoring signal, avoiding the configuration of complex and expensive optical coherent receivers on the monitoring node for receiving and demodulating the monitoring signal.

In another aspect, an embodiment of the present invention provides a device for sending data signals and monitoring signals, including:

a determining unit, configured to determine the data signal and the monitoring signal to be sent;

The sending unit is used for performing high-frequency coherent phase modulation on the data signal, performing low-frequency amplitude modulation on the monitoring signal, adding the amplitude-modulated monitoring signal to the phase-modulated data signal, and sending it to the receiving end.

In the data signal and monitoring signal sending device provided by the present invention, the sending unit performs high-frequency coherent phase modulation on the data signal, performs low-frequency amplitude modulation on the monitoring signal, and adds the amplitude-modulated monitoring signal to the phase-modulated data signal, Send it to the receiving end, so that when the receiving end is receiving the signal, it can be filtered in the frequency domain through a low-pass filter, and the monitoring signal with additional noise and low-frequency amplitude modulation can be obtained, received by an ordinary optical detector, and then carried out The monitoring signal can be obtained by low-frequency electrical domain signal processing, which avoids the configuration of complex and expensive optical coherent receivers on the monitoring node to receive and demodulate the monitoring signal.

Optionally, the sending unit is specifically used for:

Time-division multiplexing is used to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase-modulated data signal.

In the embodiment of the present invention, time-division multiplexing is used to add the low-frequency amplitude-modulated monitoring signal to the high-frequency coherent phase-modulated data signal, so after completing the phase modulation of the data signal, the same MZ modulator can be used to monitor The signal undergoes low-frequency amplitude modulation.

Specifically, the sending unit is specifically used for:

In the first time period, adjusting the modulation voltage of the MZ modulator to be a phase-modulated modulation voltage, performing high-frequency coherent phase modulation on the data signal to obtain a phase-modulated data signal;

In a second time period different from the first time period, adjusting the modulation voltage of the MZ modulator to an amplitude modulated modulation voltage, performing low-frequency amplitude modulation on the monitoring signal to obtain an amplitude modulated monitoring signal;

The amplitude modulated monitoring signal is appended to the phase modulated data signal.

In the embodiment of the present invention, according to different modulation modes required, the modulation voltage of the same MZ modulator is adjusted in different time periods to realize phase modulation and amplitude modulation, which can simplify the structure of the transmitter device.

Preferably, the sending unit is specifically used for:

The monitoring signal is modulated in a low-frequency amplitude signal envelope modulation manner, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal.

In the embodiment of the present invention, the low-frequency amplitude signal envelope modulation mode is adopted, which can enable phase modulation and amplitude modulation to be performed simultaneously and improve transmission efficiency.

Specifically, the sending unit is specifically used for:

performing high-frequency coherent phase modulation on the data signal through a modulator for phase modulation to obtain a phase-modulated data signal;

performing low-frequency amplitude modulation on the monitoring signal through a modulator performing envelope modulation of a low-frequency amplitude signal to obtain an amplitude-modulated monitoring signal;

The amplitude modulated monitoring signal is appended to the phase modulated data signal.

In the embodiment of the present invention, phase modulation and amplitude modulation are performed separately through different modulators. In the embodiment of the present invention, a low-frequency amplitude signal envelope modulation mode is adopted, which can enable phase modulation and amplitude modulation to be performed simultaneously and improve transmission efficiency.

The embodiment of the present invention also provides a data signal and monitoring signal receiving device, which is used to receive the data signal and monitoring signal sent by the above sending device, including:

A low-pass filter is used to filter the high-frequency phase modulation data signal with the low-frequency amplitude modulation monitoring signal added in the frequency domain to obtain the low-frequency amplitude modulation monitoring signal with noise added;

a photodetector for receiving said additional noisy low frequency amplitude modulated monitoring signal;

The low-frequency electrical domain signal processor is configured to perform electrical domain signal processing on the noise-added low-frequency amplitude modulation monitoring signal to obtain the monitoring signal.

