WO2022083254A1 - Frequency response estimation method and apparatus - Google Patents

Abstract

Provided are a frequency response estimation method and apparatus, a spectrum measurement method and apparatus, and an optical communication device. The frequency response estimation method is executed in a communication apparatus that is provided with a receiving unit. The frequency response estimation method comprises: acquiring N first optical signals, wherein the N first optical signals correspond to N frequency points within a target frequency range on a one-to-one basis, N is an integer greater than or equal to 2, and the first optical signals are sent by a sending unit and are determined by means of optical signals received by the receiving unit; and determining a first frequency response according to signal parameters of the N first optical signals, wherein the first frequency response comprises a frequency response, within the target frequency range, of the sending unit, a first response value corresponding to a first frequency point in the first frequency response is determined according to signal parameters of the first optical signal corresponding to a second frequency point, and the signal parameters comprise at least one of an amplitude or a phase. Therefore, it is not necessary to use an additional measurement device, such that the measurement costs can be reduced.

Description

Method and apparatus for frequency response estimation

This application claims the priority of the Chinese patent application with the application number 202011143281.8 and the application title "Method and Apparatus for Frequency Response Estimation" filed with the State Intellectual Property Office of China on October 23, 2020, the entire contents of which are incorporated herein by reference Applying.

technical field

The embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for estimating frequency responses of a receiving unit and a sending unit in an optical communication system, and a method and apparatus for measuring the spectrum of an optical signal sent by the sending unit.

Background technique

In the process of transmitting or receiving an optical signal, the optical signal needs to be processed by a plurality of units (or devices, components or modules), devices or modules. The amount of change (eg, the amount of phase change and/or the amount of change in amplitude) between the input and output signals at different frequencies is also different for each unit, that is, the amount of change between the input and output signals varies with frequency Change, the relationship between the change and the frequency is called the frequency response.

For optical transceivers, the frequency response of the optical module is a very important parameter. Especially in large-bandwidth and high-speed signal transmission, it is necessary to estimate (or measure) the frequency responses of the transmitting unit and the receiving and transmitting units respectively, and then compensate the transmitting unit and the receiving unit respectively, so as to improve the transmission performance of the system.

In the prior art, the optical signal sent by the transmitting unit can be first received by the receiving unit of the optical module, and then the frequency response of the optical signal can be detected, so that the frequency response includes the frequency responses of both the receiving unit and the transmitting unit (denoted as frequency In response to a), a noise signal is generated by an additional measuring device, and the noise signal is received by the receiving unit to determine the frequency response of the receiving unit (denoted, frequency response b). On the one hand, the prior art needs to be implemented by measuring equipment capable of generating noise signals, which increases the cost and conditional constraints of frequency response estimation. On the other hand, since the measurement device itself also has a frequency response, the frequency response of the transmitting unit cannot be accurately obtained based on the frequency response a and the frequency response b obtained as described above.

Therefore, it is desirable to provide a technology that can accurately and reliably determine the frequency response of the transmitting unit and reduce the measurement cost.

SUMMARY OF THE INVENTION

The present application provides a method and device for estimating frequency response and an optical communication device, which can accurately and reliably determine the frequency response of a transmitting unit and reduce measurement costs.

In a first aspect, a method for estimating frequency response is provided, executed in a communication device configured with a receiving unit, the method comprising: acquiring N first optical signals, the N first optical signals being within a target frequency range One-to-one correspondence with the N frequency points, where N is an integer greater than or equal to 2, the first optical signal is determined based on the optical signal sent by the transmitting unit and received by the receiving unit; The signal parameters of the optical signal determine a first frequency response, where the first frequency response includes the frequency response of the transmitting unit within the target frequency range, wherein the first frequency response corresponds to the first frequency point in the first frequency response. A response value is determined according to a signal parameter of the first optical signal corresponding to the second frequency point, where the signal parameter includes at least one of amplitude or phase.

According to the solution provided by the present application, when it is necessary to estimate the frequency response of the transmitting unit within the target frequency range, the first optical signals whose center frequencies are corresponding to multiple frequency points within the target frequency range are obtained respectively. The frequency response of the transmitting unit within the target frequency range is determined by the first optical signal, and the measurement cost can be reduced without using additional measurement equipment.

In this application, "signal parameters of the first optical signal" can also be understood as the digital value of the fundamental frequency generated by the first optical signal after demodulation, down-conversion (or beat frequency), amplification, and analog-to-digital conversion. Signal parameter of the signal.

Wherein, the first frequency point is any frequency point among the N frequency points.

As an example and not a limitation, the frequency value of the first frequency point is twice the frequency value of the second frequency point.

In an implementation manner, the determining the first frequency response according to the signal parameters of the N first optical signals includes: according to the first one of the signal parameters of the first optical signals corresponding to the second frequency points parameter value, to determine the first response value, and the first parameter value is the parameter value corresponding to the first frequency point.

For example, the determining the first response value according to the first parameter value in the signal parameters of the first optical signal corresponding to the second frequency point includes: determining the first response value according to the first parameter value The first difference between the response value and the second response value, the second response value is the response value corresponding to the reference frequency point; according to the first difference and the second response value, determine the first Response.

In an implementation manner, the reference frequency point includes a zero frequency point.

As an example and not a limitation, the frequency interval between two adjacent frequency points in the N frequency points is the same.

The smaller the frequency interval, the higher the accuracy of the estimation of the frequency response.

In an implementation manner, the method further includes: receiving, by the receiving unit, a second optical signal sent by the sending unit, where the bandwidth of the second optical signal corresponds to the target frequency range; according to the Signal parameters of the second optical signal to determine a second frequency response, where the second frequency response includes the frequency response of the transmitting unit within the target frequency range and the frequency response of the receiving unit within the target frequency range; according to the The first frequency response and the second frequency response determine a third frequency response, the third frequency response including the frequency response of the receiving unit within the target frequency range.

Therefore, the frequency response of the receiving unit can be determined, which further improves the practicability of the present application.

In an implementation manner, the acquiring N first optical signals includes: receiving, by the receiving unit, a third optical signal sent by the sending unit, the bandwidth of the third optical signal being the same as the target frequency range Correspondingly: beat frequencies of the first optical signals based on the N first local oscillator signals, respectively, to obtain the N first optical signals, the center frequencies of the N first local oscillator signals and the N first optical signals The frequencies correspond one-to-one.

Therefore, it can be applied to the case where the transmission frequency of the transmission unit is fixed, thereby improving the compatibility and practicability of the present application.

In another implementation manner, the acquiring the N first optical signals includes: receiving, by the receiving unit, N fourth optical signals sent by the sending unit, and the center frequencies of the N fourth optical signals are One-to-one correspondence with the N frequencies; beat frequencies are performed on the N fourth optical signals based on the second local oscillator signal, respectively, to obtain the N first optical signals.

Therefore, it can be applied to the case where the frequency of the local oscillator signal of the receiving unit is fixed, thereby improving the compatibility and practicability of the present application.

By way of example and not limitation, the communication apparatus further includes the sending unit.

In a second aspect, a method for spectral measurement is provided, which is performed in a communication device configured with a receiving unit, the method comprising: acquiring N first optical signals, the N first optical signals and a target frequency range The N frequency points are in one-to-one correspondence, N is an integer greater than or equal to 2, the first optical signal is determined based on the optical signal sent by the transmitting unit and received by the receiving unit; according to the N first optical signals The amplitude of the signal, to determine a first spectrum, where the first spectrum includes the spectrum of the optical signal corresponding to the target frequency range sent by the sending unit, wherein the first amplitude corresponding to the first frequency point in the first spectrum is determined according to the amplitude of the first optical signal corresponding to the second frequency point.

