CN114499657B

CN114499657B - Method and apparatus for frequency response estimation

Info

Publication number: CN114499657B
Application number: CN202011143281.8A
Authority: CN
Inventors: 李志沛; 余毅
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2024-03-26
Anticipated expiration: 2040-10-23
Also published as: WO2022083254A1; CN114499657A

Abstract

The application provides a method and a device for estimating frequency response, a method and a device for spectrum measurement and an optical communication device, wherein the method for estimating frequency response is executed in a communication device provided with a receiving unit and comprises the following steps: acquiring N first optical signals, wherein the N first optical signals are in one-to-one correspondence with N frequency points in a target frequency range, N is an integer greater than or equal to 2, and the first optical signals are determined based on the optical signals sent by a sending unit and received by a receiving unit; and determining a first frequency response according to the signal parameters of the N first optical signals, wherein the first frequency response comprises frequency response of the sending unit in the target frequency range, a first response value corresponding to a first frequency point in the first frequency response is determined according to the signal parameters of the first optical signals corresponding to a second frequency point, and the signal parameters comprise at least one of amplitude and phase. Thus, the measuring cost can be reduced without using additional measuring equipment.

Description

Method and apparatus for frequency response estimation

Technical Field

Embodiments of the present application relate to the field of communications, and more particularly, to a method and apparatus for estimating frequency response of a receiving unit and a transmitting unit in an optical communication system, and a method and apparatus for spectrum measurement of an optical signal transmitted by the transmitting unit.

Background

In the transmission or reception of 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 (e.g., amount of phase change and/or amount of amplitude change) between the input signal and the output signal at different frequencies is also different for each cell, i.e., the amount of change between the input signal and the output signal varies with frequency, and the variation relationship of such amount of change with frequency is referred to as frequency response.

For optical transceivers, the frequency response of the optical module is a very important parameter. Particularly, when high-bandwidth high-speed signal transmission is performed, frequency responses of a transmitting unit and a receiving unit need to be estimated (or measured) respectively, and then compensation is performed at the transmitting unit and the receiving unit respectively, so that the transmission performance of the system is improved.

In the prior art, an optical signal transmitted by a transmitting unit may be received by a receiving unit of an optical module, and then a frequency response of the optical signal may be detected, so that the frequency response includes frequency responses (denoted as frequency response a) of both the receiving unit and the transmitting unit, and then a noise signal may be generated by an additional measuring device, and the noise signal may be received by the receiving unit, and then the frequency response (denoted as frequency response b) of the receiving unit may be determined. On the one hand, this prior art needs to be implemented by a measuring device capable of generating noise signals, increasing the cost and condition constraints of the frequency response estimation. On the other hand, since the measurement apparatus itself also has a frequency response, the frequency response of the transmission unit cannot be accurately obtained based on the frequency response a and the frequency response b obtained as described above.

Accordingly, it is desirable to provide a technique capable of accurately and reliably determining the frequency response of a transmitting unit and reducing the measurement cost.

Disclosure of Invention

The application provides a frequency response estimation method and device and optical communication equipment, which can accurately and reliably determine the frequency response of a sending unit and reduce the measurement cost.

In a first aspect, a method of frequency response estimation is provided, performed in a communication device configured with a receiving unit, the method comprising: acquiring N first optical signals, wherein the N first optical signals are in one-to-one correspondence with N frequency points in a target frequency range, N is an integer greater than or equal to 2, and the first optical signals are determined based on the optical signals sent by a sending unit and received by a receiving unit; and determining a first frequency response according to the signal parameters of the N first optical signals, wherein the first frequency response comprises frequency response of the sending unit in the target frequency range, a first response value corresponding to a first frequency point in the first frequency response is determined according to the signal parameters of the first optical signals corresponding to a second frequency point, and the signal parameters comprise at least one of amplitude and phase.

According to the scheme provided by the application, when the frequency response of the sending unit in the target frequency range is required to be estimated, the first optical signals with the center frequencies respectively corresponding to the plurality of frequency points in the target frequency range are respectively obtained, the frequency response of the sending unit in the target frequency range can be determined according to the plurality of first optical signals, and the measuring equipment is not required to be additionally used, so that the measuring cost can be reduced.

In the present application, the "signal parameter of the first optical signal" may also be understood as a signal parameter of a digital signal of a fundamental frequency generated by subjecting the first optical signal to demodulation, down-conversion (or, beat frequency), amplification, analog-to-digital conversion, and the like.