The receiving device of the data signal and the monitoring signal provided by the embodiment of the present invention performs filtering in the frequency domain through a low-pass filter to obtain the monitoring signal of low-frequency amplitude modulation with noise added, and receives it through a common low-frequency optical detector , and then the monitoring signal can be obtained by processing the low-frequency electrical domain signal by the low-frequency electrical domain signal processor, which avoids the configuration of complex and expensive optical coherent receivers on the monitoring node to receive and demodulate the monitoring signal.

Description of drawings

Fig. 1 is a schematic diagram of time-domain signals obtained after monitoring signals and data signals are modulated by high-speed optical coherent phase modulation technology in the prior art;

FIG. 2 is a flowchart of a method for sending data signals and monitoring signals provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of the configuration of a transmitter modulator using a time division multiplexing mode provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of the operation of the MZ modulator for applying a modulation voltage according to an embodiment of the present invention;

5 is a schematic diagram in the time domain after the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal in a time-division multiplexed manner according to an embodiment of the present invention;

6 is a schematic diagram in the frequency domain after the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal in a time-division multiplexing manner provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of the configuration of a transmitter modulator using an amplitude envelope modulation method provided by an embodiment of the present invention;

FIG. 8 is a working schematic diagram of an MZ modulator applying a modulation voltage when phase modulation is performed according to an embodiment of the present invention;

FIG. 9 is a working schematic diagram of an MZ modulator applying a modulation voltage when amplitude envelope modulation is performed according to an embodiment of the present invention;

10 is a schematic diagram in the time domain after the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal by using the low-frequency amplitude envelope modulation method according to an embodiment of the present invention;

11 is a schematic diagram in the frequency domain after the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal by using the low-frequency amplitude envelope modulation method provided by the embodiment of the present invention;

FIG. 12 is a flow chart of receiving data signals and monitoring signals provided by an embodiment of the present invention;

FIG. 13 is a schematic diagram of the structure of the sending device for the data signal and the monitoring signal provided by the embodiment of the present invention;

FIG. 14 is a schematic diagram of a receiving device for data signals and monitoring signals provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

An embodiment of the present invention provides a method for transmitting data signals and monitoring signals. In this method, high-frequency coherent phase modulation is performed on the data signals to obtain high-frequency coherent phase-modulated data signals, so as to meet the requirements of high data signal transmission rates. needs; the transmission rate required for the monitoring signal is low, so low-frequency amplitude modulation is performed on the monitoring signal to obtain a low-frequency amplitude-modulated monitoring signal; finally, the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal, Send it to the receiving end together, so that after the receiving end can filter through a low-pass filter, it can be accepted by ordinary photodetectors, and then perform electrical domain signal processing to obtain monitoring signals, without the need to configure complex and expensive optical coherent receivers The reception and demodulation of the monitoring signal is performed.

Embodiment one

Embodiment 1 of the present invention provides a method for sending data signals and monitoring signals. The specific implementation is shown in FIG. 2, including:

S101: Determine data signals and monitoring signals that need to be sent.

S102: Perform high-frequency coherent phase modulation on the data signal to obtain a phase-modulated data signal.

S103: Perform low-frequency amplitude modulation on the monitoring signal to obtain an amplitude-modulated monitoring signal.

S104: Add the amplitude-modulated monitoring signal to the phase-modulated data signal, and send it to the receiving end.

It should be noted that the execution order of S102 and S103 in the embodiment of the present invention is not in particular order, and the amplitude modulation may be performed on the monitoring signal first, or the phase modulation may be performed on the data signal first.

Embodiments of the present invention In the following, a specific implementation method of performing high-frequency coherent phase modulation on a data signal, performing low-frequency amplitude modulation on a monitoring signal, and adding the amplitude-modulated monitoring signal to the phase-modulated data signal will be described in detail.

the first way

Time-division multiplexing is used to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase-modulated data signal.

In the embodiment of the present invention, an I/Q modulator is set at the transmitting end, and the modulation voltage of the MZ (Mach-Zender, Mach-Zehnder) modulator in the I/Q modulator is changed according to different modulation modes, so as to realize the modulation of the data signal. High-frequency coherent phase modulation and low-frequency amplitude modulation of monitoring signals.