According to the solution provided by the present application, when it is necessary to measure the spectrum of the optical signal within the target frequency range of the transmitting unit, the first optical signals whose center frequencies are corresponding to multiple frequency points within the target frequency range are obtained respectively. The multiple first optical signals determine the spectrum of the optical signal corresponding to the target frequency range sent by the sending unit, and additional measurement equipment is not required, which can reduce measurement costs.

Wherein, the first frequency point is any frequency point among the N frequency points.

As an example and not a limitation, the frequency value of the first frequency point is twice the frequency value of the second frequency point.

In an implementation manner, the determining the first spectrum according to the amplitudes of the N first optical signals includes: determining the first spectrum according to a first value in the first optical signal corresponding to the second frequency point The first amplitude, where the first value is the value of the amplitude corresponding to the first frequency point in the first optical signal corresponding to the second frequency point.

For example, determining the first amplitude by the root according to a first value in the first optical signal corresponding to the second frequency point includes: determining the first amplitude and the second amplitude according to the first value The second amplitude is the amplitude corresponding to the 0 frequency point; the first amplitude is determined according to the first difference and the second amplitude.

As an example and not a limitation, the frequency interval between two adjacent frequency points in the N frequency points is the same.

The smaller the frequency interval, the higher the accuracy of the estimation of the frequency response.

In an implementation manner, the acquiring N first optical signals includes: receiving, by the receiving unit, a third optical signal sent by the sending unit, the bandwidth of the third optical signal being the same as the target frequency range Correspondingly: beat frequencies of the first optical signals based on the N first local oscillator signals, respectively, to obtain the N first optical signals, the center frequencies of the N first local oscillator signals and the N first optical signals The frequencies correspond one-to-one.

Therefore, it can be applied to the case where the transmission frequency of the transmission unit is fixed, thereby improving the compatibility and practicability of the present application.

In another implementation manner, the acquiring the N first optical signals includes: receiving, by the receiving unit, N fourth optical signals sent by the sending unit, and the center frequencies of the N fourth optical signals are One-to-one correspondence with the N frequencies; beat frequencies are performed on the N fourth optical signals based on the second local oscillator signal, respectively, to obtain the N first optical signals.

Therefore, it can be applied to the case where the frequency of the local oscillator signal of the receiving unit is fixed, thereby improving the compatibility and practicability of the present application.

By way of example and not limitation, the communication apparatus further includes the sending unit.

In a third aspect, an apparatus for frequency response estimation is provided, the apparatus includes: a receiving unit configured to acquire N first optical signals, the N first optical signals being equal to N frequency points in a target frequency range One-to-one correspondence, N is an integer greater than or equal to 2, the first optical signal is determined based on the optical signal sent by the transmitting unit and received by the receiving unit; the processing unit is configured to determine the first optical signal according to the N first optical signals The signal parameter of the signal determines a first frequency response, where the first frequency response includes the frequency response of the transmitting unit within the target frequency range, wherein the first frequency corresponding to the first frequency point in the first frequency response The response value is determined according to a signal parameter of the second optical signal corresponding to the second frequency point, where the signal parameter includes at least one of amplitude or phase.

Wherein, the first frequency point is any frequency point among the N frequency points.

As an example and not a limitation, the frequency value of the first frequency point is twice the frequency value of the second frequency point.

As an example and not a limitation, the receiving unit is further configured to receive a second optical signal sent by the sending unit, where the bandwidth of the second optical signal corresponds to the target frequency range; the processing unit is further configured to the signal parameters of the second optical signal, determine a second frequency response, the second frequency response includes the frequency response of the transmitting unit in the target frequency range and the frequency response of the receiving unit in the target frequency range, and According to the first frequency response and the second frequency response, a third frequency response is determined, and the third frequency response includes a frequency response of the receiving unit within the target frequency range.

In an implementation manner, the receiving unit is specifically configured to receive a third optical signal sent by the sending unit, where the bandwidth of the third optical signal corresponds to the target frequency range, and is based on N first optical signals. The vibration signal beats the first optical signal to obtain the N first optical signals, and the center frequencies of the N first local vibration signals correspond to the N frequencies one-to-one.

In another implementation manner, the receiving unit is specifically configured to receive N fourth optical signals sent by the sending unit, and the center frequencies of the N fourth optical signals correspond to the N frequencies one-to-one , and the N fourth optical signals are beat frequency based on the second local oscillator signal to obtain the N first optical signals.

For example, the processing unit is specifically configured to determine the first response value according to a first parameter value in the signal parameter of the first optical signal corresponding to the second frequency point, and the first parameter value is the first parameter value of the first optical signal. The parameter value corresponding to a frequency point.

In addition, the processing unit is specifically configured to determine, according to the first parameter value, a first difference between the first response value and a second response value, where the second response value is a response corresponding to a reference frequency point value, and the first response value is determined according to the first difference value and the second response value.

As an example and not a limitation, the reference frequency point includes a 0 frequency point

As an example and not a limitation, the frequency interval between two adjacent frequency points in the N frequency points is the same.

In a possible implementation manner, the communication apparatus further includes the sending unit.

In a fourth aspect, a spectrum measurement device is provided, the device comprising: a receiving unit configured to acquire N first optical signals, the N first optical signals and N frequency points within a target frequency range one by one Correspondingly, N is an integer greater than or equal to 2, and the first optical signal is determined based on the optical signal sent by the transmitting unit and received by the receiving unit; the processing unit is configured to, according to the N first optical signals The amplitude of the first spectrum is determined, and the first spectrum includes the spectrum of the optical signal corresponding to the target frequency range sent by the sending unit, wherein the first amplitude corresponding to the first frequency point in the first spectrum is It is determined according to the amplitude of the first optical signal corresponding to the second frequency point.

Wherein, the first frequency point is any frequency point among the N frequency points.

For example, the frequency value of the first frequency point is twice the frequency value of the second frequency point

In an implementation manner, the processing unit is specifically configured to determine the first amplitude according to a first value in the first optical signal corresponding to the second frequency point, and the first value is the second frequency The value of the amplitude corresponding to the first frequency point in the first optical signal corresponding to the frequency point.

For example, the processing unit is specifically configured to determine, according to the first value, a first difference between the first amplitude and a second amplitude, where the second amplitude is an amplitude corresponding to a reference frequency point; The first difference and the second magnitude determine the first magnitude.

In an implementation manner, the reference frequency point includes a zero frequency point.

As an example and not a limitation, the frequency interval between two adjacent frequency points in the N frequency points is the same.

The smaller the frequency interval, the higher the accuracy of the estimation of the frequency response.

In an implementation manner, the receiving unit is specifically configured to receive a third optical signal sent by the sending unit, where the bandwidth of the third optical signal corresponds to the target frequency range; based on N first local oscillators The signals respectively beat the first optical signals to obtain the N first optical signals, and the center frequencies of the N first local oscillation signals correspond to the N frequencies one-to-one.

Therefore, it can be applied to the case where the transmission frequency of the transmission unit is fixed, thereby improving the compatibility and practicability of the present application.

In another implementation manner, the receiving unit is specifically configured to receive N fourth optical signals sent by the sending unit, and the center frequencies of the N fourth optical signals correspond to the N frequencies one-to-one ; respectively performing beat frequency on the N fourth optical signals based on the second local oscillator signal to obtain the N first optical signals.

Therefore, it can be applied to the case where the frequency of the local oscillator signal of the receiving unit is fixed, thereby improving the compatibility and practicability of the present application.