Wherein the first frequency point is any frequency point in the N frequency points.

By way of example and not limitation, the frequency value of the first frequency point is 2 times the frequency value of the second frequency point.

In one implementation, the determining the first frequency response according to the signal parameters of the N first optical signals includes: and determining the first response value according to a first parameter value in signal parameters of the first optical signal corresponding to the second frequency point, wherein the first parameter value is the parameter value corresponding to the first frequency point.

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

In one implementation, the reference frequency point includes a 0 frequency point.

By way of example and not limitation, the frequency spacing between two adjacent ones of the N frequency bins is the same.

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

In one implementation, the method further comprises: receiving, by the receiving unit, a second optical signal transmitted by the transmitting unit, a bandwidth of the second optical signal corresponding to the target frequency range; determining a second frequency response according to the signal parameters of the second optical signal, wherein the second frequency response comprises the frequency response of the sending unit in a target frequency range and the frequency response of the receiving unit in the target frequency range; a third frequency response is determined from the first frequency response and the second frequency response, the third frequency response comprising a frequency response of the receiving unit within the target frequency range.

Thus, the frequency response of the receiving unit can be determined, further improving the utility of the present application.

In one implementation, the acquiring the N first optical signals includes: receiving, by the receiving unit, a third optical signal transmitted by the transmitting unit, a bandwidth of the third optical signal corresponding to the target frequency range; and respectively beating the first optical signals based on the N first local oscillator signals to obtain N first optical signals, wherein the center frequencies of the N first local oscillator signals are in one-to-one correspondence with the N frequencies.

Therefore, the method and the device can be applied to the situation that the transmission frequency of the transmission unit is fixed, and further improve the compatibility and the practicability of the application.

In another implementation, the acquiring the N first optical signals includes: receiving, by the receiving unit, the N fourth optical signals transmitted by the transmitting unit, where center frequencies of the N fourth optical signals are in one-to-one correspondence with the N frequencies; and respectively beating the N fourth optical signals based on the second local oscillation signals to obtain N first optical signals.

Therefore, the method and the device can be suitable for the condition of fixed frequency of the local oscillation signal of the receiving unit, and further improve the compatibility and practicality of the application.

By way of example and not limitation, the communication device further comprises the transmitting unit.

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

According to the scheme provided by the application, when the spectrum of the optical signal in the target frequency range of the sending unit is required to be measured, the first optical signals with the center frequencies corresponding to the plurality of frequency points in the target frequency range can be obtained respectively, the spectrum of the optical signal corresponding to the target frequency range sent by the sending unit can be determined according to the plurality of first optical signals, and the measuring equipment is not required to be additionally used, so that the measuring cost can be reduced.

In one implementation, the determining the first spectrum according to the magnitudes of the N first optical signals includes: and determining the first amplitude according to a first value in the first optical signal corresponding to the second frequency point, wherein 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, the determining, by the root, the first amplitude according to a first value in the first optical signal corresponding to the second frequency point includes: determining a first difference value between the first amplitude and a second amplitude according to the first value, wherein the second amplitude is the amplitude corresponding to the 0 frequency point; the first amplitude is determined from the first difference and the second amplitude.

In a third aspect, an apparatus for frequency response estimation is provided, the apparatus comprising: a receiving unit, configured to obtain N first optical signals, where the N first optical signals are in one-to-one correspondence with N frequency points in a target frequency range, N is an integer greater than or equal to 2, and the first optical signals are determined based on the optical signals sent by the sending unit and received by the receiving unit; and the processing unit is used for determining a first frequency response according to the signal parameters of the N first optical signals, wherein the first frequency response comprises a frequency response of the transmitting unit in the target frequency range, a first response value corresponding to a first frequency point in the first frequency response is determined according to the signal parameters of a second optical signal corresponding to a second frequency point, and the signal parameters comprise at least one of amplitude and phase.

As an example and not by way of limitation, the receiving unit is further configured to receive a second optical signal transmitted by the transmitting unit, the bandwidth of the second optical signal corresponding 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 a frequency response of the transmitting unit in a target frequency range and a frequency response of the receiving unit in the target frequency range, and determine a third frequency response according to the first frequency response and the second frequency response, where the third frequency response includes a frequency response of the receiving unit in the target frequency range.

In one implementation manner, the receiving unit is specifically configured to receive a third optical signal sent by the sending unit, where a bandwidth of the third optical signal corresponds to the target frequency range, and beat frequencies of the first optical signals based on N first local oscillator signals respectively, so as to obtain the N first optical signals, and center frequencies of the N first local oscillator signals are in one-to-one correspondence with the N frequencies.