Specifically, in the embodiment of the present invention, time-division multiplexing is adopted to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase-modulated data signal. , as follows:

A: In the first time period, adjust the modulation voltage of the MZ modulator to the modulation voltage of phase modulation, perform high-frequency coherent phase modulation on the data signal, and obtain the data signal of phase modulation;

B: In the second time period different from the first time period, adjust the modulation voltage of the MZ modulator to be the modulation voltage of amplitude modulation, perform low-frequency amplitude modulation on the monitoring signal, and obtain the monitoring signal of amplitude modulation;

C: Adding the amplitude modulated monitoring signal to the phase modulated data signal.

Specifically, in the embodiment of the present invention, phase modulation and amplitude modulation are realized by two MZ modulators and a Π/2 phase shifter as an example. Of course, it is not limited thereto, and the number of MZ modulators can be different. The number of MZ modulators in the embodiment of the present invention, for example, can be 4 MZ modulators, as shown in FIG. 3 , which is a schematic diagram of the configuration of the modulator at the transmitting end provided by the embodiment of the present invention. When performing phase modulation on the data signal, the changing voltage of the two MZ modulators is the voltage in the entire cycle, that is, in the first time period, the changing voltages of the two MZ modulators are the voltages for phase modulation, and the two MZ modulators The modulator modulates the determined data signal to be transmitted, and generates two orthogonal signals of Imphase and Quadrature respectively, and one of the signals is phase-shifted by a π/2 phase shifter, and finally the two signals are combined by a coupler , to obtain a phase-modulated data signal. For example, when the QPSK modulation format is used for phase modulation, the phases of "00", "01", "10" and "11" can be generated.

The embodiment of the present invention adopts the method of time-division multiplexing to add the low-frequency amplitude-modulated monitoring signal to the high-frequency coherent phase-modulated data signal, so after the phase modulation of the data signal is completed, the same MZ modulator can be used to perform the monitoring signal. Low-frequency amplitude modulation, as shown in FIG. 4 , is a working schematic diagram of applying a modulation voltage to the MZ modulator provided by the embodiment of the present invention. In the embodiment of the present invention, when low-frequency amplitude modulation is performed on the monitoring signal, the changing voltage of the two MZ modulators is the voltage within half a cycle, that is, the changing voltage of the two MZ modulators is The amplitude-modulated voltage performs low-frequency amplitude modulation on the determined monitoring signal to be transmitted to generate a conversion between the amplitude level "0" and "1", and finally obtains the amplitude-modulated monitoring signal.

Through the above-mentioned time-division multiplexing method, the monitoring signal of low-frequency amplitude modulation can be added to the data signal of high-frequency coherent phase modulation. As shown in FIG. Schematic diagram of the monitor signal in the time domain after being appended to the high-frequency coherent phase-modulated data signal. As shown in FIG. 6 , it is a schematic diagram in the frequency domain after the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal in a time-division multiplexing manner provided by the embodiment of the present invention.

It should be noted that in the embodiment of the present invention, the time at which the voltage of the MZ modulator for phase modulation changes and the time at which the voltage of the MZ modulator for amplitude modulation changes can be changed. shorter time.

the second way

Low-frequency amplitude modulation is carried out on the monitoring signal by adopting a low-frequency amplitude signal envelope modulation method, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal.