By way of example and not limitation, the communication apparatus further includes the sending unit.

In a fifth aspect, an optical signal processing apparatus is provided, including various modules or units for executing the method in any one of the first aspect or the second aspect and any possible implementation manner thereof.

In a sixth aspect, an optical communication device is provided, including the apparatus in any one of the third aspect or the fourth aspect and any one of possible implementations thereof.

In a seventh aspect, a processing apparatus is provided, comprising a processor, coupled to a memory, and operable to perform the method of the first aspect or the second aspect and possible implementations thereof. Optionally, the processing device further includes a memory. Optionally, the processing device further includes a communication interface to which the processor is coupled.

In one implementation, the processing device is a processing device. In this case, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the processing device is a chip or a system of chips. In this case, the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip or the chip system. The processor may also be embodied as a processing circuit or a logic circuit.

In an eighth aspect, a processing device is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the method of the first aspect or the second aspect and any possible implementations thereof is realized.

In a specific implementation process, the above-mentioned processing device may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits. The input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver, the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by a transmitter, and the input circuit and output The circuits can be different circuits or the same circuit, in which case the circuit is used as an input circuit and an output circuit respectively at different times. The embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.

In a ninth aspect, a processing apparatus is provided, including a processor and a memory. The processor is used to read instructions stored in the memory, and can receive signals through a receiver and transmit signals through a transmitter to perform the methods in the first aspect or the second aspect and various possible implementations thereof.

Optionally, there are one or more processors and one or more memories.

Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

In a specific implementation, the memory can be a non-transitory memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be separately provided on different chips Above, the embodiments of the present application do not limit the type of the memory and the setting manner of the memory and the processor.

It should be understood that the relevant data interaction process, such as sending indication information, may be a process of outputting indication information from the processor, and receiving capability information may be a process of receiving input capability information by the processor. Specifically, the data output by the processing can be output to the transmitter, and the input data received by the processor can be from the receiver. Among them, the transmitter and the receiver may be collectively referred to as a transceiver.

The processor in the ninth aspect above may be a chip, and the processor may be implemented by hardware or software. When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software When implemented, the processor can be a general-purpose processor, which is realized by reading software codes stored in a memory, and the memory can be integrated in the processor or located outside the processor and exist independently.

In a tenth aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code, or instructions), which, when the computer program is executed, causes a computer to execute the first aspect or A method in any of the possible implementations of the second aspect and aspects thereof.

In an eleventh aspect, a computer-readable medium is provided, the computer-readable medium stores a computer program (also referred to as code, or instruction), when it is run on a computer, causing the computer to execute the above-mentioned first A method in any possible implementation of the aspect or the second aspect and aspects thereof.

Description of drawings

FIG. 1 is a schematic diagram of an example of an optical communication apparatus to which the frequency response estimation method and the spectrum measurement method of the present application are applied.

FIG. 2 is a schematic flowchart of an example of the frequency response estimation method of the present application.

FIG. 3 is a schematic diagram showing the influence of the frequency response of the transmitting unit and the frequency response of the receiving unit on the signal received by the receiving unit from the transmitting unit according to the present application.

FIG. 4 is a schematic flowchart of another example of the frequency response estimation method of the present application.

5 is a schematic diagram of an example of a processing system to which the frequency response estimation method and the spectrum measurement method of the present application are applied.

FIG. 6 is a schematic flowchart of still another example of the frequency response estimation method of the present application.

FIG. 7 is a schematic flowchart of an example of a method of spectral measurement of the present application.

FIG. 8 is a schematic flowchart of another example of the method for spectral measurement of the present application.

Detailed ways

The technical solutions in the present application will be described below with reference to the accompanying drawings.

The technical solutions of the present application can be applied to the fields of optical communication, optical switching, and the like. Exemplarily, the technical solution can be used in the estimation process of the frequency response of the optical transmitting unit and the optical receiving unit or the spectral measurement process of the signal transmitted by the optical transmitting unit in these neighborhoods.

FIG. 1 is a schematic diagram of an example of an optical communication device 100 of the present application. As shown in FIG. 1 , the optical communication device 100 includes a sending unit 110 , a receiving unit 120 and a processing unit 130 .

The sending unit 110 may also be referred to as a transmitting end or a transmitter. As an example and not a limitation, the sending unit 110 may include but not limited to a digital to analog converter (DAC, Digital to Analog Converter), a modulator, an electrical signal driver, a laser, etc. device.

The sending unit 110 is used to obtain a digital signal from a device or device that generates a digital signal (for example, a digital signal processor (Digital Signal Processing, DSP), etc.), and perform analog-to-digital conversion (for example, based on a DAC) on the digital signal Processing, amplification processing (based on electrical signal drivers), and modulation processing (based on modulators and lasers) to generate and transmit optical signals.

It should be noted that the digital signal input to the transmitting unit 110 has a prescribed amplitude at each frequency point in the frequency domain, and the digital signal is a symmetrical signal. Specifically, it is located on both sides of the reference frequency point in the frequency domain. And the amplitudes of the two frequency points that are equally spaced from the reference frequency point are the same. As an example and not a limitation, the reference frequency point may be a 0 frequency point.

In addition, in this application, the frequency of the laser of the sending unit 110 can be changed, or the frequency (or the center frequency) of the optical signal generated by the sending unit 110 can be changed, that is, the sending unit 110 can generate Optical signals with multiple center frequencies. Alternatively, the frequency of the laser of the sending unit 110 may be fixed, or the frequency (or the center frequency) of the optical signal generated by the sending unit 110 may be fixed, that is, the sending unit 110 may only generate An optical signal with a center frequency, which is not particularly limited in this application.

It should be understood that the devices and functions included in the sending unit 110 listed above are only exemplary descriptions, and the present application is not limited thereto, and the process of generating and sending the optical signal by the sending unit 110 may be similar to the prior art. Here, in order to Repeated descriptions are avoided, and detailed descriptions thereof are omitted.

The receiving unit 120 may also be referred to as a receiving end or a receiver. By way of example and not limitation, the receiving unit 120 may include, but is not limited to, a demodulator (or, in other words, a coherent receiver or a coherent demodulator), a local oscillator light source, a Impedance amplifier (Trans-Impedance Amplifier, TIA), Analog to Digital Converter (Analog to Digital Converter, ADC) and other devices.

The receiving unit 120 is configured to receive an optical signal, and perform, for example, demodulation processing (based on a coherent demodulator), amplification processing (based on TIA), and analog-to-digital conversion processing (based on ADC) on the optical signal. , to generate a digital signal and send the digital signal to a device or device, such as a DSP, for processing quantitative signals.

In addition, in this application, the frequency of the local oscillator light source of the receiving unit 120 can be changed, or the frequency (or the center frequency) of the local oscillator light generated by the receiving unit 120 can be changed, that is, the receiving unit 120 Able to generate local oscillator light of various center frequencies. Alternatively, the frequency of the local oscillator light source of the receiving unit 120 may be fixed, or the frequency (or center frequency) of the local oscillator light generated by the receiving unit 120 may be fixed, that is, the receiving unit 120 may The local oscillator light of only one center frequency to be generated is not particularly limited in the present application.

It should be understood that the devices and functions included in the receiving unit 120 listed above are only illustrative, and the present application is not limited thereto, and the process of acquiring the digital signal by the receiving unit 120 according to the optical signal may be similar to that in the prior art. Here, In order to avoid redundant description, the detailed description thereof is omitted.