In another implementation manner, the receiving unit is specifically configured to receive N fourth optical signals sent by the sending unit, where center frequencies of the N fourth optical signals are in one-to-one correspondence with the N frequencies, and beat frequencies of the N fourth optical signals based on second local oscillator signals, so as 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 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.

And 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 value corresponding to a reference frequency point, and determine, according to the first difference and the second response value, the first response value.

By way of example and not limitation, the reference frequency bin includes a 0 frequency bin

In a possible implementation, the communication device further comprises the sending unit.

In a fourth aspect, there is provided an apparatus for spectral measurement, the apparatus comprising: a receiving unit, configured to obtain N first optical signals, where the N first optical signals are in one-to-one correspondence with N frequency points in a target frequency range, N is an integer greater than or equal to 2, and the first optical signals are determined based on the optical signals sent by the sending unit and received by the receiving unit; and the processing unit is used for determining a first spectrum according to the amplitudes of the N first optical signals, wherein the first spectrum comprises a spectrum of the optical signal corresponding to the target frequency range sent by the sending unit, and the first amplitude corresponding to the first frequency point in the first spectrum is determined according to the amplitudes of the first optical signals corresponding to the second frequency point.

For example, the frequency value of the first frequency point is 2 times the frequency value of the second frequency point

In one 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, where the first value is a value of the amplitude corresponding to the first frequency point in the first optical signal corresponding to the second 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 amplitude is determined from the first difference and the second amplitude.

In one implementation manner, the receiving unit is specifically configured to receive a third optical signal sent by the sending unit, where a bandwidth of the third optical signal corresponds to the target frequency range; and respectively beating the first optical signals based on the N first local oscillator signals to obtain N first optical signals, wherein the center frequencies of the N first local oscillator signals are in one-to-one correspondence with the N frequencies.

In another implementation manner, the receiving unit is specifically configured to receive N fourth optical signals sent by the sending unit, where center frequencies of the N fourth optical signals are in one-to-one correspondence with the N frequencies; and respectively beating the N fourth optical signals based on the second local oscillation signals to obtain N first optical signals.

In a fifth aspect, there is provided an optical signal processing device comprising individual modules or units for performing the method of any one of the first or second aspects and any one of its possible implementations.

A sixth aspect provides an optical communications device comprising the apparatus of any one of the third or fourth aspects and any one of its possible implementations.

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

In one implementation, the processing device is a processing apparatus. 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-on-chip. In this case, the communication interface may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin, a related circuit, or the like on the chip or the chip system. The processor may also be embodied as processing circuitry or logic circuitry.

An eighth aspect provides a processing apparatus, comprising: input circuit, output circuit and processing circuit. The processing circuitry is to receive signals via the input circuitry and to transmit signals via the output circuitry such that the method of the first or second aspect and any one of its possible implementations is implemented.

In a specific implementation process, the 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 trigger, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the output signal may be output to and transmitted by, for example and without limitation, a transmitter, and the input circuit and the output circuit may be different circuits or the same circuit, in which case the circuits function as the input circuit and the output circuit, respectively, at different times. The embodiments of the present application do not limit the specific implementation manner of the processor and the various circuits.

In a ninth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory and is configured to receive signals via the receiver and to transmit signals via the transmitter to perform the method of the first or second aspect and various possible implementations thereof.

Optionally, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

In a specific implementation, the memory may be a non-transient (non-transitory) memory, for example, a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips.

It should be appreciated that the related data interaction process, for example, transmitting the indication information, may be a process of outputting the indication information from the processor, and the receiving the capability information may be a process of receiving the input capability information by the processor. Specifically, the data output by the processing may be output to the transmitter, and the input data received by the processor may be from the receiver. Wherein the transmitter and receiver may be collectively referred to as a transceiver.

The processor in the ninth aspect may be a chip, and the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor, implemented by reading software code stored in a memory, which may be integrated in the processor, or may reside outside the processor, and exist separately.

In a tenth aspect, there is provided a computer program product comprising: a computer program (which may also be referred to as code, or instructions) which, when executed, causes a computer to perform the method of the first or second aspect and any one of the possible implementations of its aspects.

In an eleventh aspect, there is provided a computer readable medium storing a computer program (which may also be referred to as code, or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first or second aspect and aspects thereof described above.

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 flow chart of an example of a method of frequency response estimation of the present application.