In the embodiment of the present invention, a modulator for phase modulation is set at the transmitting end to perform high-speed coherent phase modulation on the data signal, and to perform low-frequency amplitude envelope modulation on the monitoring signal through a modulator different from the modulator for phase modulation. At the same time, the modulation of the corresponding modulation mode is performed to improve the transmission efficiency. As shown in Figure 7, the transmitter structure adopted at the transmitting end in the embodiment of the present invention includes three MZ modulators and a Π/2 phase shifter, wherein two of the three MZ modulators are used to determine the The data signal to be transmitted is subjected to high-frequency amplitude modulation. The specific modulation method can refer to the phase modulation process of the data signal in the above-mentioned time division multiplexing method. The specific working diagram of applying the modulation voltage to the MZ modulator is shown in Figure 8. In the embodiment of the present invention, when the two MZ modulators performing phase modulation perform high-frequency coherent phase modulation on the data signal, the other MZ modulator can perform low-frequency amplitude envelope modulation on the determined monitoring signal to be transmitted to obtain amplitude modulation The monitoring signal of the MZ modulator is shown in Figure 9 when the modulation voltage is applied when the MZ modulator performs amplitude envelope modulation.

In the embodiment of the present invention, low-frequency amplitude modulation is performed on the monitoring signal by adopting the low-frequency amplitude signal envelope modulation method, and after the amplitude-modulated monitoring signal is added to the phase-modulated data signal, the schematic diagram in the time domain is shown in Figure 10 The schematic diagram in the frequency domain is shown in Figure 11.

The method for transmitting data signals and monitoring signals provided by the present invention performs high-frequency coherent phase modulation on the data signals, performs low-frequency amplitude modulation on the monitoring signals, and adds the amplitude-modulated monitoring signals to the phase-modulated data signals to the receiver. When the receiving end is receiving the signal, it can be filtered in the frequency domain through a low-pass filter to obtain a low-frequency amplitude-modulated monitoring signal with noise, which is received by an ordinary optical detector, and then low-frequency electrical The monitoring signal can be obtained by domain signal processing, which avoids the configuration of complex and expensive optical coherent receivers on the monitoring node to receive and demodulate the monitoring signal.

Embodiment two

Based on the sending method of the data signal and the monitoring signal provided in the first embodiment, the second embodiment of the present invention provides a receiving method of the data signal and the monitoring signal, which is used to receive the data signal and the monitoring signal sent by the sending method in the first embodiment , it can be seen from Figure 6 and Figure 11 that after the low-frequency amplitude-modulated monitoring signal is added to the high-frequency coherent phase-modulated data signal, the monitoring signal is mainly concentrated in the low frequency. The high-frequency phase modulation data signal of the amplitude modulation monitoring signal is filtered, so that the filtered signal is mainly a low-frequency amplitude modulation monitoring signal, and some low-frequency components and noise of the high-frequency data signal may be added. Therefore, in the embodiment of the present invention, The specific implementation process of the monitoring signal is shown in Figure 12, including:

S201: Filter the high-frequency phase-modulated data signal added with the low-frequency amplitude-modulated monitoring signal in the frequency domain by using a low-pass optical filter to obtain a low-frequency amplitude-modulated monitoring signal added with noise.

S202: Receive the noise-added low-frequency amplitude modulation monitoring signal obtained in S201 through the photodetector.

S203: Perform electrical domain signal processing on the noise-added low-frequency amplitude modulation monitoring signal to obtain the monitoring signal.

The embodiments of the present invention adopt the above method to receive the data signal and the monitoring signal, and filter in the frequency domain through a low-pass filter to obtain a low-frequency amplitude-modulated monitoring signal with noise, which is carried out by an ordinary low-frequency optical detector. Receive, and then perform low-frequency electric domain signal processing to obtain the monitoring signal, avoiding the configuration of complex and expensive optical coherent receivers on the monitoring node for receiving and demodulating the monitoring signal.

Embodiment three

Based on the method for sending a data signal and a monitoring signal provided in Embodiment 1, an embodiment of the present invention provides a device for sending a data signal and a monitoring signal. The composition of the device, as shown in FIG. 13 , includes:

The determining unit 1 is configured to determine the data signal and monitoring signal to be sent.

The sending unit 2 is used to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation on the monitoring signal, add the amplitude-modulated monitoring signal to the phase-modulated data signal, and send it to the receiving end.

Specifically, the sending unit 2 is specifically used for:

Time-division multiplexing is used to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase-modulated data signal.