It should be noted that when the above-mentioned apparatus 100 performs the frequency response estimation or spectrum measurement method of the present application, the sending unit 110 and the receiving unit 120 are connected in communication (for example, connected by optical fibers, etc.), that is, the receiving unit 120 can receive the The optical signal emitted from the transmitting unit 110 .

Moreover, in order to improve the accuracy of frequency response and spectrum measurement, it is preferable to connect the transmitting unit 110 and the receiving unit 120 directly, that is, the optical signal transmitted between the transmitting unit 110 and the receiving unit 120 is not forwarded by other devices.

The processing unit 130 is used for estimating the frequency response of the transmitting unit 110 according to the optical signal transmitted from the transmitting unit 110 and received by the receiving unit 120, or for measuring the spectrum of the optical signal.

As an example and not a limitation, the processing unit 130 includes, but is not limited to, a DSP.

The frequency response estimation method provided by the present application applicable to the optical communication device shown in FIG. 1 will be described in detail below.

In order to facilitate understanding and distinction, a case where the frequency response of the transmitting unit 110 in the frequency range of [0, f] needs to be estimated is taken as an example for description. In addition, as described above, since the digital signal is a symmetrical signal with the reference frequency point (for example, the 0 frequency point) as the symmetrical center, the frequency response of the transmitting unit 110 in the frequency range of [-f, 0] is the same as [0 , f] corresponds to the frequency response in the frequency range.

FIG. 2 shows a schematic flow of the frequency response estimation method 200 of the present application, wherein the method shown in FIG. 2 is applicable to the frequency of the local oscillator light source of the receiving unit 120 (or, in other words, the local oscillator light generated by the local oscillator light source). the center frequency) can be changed.

As shown in FIG. 2 , at S210, the sending unit 110 obtains a digital signal (denoted as signal #A for ease of understanding) from the DSP, wherein the signal #A is the base frequency signal, that is, the signal #A is the base frequency signal A point (eg, the 0 frequency point) is a symmetrical signal at the center of symmetry, and the bandwidth of this signal #A is [-f, f].

As an example and not a limitation, the amplitude of each frequency point of the signal #A may be the same, that is, the signal #A may be a signal with a rectangular spectrum, which is beneficial to the calculation of the frequency response. That is, the amplitudes of the frequency points of the signal #A are the same, and the phases of the frequency points of the signal #A are the same.

In addition, in order to determine the phase of each frequency point in the frequency response, the signal #A can be a multi-carrier signal.

And, the transmitting unit 110 performs processing on the signal #A, for example, the above-mentioned digital-to-analog conversion processing, amplification processing, modulation processing including up-conversion processing based on the above-mentioned laser, etc., to generate an optical signal (hereinafter, for ease of understanding, Note as signal #B). By way of example and not limitation, the center frequency of the signal #B is denoted as f ₀ .

That is, this information #B is affected by the frequency response of the transmission unit 110 .

The receiving unit 120 receives the signal #B from the transmitting unit 110 at S220.

At S230, the receiving unit 120 performs signal processing on the signal _#B based on the local oscillator signal whose center frequency is _f , signal #C). In addition, the receiving unit 120 beats (or down-converts) the signal #B based on the signal #C to obtain a signal with a center frequency of 0 (denoted as signal #D), and then performs a signal #D on the signal #D. Processes such as demodulation, amplification and analog-to-digital conversion are performed to obtain a digital signal (denoted as signal #E ₀ ).

Thereafter, the receiving unit 120 controls the local oscillator light source to generate a local oscillator signal with a center frequency of f ₁ (denoted as signal #F), and beats the signal #B according to the signal #F, and performs a Processes such as demodulation, amplification and analog-to-digital conversion to obtain a digital signal (denoted, signal #E ₁ ), this process is similar to the process in which the above-mentioned receiving unit 120 obtains signal #E ₀ based on signal #C, and is omitted here in order to avoid repeating details. its detailed description.

Similarly, the receiving unit 120 generates local oscillator signals of various center frequencies (eg, f ₂ ˜f _N ) through the local oscillator light source, and obtains a plurality of (N-2) local oscillator signals based on the plurality (N−2 pieces) of local oscillator signals. a) digital signal.

It should be noted that the transmitting unit 110 may transmit the signal #B multiple times (for example, N times), and the receiving unit 120 respectively performs the signal #B received each time based on the local oscillator signals of a plurality of (for example, N) center frequencies. beat frequency, and then obtain the above-mentioned multiple (N) digital signals.

Alternatively, the sending unit 110 may also send the signal #B once, in this case, the receiving unit 120 may save (or copy) the signal #B to obtain the above-mentioned multiple (N) digital signals.

At S240, the processing unit 130 acquires the N digital signals from the transmitting unit 110 (eg, an analog-to-digital converter of the transmitting unit).

At S250, the processing unit 130 determines, based on the signal parameters of the N digital signals, that the sending unit 110 (specifically, each component included in the sending unit 110) is at [0, f] (or, [-f, 0] ) frequency response in the range.

It should be noted that, in this application, a certain digital signal parameter may include the amplitude of multiple frequency points within the bandwidth of the digital signal, and/or the phase of multiple frequency points within the bandwidth of the digital signal.

Specifically, if the difference between f ₁ and the reference frequency point f ₀ (for ease of understanding, the frequency point f ₀ is taken as an example for description) is Δf, that is, f ₁ -f ₀ =Δf, the receiving unit 120 The digital signal output after the beat frequency based on the local oscillator signal whose center frequency is f ₁ will produce spectrum shift.

Therefore, the amplitude (or phase) of the -Δf frequency point of the signal input to the processing unit 130 after the signal #B is beat based on the local oscillator signal whose center frequency is f ₁ is f in the signal #B sent by the sending unit 110 The amplitude (or phase) of the ₀ frequency point is affected by the frequency response of the receiving unit 120 at -Δf, or, in other words, the signal #B is beat based on the local oscillator signal whose center frequency is f ₁ The amplitude (or phase) of the -Δf frequency point of the signal input to the processing unit 130 after frequency is the amplitude (or phase) of the signal #A at the 0 frequency point, which is affected by the frequency response of the transmitting unit 110 at the 0 frequency point and the receiving unit. 120 The magnitude (or phase) of the formation after the influence of the frequency response at -Δf.

Moreover, when the signal passes through the frequency response of the receiving unit, it is convolved in the time domain, multiplied in the frequency domain, and the amplitude-frequency and phase-frequency characteristics are added.

That is, let the amplitude (or phase) of the -Δf frequency point in the above-mentioned signal _# E1 (that is, the digital signal based on the beat frequency _of the local oscillator signal whose center frequency is f1) be H _TX+RX (-ΔfGHz), In addition, let the frequency response of the transmitting unit 110 at the zero frequency point (or in other words, the amplitude (or phase) of the zero frequency point in the frequency response of the transmitting unit 110 ) be H _TX (0 GHz), and let the receiving unit 110 be at the frequency of -Δf The frequency response of the point (or in other words, the amplitude (or phase) of the -Δf frequency point in the frequency response of the receiving unit 110) is H _RX (-Δf GHz), and the amplitude (or phase) of the signal #A itself is β, then The following formula 1 can be obtained:

H _TX+RX (-Δf GHz)=H _TX (0GHz)+H _RX (-ΔfGHz)+β Equation 1

As shown in FIG. 3 , when Δf=20 GHz, that is, in a digital signal obtained by beating the signal #B with the center frequency f ₀ based on the local oscillator signal with the center frequency f ₁ =f ₀ +20 GHz, The value of the amplitude (or phase) of the frequency point of -20GHz is equal to the amplitude (or phase) of the frequency point of 0GHz in the frequency response of the transmitting unit 110 and the amplitude (or phase) of the frequency point of -20GHz in the frequency response of the receiving unit 120 and the signal The sum of the magnitude (or phase) of #A itself.