Fig. 3 shows a schematic diagram of the frequency response of a transmitting unit and the influence of the frequency response of a receiving unit on the signal received by the receiving unit from the transmitting unit of the present application.

Fig. 4 is a schematic flow chart of another example of a method of frequency response estimation of the present application.

Fig. 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 flow chart of still another example of a method of frequency response estimation of the present application.

Fig. 7 is a schematic flow chart of an example of a method of spectral measurement of the present application.

Fig. 8 is a schematic flow chart of another example of a method of spectral measurement of the present application.

Detailed Description

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

The technical scheme of the application can be applied to the fields of optical communication, optical exchange, and the like. The present solution may be used for example in the estimation process of the frequency response of the optical transmitting unit and the optical receiving unit for these neighborhoods or in the spectral measurement process of the signals transmitted by the optical transmitting unit.

Fig. 1 is a schematic diagram of an example of an optical communication apparatus 100 of the present application, and as shown in fig. 1, the optical communication apparatus 100 includes a transmitting unit 110, a receiving unit 120, and a processing unit 130.

The transmitting unit 110 may also be referred to as a transmitting end or transmitter, and by way of example and not limitation, the transmitting unit 110 may include, but is not limited to, digital-to-analog converters (DACs, digital to Analog Converter), modulators, electrical signal drivers, lasers, and the like.

The transmission unit 110 is configured to acquire a digital signal from a device or apparatus that generates a digital signal (e.g., a digital signal processor (Digital Signal Processing, DSP), etc.), and perform processing such as analog-to-digital conversion processing (performed based on a DAC), amplification processing (performed based on an electric signal driver), modulation processing (performed based on a modulator and a laser), etc., on the digital signal to generate and transmit an optical signal.

Note that, each frequency point of the digital signal input to the transmitting unit 110 has a predetermined amplitude in the frequency domain, and the digital signal is a symmetrical signal, specifically, two frequency points located on both sides of a reference frequency point in the frequency domain and equally spaced from the reference frequency point have the same amplitude, and the reference frequency point may be a 0 frequency point by way of example and not limitation.

In the present application, the frequency of the laser of the transmitting unit 110 may be changed, or the frequency (or center frequency) of the optical signal generated by the transmitting unit 110 may be changed, that is, the optical signals of various center frequencies that the transmitting unit 110 can generate. Alternatively, the frequency of the laser of the transmitting unit 110 may be fixed, or, in other words, the frequency (or, center frequency) of the optical signal generated by the transmitting unit 110 may be fixed, that is, the transmitting unit 110 may generate only one center frequency optical signal, which is not particularly limited herein.

It should be understood that the above-listed devices and functions included in the transmitting unit 110 are only exemplary descriptions, and the present application is not limited thereto, and the process of generating and transmitting the optical signal by the transmitting unit 110 may be similar to the related art, and here, detailed descriptions thereof are omitted for the sake of avoiding redundancy.

The receiving unit 120 may also be referred to as a receiving end or receiver, and by way of example and not limitation, the receiving unit 120 may include, but is not limited to, a demodulator (or, alternatively, a coherent receiver or a coherent demodulator), a local oscillator light source, a transimpedance amplifier (Trans-Impedance Amplifier, TIA), an analog-to-digital converter (Analog to Digital Converter, ADC), and the like.

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

In this application, the frequency of the local oscillation light source of the receiving unit 120 may be changed, or the frequency (or center frequency) of the local oscillation light generated by the receiving unit 120 may be changed, that is, the local oscillation light of various center frequencies that the receiving unit 120 can generate. Alternatively, the frequency of the local oscillation light source of the receiving unit 120 may be fixed, or, in other words, the frequency (or center frequency) of the local oscillation light generated by the receiving unit 120 may be fixed, that is, only the local oscillation light of one center frequency may be generated by the receiving unit 120, which is not particularly limited in this application.

It should be understood that the above-listed devices and functions included in the receiving unit 120 are only exemplary descriptions, 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 the prior art, and detailed descriptions thereof are omitted herein for the sake of avoiding redundancy.

When the method of frequency response estimation or spectrum measurement of the present application is performed by the above-described apparatus 100, the transmitting unit 110 and the receiving unit 120 are connected in communication (for example, connected by an optical fiber or the like), that is, the receiving unit 120 can receive the optical signal transmitted from the transmitting unit 110.

In order to improve the accuracy of the frequency response and the spectrum measurement, it is preferable that the transmitting unit 110 and the receiving unit 120 are directly connected, that is, the optical signal transmitted between the transmitting unit 110 and the receiving unit 120 is not forwarded via other devices.