Further, the sending unit 2 is specifically used for:

In the first time period, adjusting the modulation voltage of the MZ modulator to be a phase-modulated modulation voltage, performing high-frequency coherent phase modulation on the data signal to obtain a phase-modulated data signal;

In a second time period different from the first time period, adjusting the modulation voltage of the MZ modulator to an amplitude modulated modulation voltage, performing low-frequency amplitude modulation on the monitoring signal to obtain an amplitude modulated monitoring signal;

The amplitude modulated monitoring signal is appended to the phase modulated data signal.

Specifically, the sending unit 2 is specifically used for:

A low-frequency amplitude signal envelope modulation method is used to modulate the monitoring signal, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal.

Further, the sending unit 2 is specifically used for:

performing high-frequency coherent phase modulation on the data signal through a modulator for phase modulation to obtain a phase-modulated data signal;

performing low-frequency amplitude modulation on the monitoring signal through a modulator performing envelope modulation of a low-frequency amplitude signal to obtain an amplitude-modulated monitoring signal;

The amplitude modulated monitoring signal is appended to the phase modulated data signal.

In the data signal and monitoring signal sending device provided by the present invention, the sending unit performs high-frequency coherent phase modulation on the data signal, performs low-frequency amplitude modulation on the monitoring signal, and adds the amplitude-modulated monitoring signal to the phase-modulated data signal, Send it to the receiving end, so that when the receiving end is receiving the signal, it can be filtered in the frequency domain through a low-pass filter, and the monitoring signal with additional noise and low-frequency amplitude modulation can be obtained, received by an ordinary optical detector, and then carried out The monitoring signal can be obtained by low-frequency electrical domain signal processing, which avoids the configuration of complex and expensive optical coherent receivers on the monitoring node to receive and demodulate the monitoring signal.

Embodiment Four

Based on the data signal provided in the second embodiment and the receiving method after monitoring and absorption, the embodiment of the present invention provides a receiving device for the data signal and the monitoring signal, which is used for receiving the data signal and monitoring signal sent by the sending device involved in the third embodiment. Signal. As shown in Figure 14, including:

The low-pass filter 3 is used to filter the high-frequency phase-modulated data signal added with the low-frequency amplitude-modulated monitoring signal in the frequency domain to obtain the low-frequency amplitude-modulated monitoring signal added with noise.

The photodetector 4 is used for receiving the low-frequency amplitude modulation monitoring signal with noise added thereto.

The low-frequency electrical domain signal processor 5 is configured to perform electrical domain signal processing on the noise-added low-frequency amplitude modulation monitoring signal to obtain the monitoring signal.

The receiving device of the data signal and the monitoring signal provided by the embodiment of the present invention performs filtering in the frequency domain through a low-pass filter to obtain the monitoring signal of low-frequency amplitude modulation with noise added, and receives it through a common low-frequency optical detector , and then the monitoring signal can be obtained by processing the low-frequency electrical domain signal by the low-frequency electrical domain signal processor 5, which avoids disposing complex and expensive optical coherent receivers on the monitoring node to receive and demodulate the monitoring signal.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (12)