Similarly, if the difference between f ₂ and f ₁ is Δf, that is, f ₂ -f ₁ =Δf, f ₂ -f ₀ =2Δf, then due to the above-mentioned spectrum shift, the frequency point Δf in signal #E ₁ (that is, The amplitude (or phase) of the f ₂ frequency point) is the amplitude (or phase) of the f ₀ +2Δf frequency point in the signal sent by the sending unit 110, which is determined by the frequency response of the receiving unit 120 at Δf (ie, the f ₁ frequency point) The magnitude (or phase) after the effect.

That is, let the amplitude (or phase) of the frequency point f2 in the signal _# E1 be H TX _{+ RX} (ΔfGHz), and let the amplitude (or phase) of the frequency point 2ΔfGHz in the frequency response of the transmitting unit 110 be H _TX ( 2ΔfGHz), set the amplitude (or phase) of the f ₁ frequency point in the frequency response of the receiving unit 110 to be H _RX (ΔfGHz), the following formula 2 can be obtained:

H _TX+RX (ΔfGHz)=H _TX (2ΔfGHz)+H _RX (ΔfGHz)+β Equation 2

As shown in FIG. 3 , when Δf=20 GHz, that is, in a digital signal obtained by beating the signal #B with the center frequency f ₀ based on the local oscillator signal with the center frequency f ₁ =f ₀ +20 GHz, The value of the amplitude (or phase) of the 20GHz frequency point is equal to the amplitude (or phase) of the 40GHz frequency point in the frequency response of the transmitting unit 110 and the amplitude (or phase) of the 20GHz frequency point in the frequency response of the receiving unit 120 and the signal #A itself. The sum of the magnitude (or phase) of .

Moreover, since the frequency response of the receiving unit 120 has symmetry with respect to the reference frequency point, the following formula 3 can be obtained:

H _RX (-ΔfGHz)=H _RX (ΔfGHz) Equation 3

Therefore, the following Equation 4 can be obtained based on the above-mentioned Equations 1 to 3:

H _TX+RX (ΔfGHz)-H _TX+RX (-ΔfGHz)=H _TX (2ΔfGHz)+H _RX (ΔfGHz)+β-(H _TX (0GHz)+H _RX (-ΔfGHz)+β)=H _TX (2ΔfGHz)-H _TX (0GHz) Equation 4

That is, as shown in Equation 4 above, in the frequency response of the transmitting unit 110, the difference between the amplitude (or phase) at the frequency of 2Δf and the amplitude (or phase) at the 0 frequency point (ie, an example of the reference frequency point) is based on The difference between the amplitude (or phase) at -Δf and the amplitude (or phase) at -Δf in the digital signal obtained after the local oscillator signal whose center frequency is Δf beats signal #B.

Moreover, since the amplitude (or phase) of the 0-frequency point in the frequency response of the transmitting unit 110 is 0, the amplitude at 2Δf in the frequency response of the transmitting unit 110 is: based on the local oscillator signal whose center frequency is f ₀ +Δf #B The difference between the amplitude at -Δf and the amplitude at -Δf in the digital signal obtained after performing the beat frequency.

In addition, in the present application, after the processing unit 130 obtains from the receiving unit 120 a digital signal obtained by beating the signal #B based on the local oscillator signal whose center frequency is f ₀ +Δf, the digital signal may be frequency-shifted. (The process of frequency shifting corresponds to the offset between the center frequency of the local oscillator signal and the center frequency of signal #B, for example, the magnitude of the frequency shift is -Δf), and based on the frequency shifted phase and signal #A The difference between the phases determines the phase at 2Δf in the frequency response of the transmitting unit 110 .

It should be understood that the above-mentioned methods for determining the phase in the frequency response are only exemplary, and the present application is not limited thereto. For example, the digital signal may be down-sampled before frequency shifting, and, The frequency offset compensation (to compensate the frequency offset of the laser or the local oscillator light source) and framing can also be performed on the frequency-shifted signal. In the following, in order to avoid redundant description, the description of the same or similar situations is omitted.

Similarly, the processing unit 130 can determine the frequency response of the sending unit 110 at the 2X frequency point according to the digital signal obtained after the beat frequency of the local oscillator signal whose center frequency is X.

That is, by using the above digital signals obtained based on the beat frequencies of N local oscillator signals (with different center frequencies), it is possible to determine N signals of the transmitting unit 110 within the range of [0, f] (or, [-f, 0]). The frequency response of the frequency points, and then the frequency response of the sending unit 110 can be estimated (or reconstructed) according to the frequency responses of the N frequency points (denoted as frequency response #A).

In an implementation manner, the frequency interval between two adjacent frequency points among the N frequency points may be the same, for example, the above Δf, so that the processing unit 130 may control the receiving unit 120 (or, in other words, the receiving unit The local oscillator light source) generates N local oscillator signals, and the center frequency difference between the N local oscillator signals and signal #B is Δf, 2Δf, 3Δf, . . . , NΔf, where NΔf=f/2.

Optionally, at S260, the processing unit 130 may also determine a frequency response #B according to the signal sent by the sending unit 110 and received by the receiving unit 120, where the frequency response #B includes the frequency response of the sending unit 110 and the receiving unit. 120 frequency response to both sides, for example, the transmitting unit 110 may generate the optical signal #Y based on the digital signal #X, the receiving unit 120 may receive the optical signal #Y, and process the optical signal #Y to generate the digital signal #Z, thereby , the processing unit 130 can determine the frequency response #B according to the amplitude difference (or phase difference) of the frequency points of the digital signal #Z and the digital signal #X. In addition, the process may also be similar to the prior art, which is not particularly limited in this application.

Further, at S270, the processing unit 130 may determine the frequency response of the receiving unit 120 based on the frequency response #B and the frequency response #A. For example, the amplitude (or phase) of the frequency response intermediate frequency point #a of the receiving unit 120 is equal to the difference between the amplitude (or phase) of the frequency response #B intermediate frequency point #a and the amplitude (or phase) of the frequency response #A intermediate frequency point #a .

FIG. 4 shows a schematic flow of the frequency response estimation method 300 of the present application, wherein the method shown in FIG. 4 is applicable to the frequency of the laser of the transmitting unit 110 (or, in other words, the center frequency of the beam generated by the laser) can be changed Case.

Different from the process shown in FIG. 2 , in the method 300, the transmitting unit 110 generates N optical signals with center frequencies f ₀ to f _N respectively, and the receiving unit 120 is based on the local oscillator of the same center frequency (for example, f ₀ ). The light beats the N optical signals respectively, and then determines the N digital signals.

Therefore, the frequency response of the transmitting unit 110 is determined according to the N digital signals, that is, the amplitude (or phase) at 2Δf in the frequency response of the transmitting unit 110 can be determined as: based on the local oscillator signal whose center frequency is f ₀ to the center frequency The difference between the amplitude (or phase) at -Δf and the amplitude (or phase) at the Δf frequency point in the digital signal obtained after the optical signal of f ₀ +Δf is beat frequency.

Other processes and principles are similar to the above-mentioned method 200 , and detailed descriptions thereof are omitted here in order to avoid redundant descriptions.

FIG. 5 is a schematic diagram of an example of a processing system 400 to which the frequency response estimation method of the present application is applied. As shown in FIG. 5 , the processing system 400 includes: a measuring device 410 and a device under test 420 .

The measuring device 410 includes a receiving unit 415 and a processing unit 417 .

The device under test 420 includes a sending unit 425 .

The structure and function of the transmitting unit 425 are similar to the above-mentioned transmitting unit 110, and the detailed description is omitted here in order to avoid redundant description, and the frequency of the laser of the transmitting unit 425 can be fixed, that is, the frequency of the optical signal transmitted by the transmitting unit 425 Frequency is fixed.

The structure and function of the receiving unit 415 are similar to the above-mentioned receiving unit 120, and here, in order to avoid repeating the description, the detailed description thereof is omitted, and the frequency of the local oscillator light source of the receiving unit 415 can be changed, that is, the center frequency of the local oscillator signal can be changed.

FIG. 6 shows a schematic flow of a method 500 for frequency response estimation applicable to the processing system 400 described above. Different from the process shown in FIG. 2 , in the method 500 , the receiving unit 415 of the measuring device 410 captures the optical signals received from the transmitting unit 425 of the device under test 420 based on N local oscillator lights with different center frequencies, respectively. frequency, and then N digital signals are obtained, so that the frequency response of the transmitting unit 110 is determined according to the N digital signals, that is, the amplitude (or phase) at 2Δf in the frequency response of the transmitting unit 110 can be determined as: based on the center frequency of The difference between the amplitude (or phase) at -Δf and the amplitude (or phase) at Δf in the digital signal obtained after the local oscillator signal of f ₀ +Δf beats the received optical signal with a center frequency of f ₀ value.

Other processes and principles are similar to the above-mentioned method 200 , and detailed descriptions thereof are omitted here in order to avoid redundant descriptions.

In a possible implementation manner, the device under test 420 may further include a receiving unit 427 and a processing unit 429 .

The structure and function of the receiving unit 427 are similar to the above-mentioned receiving unit 120. Here, in order to avoid redundant description, the detailed description is omitted, and the frequency of the local oscillator light source of the receiving unit 427 can be fixed, that is, the frequency of the local oscillator light of the receiving unit 427 is fixed. The center frequency is fixed.

Also, the measuring device 410 may further include a sending unit 419 .

In this case, the method 500 may further include the sending unit 419 generating N optical signals with different center frequencies and sending them to the receiving unit 427, so that the processing unit 429 can determine the receiving unit according to the N optical signals with different center frequencies 427, and this process is similar to the process of the method 300 shown in FIG. 4, and here, in order to avoid redundant description, the detailed description thereof is omitted.

FIG. 7 shows a schematic flow of the method 600 for spectral measurement of the present application, wherein the method shown in FIG. 7 is applicable to the frequency of the local oscillator light source of the receiving unit 120 (or in other words, the frequency of the local oscillator light generated by the local oscillator light source). center frequency) can be changed.

As shown in FIG. 7 , at S610, the sending unit 110 obtains a digital signal from the DSP (for ease of understanding, denoted as signal #1), wherein the signal #1 is a base frequency signal, that is, the signal #1 is a base frequency signal A point (eg, the 0 frequency point) is a symmetrical signal at the center of symmetry, and the bandwidth of this signal #1 is [-f, f].

In this application, the signal #1 may be a multi-carrier signal, which is not particularly limited in this application.

And, the transmitting unit 110 performs processing on the signal #1, for example, the above-mentioned digital-to-analog conversion processing, amplification processing, modulation processing including up-conversion processing based on the above-mentioned laser, etc., to generate an optical signal (hereinafter, for ease of understanding, Note as signal #2). By way of example and not limitation, let the center frequency of this signal #2 be f ₀ .

The receiving unit 120 receives the signal #2 from the transmitting unit 110 at S620.

In S630, the receiving unit 120 performs signal processing on the signal # ₂ based on the local oscillator signal whose center frequency is _f , signal #3). In addition, the receiving unit 120 beats (or down-converts) the signal #2 based on the signal #3, so as to obtain an optical signal with a center frequency of 0 (referred to as signal #4), and then the signal #4 Processes such as demodulation, amplification, and analog-to-digital conversion are performed to obtain a digital signal corresponding to the f ₀ frequency point (denoted as signal #5 ₀ ).

Thereafter, the receiving unit 120 controls the local oscillator light source to generate a local oscillator signal with a center frequency of f ₁ (denoted as signal #6), and obtains a digital signal corresponding to the frequency point of f ₁ (denoted as signal #6) according to the signal #6. 5 ₁ ), the process is similar to the process in which the receiving unit 120 obtains the signal #5 ₀ based on the signal #3, and the detailed description is omitted here in order to avoid redundant description.

Similarly, the receiving unit 120 generates local oscillator signals of various center frequencies (eg, f ₂ ˜f _N ) through the local oscillator light source, and obtains a plurality of (N-2) local oscillator signals based on the plurality (N−2 pieces) of local oscillator signals. a) digital signal.

It should be noted that, the transmitting unit 110 may transmit the signal #2 multiple times (for example, N times), and the receiving unit 120 respectively performs the signal #2 received each time based on the local oscillator signals of a plurality of (for example, N) center frequencies. beat frequency, and then obtain the above-mentioned multiple (N) digital signals.

Alternatively, the transmitting unit 110 may also transmit the signal #2 once. In this case, the receiving unit 120 may save (or copy) the signal #2, and further obtain the above-mentioned multiple (N) digital signals.

At S640, the processing unit 130 acquires the N digital signals from the transmitting unit 110 (eg, an analog-to-digital converter of the transmitting unit).

At S650, the processing unit 130 determines the spectrum of the signal #2 based on the signal parameters of the N digital signals.

Specifically, if the difference between f ₁ and the reference frequency point f ₀ (for ease of understanding, the frequency point f ₀ is taken as an example for description) is Δf, that is, f ₁ -f ₀ =Δf, the receiving unit 120 The digital signal output after the beat frequency based on the local oscillator signal whose center frequency is f ₁ will produce spectrum shift.

Therefore, after the signal # ₂ is beat based on the local oscillator signal whose center frequency is f1, the amplitude of the -Δf frequency point of the signal input to the processing unit 130 is the amplitude of the frequency point _f0 in the signal #2 sent by the sending unit 110. The amplitude is affected by the frequency response of the receiving unit 120 at -Δf, or, in other words, the -Δf of the signal input to the processing unit 130 after the signal # ₂ is beat based on the local oscillator signal with the center frequency f1 The amplitude of the frequency point is the amplitude formed after the amplitude of the signal #1 at the 0 frequency point is influenced by the frequency response of the transmitting unit 110 at the 0 frequency point and the frequency response of the receiving unit 120 at -Δf.

Moreover, when the signal passes through the frequency response of the receiving unit, it is convolved in the time domain, multiplied in the frequency domain, and the amplitude-frequency and phase-frequency characteristics are added.

That is, let the amplitude of the -Δf frequency point in the above-mentioned signal #5 ₁ (that is, the digital signal output based on the beat frequency of the local oscillator signal whose center frequency is f ₁ ) be H _TX+RX (-ΔfGHz), and let the transmission The frequency response of the unit 110 at the 0-frequency point (or, in other words, the amplitude of the 0-frequency point in the frequency response of the transmitting unit 110) is H _TX (0 GHz). The amplitude of -Δf frequency point in the frequency response of the receiving unit 110) is H _RX (-Δf GHz), and the amplitude of the signal #1 itself is β, the following formula 1 can be obtained:

H _TX+RX (-Δf GHz)=H _TX (0GHz)+H _RX (-ΔfGHz)+β Equation 1

Similarly, if the difference between f ₂ and f ₁ is Δf, that is, f ₂ -f ₁ =Δf, f ₂ -f ₀ =2Δf, then due to the above-mentioned spectrum shift, the frequency point Δf in signal # ₅₁ (that is, The amplitude of the f ₂ frequency point) is the amplitude of the f ₀ +2Δf frequency point in the signal sent by the transmitting unit 110 after being affected by the frequency response of the receiving unit 120 at Δf (ie, the f ₁ frequency point).