1. A method for transmitting data signals and monitoring signals, comprising: Determine the data signals and monitoring signals that need to be sent; High-frequency coherent phase modulation is performed on the data signal, and low-frequency amplitude modulation is performed on the monitoring signal, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal and sent to the receiving end. 2. The method according to claim 1, wherein the method of time-division multiplexing is used to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation to the monitoring signal, and the amplitude-modulated The monitoring signal is appended to the phase-modulated data signal. 3. The method according to claim 2, wherein the method of time-division multiplexing is used to perform high-frequency coherent phase modulation on the data signal, and low-frequency amplitude modulation to the monitoring signal, and pass through the amplitude The modulated monitoring signal is appended to the phase modulated data signal and consists of: In the first time period, adjusting the modulation voltage of the Mach-Zehnder MZ modulator to be a phase-modulated modulation voltage, performing high-frequency coherent phase modulation on the data signal to obtain a phase-modulated data signal; In a second time period different from the first time period, adjusting the modulation voltage of the MZ modulator to an amplitude modulated modulation voltage, performing low-frequency amplitude modulation on the monitoring signal to obtain an amplitude modulated monitoring signal; The amplitude modulated monitoring signal is appended to the phase modulated data signal. 4. The method according to claim 1, wherein the monitoring signal is subjected to low-frequency amplitude modulation using a low-frequency amplitude signal envelope modulation method, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal . 5. The method according to claim 4, wherein the low-frequency amplitude modulation method is used to carry out low-frequency amplitude modulation on the monitoring signal, and the amplitude-modulated monitoring signal is added to the phase-modulated data Signals include: performing high-frequency coherent phase modulation on the data signal through a modulator for phase modulation to obtain a phase-modulated data signal; performing low-frequency amplitude modulation on the monitoring signal through a modulator that performs envelope modulation of the low-frequency amplitude signal to obtain an amplitude-modulated monitoring signal; The amplitude modulated monitoring signal is appended to the phase modulated data signal. 6. A method for receiving data signals and monitoring signals, for receiving data signals and monitoring signals sent by the sending method according to any one of claims 1-5, characterized in that, comprising: Filtering the high-frequency phase modulation data signal with the low-frequency amplitude modulation monitoring signal added in the frequency domain by using a low-pass optical filter to obtain the low-frequency amplitude modulation monitoring signal with noise added; The noise-added low-frequency amplitude modulation monitoring signal is received by a photodetector, and electrical domain signal processing is performed on the noise-added low-frequency amplitude modulation monitoring signal to obtain a monitoring signal. 7. A sending device for data signals and monitoring signals, characterized in that it comprises: a determining unit, configured to determine the data signal and the monitoring signal to be sent; The sending unit is used for performing high-frequency coherent phase modulation on the data signal, performing low-frequency amplitude modulation on the monitoring signal, adding the amplitude-modulated monitoring signal to the phase-modulated data signal, and sending it to the receiving end. 8. The sending device according to claim 7, wherein the sending unit is specifically used for: Time-division multiplexing is used to perform high-frequency coherent phase modulation on the data signal, low-frequency amplitude modulation on the monitoring signal, and add the amplitude-modulated monitoring signal to the phase-modulated data signal. 9. The sending device according to claim 8, wherein the sending unit is specifically used for: In the first time period, adjusting the modulation voltage of the Mach-Zehnder MZ modulator to be a phase-modulated modulation voltage, performing high-frequency coherent phase modulation on the data signal to obtain a phase-modulated data signal; In a second time period different from the first time period, adjusting the modulation voltage of the MZ modulator to an amplitude modulated modulation voltage, performing low-frequency amplitude modulation on the monitoring signal to obtain an amplitude modulated monitoring signal; The amplitude modulated monitoring signal is appended to the phase modulated data signal. 10. The sending device according to claim 7, wherein the sending unit is specifically used for: The monitoring signal is modulated in a low-frequency amplitude signal envelope modulation manner, and the amplitude-modulated monitoring signal is added to the phase-modulated data signal. 11. The sending device according to claim 10, wherein the sending unit is specifically used for: performing high-frequency coherent phase modulation on the data signal through a modulator for phase modulation to obtain a phase-modulated data signal; performing low-frequency amplitude modulation on the monitoring signal through a modulator performing envelope modulation of a low-frequency amplitude signal to obtain an amplitude-modulated monitoring signal; The amplitude modulated monitoring signal is appended to the phase modulated data signal. 12. A receiving device for data signals and monitoring signals, used for receiving data signals and monitoring signals sent by the sending device according to any one of claims 7-11, characterized in that it comprises: A low-pass filter is used to filter the high-frequency phase modulation data signal with the low-frequency amplitude modulation monitoring signal added in the frequency domain to obtain the low-frequency amplitude modulation monitoring signal with noise added; a photodetector for receiving said additional noisy low frequency amplitude modulated monitoring signal; The low-frequency electrical domain signal processor is configured to perform electrical domain signal processing on the noise-added low-frequency amplitude modulation monitoring signal to obtain the monitoring signal.