That is, let the amplitude of the f2 frequency in the signal # ₅₁ be H _TX+RX (ΔfGHz), and let the amplitude of the _2ΔfGHz frequency in the frequency response of the transmitting unit 110 be H _TX (2ΔfGHz), and let the receiving unit 110 The amplitude of the f ₁ frequency point in the frequency response is H _RX (ΔfGHz), then the following formula 2 can be obtained:

H _TX+RX (ΔfGHz)=H _TX (2ΔfGHz)+H _RX (ΔfGHz)+β Equation 2

Moreover, since the frequency response of the receiving unit 120 has symmetry with respect to the reference frequency point, the following formula 3 can be obtained:

H _RX (-ΔfGHz)=H _RX (ΔfGHz) Equation 3

Therefore, the following Equation 4 can be obtained based on the above-mentioned Equations 1 to 3:

H _TX+RX (ΔfGHz)-H _TX+RX (-ΔfGHz)=H _TX (2ΔfGHz)+H _RX (ΔfGHz)+β-(H _TX (0GHz)+H _RX (-ΔfGHz)+β)=H _TX (2ΔfGHz)-H _TX (0GHz) Equation 4

That is, as shown in Equation 4 above, in the frequency response of the transmitting unit 110, the difference between the amplitude at the frequency of 2Δf and the amplitude at the 0 frequency point (ie, an example of the reference frequency point) is based on the local oscillator signal whose center frequency is Δf The difference between the amplitude at -Δf and the amplitude at -Δf in the digital signal obtained after beating signal #2.

Moreover, since the amplitude (or phase) of the zero frequency point in the frequency response of the transmitting unit 110 is 0, the amplitude at 2Δf in the signal transmitted by the transmitting unit 110 is: based on the pair of local oscillator signals whose center frequency is f ₀ +Δf The difference between the amplitude at -Δf and the amplitude at -Δf in the digital signal obtained after signal #2 is beat.

Similarly, the processing unit 130 can determine the amplitude at the 2X frequency point in the optical signal #2 according to the digital signal obtained based on the beat frequency of the local oscillator signal whose center frequency is X.

That is, by using the above digital signals obtained based on the beat frequencies of N local oscillator signals (with different center frequencies), N of the optical signal #2 in the range of [0, f] (or, [-f, 0]) can be determined. The amplitudes of the N frequency points, and then the spectrum of the optical signal #2 can be estimated (or reconstructed) according to the amplitudes of the N frequency points.

In an implementation manner, the frequency interval between two adjacent frequency points among the N frequency points may be the same, for example, the above Δf, so that the processing unit 130 may control the receiving unit 120 (or, in other words, the receiving unit The local oscillator light source) generates N local oscillator signals, and the center frequency difference between the N local oscillator signals and signal #B is Δf, 2Δf, 3Δf, and the ellipsis NΔf, where NΔf=f/2.

FIG. 8 shows a schematic flow of a method 700 for spectrum measurement applicable to the processing system 400 described above. Different from the process shown in FIG. 7 , in the method 700 , the receiving unit 415 of the measuring device 410 captures the optical signals received from the transmitting unit 425 of the device under test 420 based on N local oscillator lights with different center frequencies, respectively. Then, N digital signals are obtained, so that the spectrum of the optical signal sent by the sending unit 110 is determined according to the N digital signals, that is, the amplitude (or phase) at 2Δf in the frequency response of the sending unit 110 can be determined as: The difference between the amplitude at 2Δf and the amplitude at the 0 frequency point in the digital signal obtained after the local oscillator signal with the center frequency Δf beats the received optical signal.

Other processes and principles are similar to the above-mentioned method 600 , and detailed descriptions thereof are omitted here in order to avoid redundant descriptions.

In this application, the above-mentioned processing unit 130 may be a processing device. The functions of the processing device may be implemented by hardware, or may be implemented by hardware executing corresponding software. For example, the processing device may comprise at least one processor and at least one memory, wherein the at least one memory is used to store a computer program, the at least one processor reads and executes the computer program stored in the at least one memory such that The processing unit 130 performs the operations and/or processing performed by the processing unit in each method embodiment.

Optionally, the above-mentioned processing unit 130 may only include a processor, and the memory for storing the computer program is located outside the processing device. The processor is connected to the memory through circuits/wires to read and execute the computer program stored in the memory.

In some examples, the above-mentioned processing unit 130 may also be a chip or an integrated circuit. For example, a processing device includes a processing circuit/logic circuit and an interface circuit for receiving and transmitting signals and/or data to the processing circuit, which processes the signals and/or data and/or data to implement various functions of the processing unit in each method embodiment.

In one implementation, the processing unit 130 includes one or more processors, one or more memories, and one or more communication interfaces. The processor is used to control the communication interface to send and receive information, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the processing unit 130 executes the processing performed by the above-mentioned processing unit 130 in each method embodiment of the present application and/or operations.

Optionally, the memory and the processor in the foregoing apparatus embodiments may be physically independent units, or the memory may also be integrated with the processor, which is not limited herein.

In addition, the present application further provides a computer-readable storage medium, where computer instructions are stored in the computer-readable storage medium, and when the computer instructions are executed on the computer, the computer executes each method embodiment of the present application and is executed by a control device operations and/or processes.

In addition, the present application also provides a computer program product, the computer program product includes computer program codes or instructions, when the computer program codes or instructions are run on a computer, the operations performed by the control device in each method embodiment of the present application and/or or the process is executed.

In addition, the present application also provides a chip, the chip includes a processor, a memory for storing a computer program is provided independently of the chip, and the processor is used for executing the computer program stored in the memory, so that the controller installed with the chip is Perform the operations and/or processes performed by the controller in any of the method embodiments.

Further, the chip may further include a communication interface. The communication interface may be an input/output interface or an interface circuit or the like. Further, the chip may further include the memory.

In addition, the present application also provides a communication device (for example, can be a chip), comprising a processor and a communication interface, the communication interface is used for receiving a signal and transmitting the signal to the processor, and the processor processes The signal is such that the operations and/or processing performed by the processing unit 130 in any one of the method embodiments are performed.

The processor in this embodiment of the present application may be an integrated circuit chip, which has the capability of processing signals. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable Logic devices, discrete gate or transistor logic devices, discrete hardware components. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the methods disclosed in the embodiments of the present application may be directly embodied as executed by a hardware coding processor, or executed by a combination of hardware and software modules in the coding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

The memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (erasable PROM, EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of illustration and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) ) and direct memory bus random access memory (direct rambus RAM, DRRAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative, and the division of the units is only a division of logical functions, and other division methods may be used in actual implementation. For example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The unit described as a separate component may or may not be physically separated, and the component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units, Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application.

The above are only specific embodiments of the present application. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (26)

1. A method for frequency response estimation, characterized in that it is performed in a communication device configured with a receiving unit, the method comprising:

   Obtain N first optical signals, the N first optical signals correspond to N frequency points in the target frequency range one-to-one, N is an integer greater than or equal to 2, and the first optical signals are based on transmitted and determined by the optical signal received by the receiving unit;

   A first frequency response is determined according to the signal parameters of the N first optical signals, where the first frequency response includes a frequency response of the transmitting unit within the target frequency range, wherein the first frequency response is The first response value corresponding to the first frequency point is determined according to a signal parameter of the first optical signal corresponding to the second frequency point, and the signal parameter includes at least one of amplitude or phase.
2. The method according to claim 1, wherein the frequency value of the first frequency point is twice the frequency value of the second frequency point.
3. The method according to claim 1 or 2, wherein the method further comprises:

   receiving, by the receiving unit, a second optical signal sent by the sending unit, where the bandwidth of the second optical signal corresponds to the target frequency range;

   determining a second frequency response according to the signal parameter of the second optical signal, where the second frequency response includes the frequency response of the transmitting unit within the target frequency range and the frequency response of the receiving unit within the target frequency range;

   According to the first frequency response and the second frequency response, a third frequency response is determined, and the third frequency response includes a frequency response of the receiving unit within the target frequency range.
4. The method according to any one of claims 1 to 3, wherein the acquiring N first optical signals comprises:

   receiving, by the receiving unit, a third optical signal sent by the sending unit, where the bandwidth of the third optical signal corresponds to the target frequency range;

   The first optical signals are beat frequency based on the N first local oscillator signals, respectively, to obtain the N first optical signals, and the center frequencies of the N first local oscillator signals are the same as the N frequencies. A correspondence.
5. The method according to any one of claims 1 to 3, wherein the acquiring N first optical signals comprises:

   receiving, by the receiving unit, the N fourth optical signals sent by the transmitting unit, where the center frequencies of the N fourth optical signals correspond to the N frequencies one-to-one;

   The N fourth optical signals are beat frequency respectively based on the second local oscillator signal, so as to obtain the N first optical signals.
6. The method according to any one of claims 1 to 5, wherein the determining the first frequency response according to the signal parameters of the N first optical signals comprises:

   The first response value is determined according to a first parameter value in the signal parameters of the first optical signal corresponding to the second frequency point, where the first parameter value is a parameter value corresponding to the first frequency point.
7. The method according to claim 6, wherein the determining the first response value according to the first parameter value in the signal parameters of the first optical signal corresponding to the second frequency point comprises:

   determining, according to the first parameter value, a first difference between the first response value and a second response value, where the second response value is a response value corresponding to a reference frequency point;

   The first response value is determined according to the first difference value and the second response value.
8. The method according to claim 7, wherein the reference frequency point is a 0 frequency point.
9. The method according to any one of claims 1 to 8, wherein the frequency interval between two adjacent frequency points in the N frequency points is the same.
10. The method according to any one of claims 1 to 9, wherein the communication device further comprises the sending unit.
11. A device for frequency response estimation, characterized in that the device comprises:

    a receiving unit, configured to acquire N first optical signals, where the N first optical signals correspond one-to-one with N frequency points within the target frequency range, where N is an integer greater than or equal to 2, and the first optical signals is determined based on the optical signal transmitted by the transmitting unit and received by the receiving unit;

    a processing unit, configured to determine a first frequency response according to signal parameters of the N first optical signals, where the first frequency response includes a frequency response of the sending unit within the target frequency range, wherein the The first response value corresponding to the first frequency point in the first frequency response is determined according to the signal parameter of the second optical signal corresponding to the second frequency point, and the signal parameter includes at least one of amplitude or phase, and the first A frequency point is any frequency point among the N frequency points.
12. The device according to claim 11, wherein the frequency value of the first frequency point is twice the frequency value of the second frequency point.
13. The device according to claim 11 or 12, wherein the receiving unit is further configured to receive a second optical signal sent by the sending unit, and the bandwidth of the second optical signal corresponds to the target frequency range ;

    The processing unit is further configured to determine a second frequency response according to the signal parameter of the second optical signal, where the second frequency response includes the frequency response of the transmitting unit in the target frequency range and the receiving unit in the target frequency range. a frequency response within a frequency range, and determining a third frequency response according to the first frequency response and the second frequency response, where the third frequency response includes the frequency response of the receiving unit within the target frequency range .
14. The device according to any one of claims 11 to 13, wherein the receiving unit is specifically configured to receive a third optical signal sent by the sending unit, and the bandwidth of the third optical signal is the same as the bandwidth of the third optical signal. The target frequency range corresponds, and the first optical signals are beat frequency based on the N first local oscillator signals respectively, so as to obtain the N first optical signals, the center frequencies of the N first local oscillator signals are the same as The N frequencies are in one-to-one correspondence.
15. The device according to any one of claims 11 to 13, wherein the receiving unit is specifically configured to receive N fourth optical signals sent by the sending unit, and the N fourth optical signals are The center frequency is in one-to-one correspondence with the N frequencies, and the N fourth optical signals are beat frequency based on the second local oscillator signal to obtain the N first optical signals.
16. The apparatus according to any one of claims 11 to 15, wherein the processing unit is specifically configured to determine, according to a first parameter value in a signal parameter of the first optical signal corresponding to the second frequency point, For the first response value, the first parameter value is a parameter value corresponding to the first frequency point.
17. The apparatus according to claim 16, wherein the processing unit is specifically configured to determine, according to the first parameter value, a first difference between the first response value and the second response value, and the The second response value is the response value corresponding to the reference frequency point, and the first response value is determined according to the first difference value and the second response value.
18. The device according to claim 17, wherein the reference frequency is a zero frequency.
19. The apparatus according to any one of claims 11 to 18, wherein the frequency interval between two adjacent frequency points in the N frequency points is the same.
20. The device according to any one of claims 11 to 19, wherein the communication device further comprises the sending unit.
21. A method for spectral measurement, characterized in that it is performed in a communication device configured with a receiving unit, the method comprising:

    Obtain N first optical signals, the N first optical signals correspond to N frequency points in the target frequency range one-to-one, N is an integer greater than or equal to 2, and the first optical signals are based on transmitted and determined by the optical signal received by the receiving unit;

    Determine a first spectrum according to the amplitudes of the N first optical signals, where the first spectrum includes the spectrum of the optical signal sent by the sending unit in the target frequency range, wherein the first spectrum in the first spectrum The first amplitude corresponding to one frequency point is determined according to the amplitude of the first optical signal corresponding to the second frequency point.
22. A device for spectral measurement, comprising:

    a receiving unit, configured to acquire N first optical signals, where the N first optical signals correspond one-to-one with N frequency points within the target frequency range, where N is an integer greater than or equal to 2, and the first optical signals is determined based on the optical signal transmitted by the transmitting unit and received by the receiving unit;

    a processing unit, configured to determine a first spectrum according to the amplitudes of the N first optical signals, where the first spectrum includes a spectrum of the optical signal sent by the sending unit in the target frequency range, wherein the The first amplitude corresponding to the first frequency point in the first spectrum is determined according to the amplitude of the first optical signal corresponding to the second frequency point.
23. An optical signal processing device, characterized by comprising a processor, wherein the processor is coupled with a memory, the memory is used for storing computer programs or instructions, and the processor is used for executing the computer programs or instructions in the memory, The method as claimed in any one of claims 1 to 8, 21 is caused to be performed.
24. The device according to claim 23, wherein the optical signal processing device is a chip.
25. A computer-readable storage medium, characterized in that a computer program or instruction is stored, and the computer program or instruction is used to implement the method according to any one of claims 1 to 8 and 21 .
26. A computer program product comprising a computer program which, when executed, causes a computer to perform the method of any one of claims 1 to 8, 21.

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