The processing unit 130 is used for estimating the frequency response of the transmitting unit 110 from 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.

By way of example, and not limitation, the processing unit 130 includes a DSP.

The method of frequency response estimation provided herein, which is applicable to the optical communication apparatus shown in fig. 1, is described in detail below.

For ease of understanding and distinction, the case where it is necessary to estimate the frequency response of the transmitting unit 110 in the frequency range of [0, f ] will be described as an example. In addition, since the digital signal is a symmetric signal with the reference frequency point (e.g., 0 frequency point) as the center of symmetry as described above, the frequency response of the transmission unit 110 in the frequency range of [ -f,0] corresponds to the frequency response in the frequency range of [0, f ].

Fig. 2 shows a schematic flow of a method 200 for estimating a frequency response of the present application, where the method shown in fig. 2 is applicable to a case where the frequency of the local oscillation light source (or, the center frequency of the local oscillation light generated by the local oscillation light source) of the receiving unit 120 can be changed.

As shown in fig. 2, at S210, the transmitting unit 110 acquires a digital signal (for ease of understanding, denoted as a signal #a) from the DSP, wherein the signal #a is a fundamental frequency signal, that is, the signal #a is a symmetrical signal having a reference frequency point (for example, 0 frequency point) as a symmetry center, and the bandwidth of the signal #a is [ -f, f ].

By way of example and not limitation, the amplitudes of the frequency bins of the signal #a may be the same, i.e., the signal #a may be a signal having a rectangular frequency spectrum, thereby facilitating the calculation of the frequency response. That is, the amplitude of each frequency point of the signal #a is the same, and the phase of each frequency point of the signal #a is the same.

In order to determine the phase of each frequency point in the frequency response, the signal #a may be a multicarrier signal.

The transmitting unit 110 processes the signal #a, for example, the digital-to-analog conversion process, the amplification process, the modulation process including the up-conversion process performed by the laser, and the like, to generate an optical signal (hereinafter, referred to as a signal #b for ease of understanding). By way of example and not limitation, the center frequency of the signal #b is denoted as f ₀ 。

That is, the information #b is affected by the frequency response of the transmitting unit 110.

In S220, the receiving unit 120 receives the signal #b from the transmitting unit 110.

In S230, receiving section 120 performs a center frequency f-based processing on signal #b ₀ Specifically, the receiving unit 120 controls the local oscillation light source to generate the local oscillation signal with the center frequency f ₀ Is referred to as a local oscillator signal (signal #c). The receiving unit 120 then beats (or down-converts) the signal #b based on the signal #c to obtain a signal (denoted as a signal #d) having a center frequency of 0, and then demodulates, amplifies, analog-to-digital converts, and the like the signal #d to obtain a digital signal (denoted as a signal #e ₀ )。

Thereafter, the receiving unit 120 controls the local oscillator light source to generate a center frequency f ₁ And beat the signal #b based on the signal #f, and demodulate, amplify, analog-to-digital convert the obtained signal to obtain a digital signal (signal #e ₁ ) The process and the receiving unit 120 acquire the signal #E based on the signal #C ₀ Is similar to the procedure of (c), and a detailed description thereof is omitted herein for the sake of avoiding redundancy.

Similarly, the receiving unit 120 generates a plurality of center frequencies (e.g., f ₂ ～f _N ) And acquiring a plurality of (N-2) digital signals based on the plurality of (N-2) local oscillation signals.

Note that, the transmitting unit 110 may transmit the signal #b a plurality of times (for example, N times), and the receiving unit 120 may beat the signal #b received each time based on a plurality of (for example, N) local oscillation signals of the center frequency, thereby obtaining the plurality of (N) digital signals.

Alternatively, transmitting section 110 may transmit signal #b once, and in this case, receiving section 120 may store (or copy) signal #b to obtain the plurality of (N) digital signals.

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

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

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

Specifically, let f ₁ And the reference frequency point f ₀ (for ease of understanding, at f ₀ For 0 frequency bin as an example) is Δf, i.e., f ₁ -f ₀ =Δf, then the receiving unit 120 is based on the center frequency of f ₁ The digital signal output after the beat frequency of the local oscillation signal can generate frequency spectrum shift.

Thus, at a center frequency f ₁ The amplitude (or phase) of the- Δf frequency point of the signal inputted to the processing unit 130 after the beat frequency of the signal #b is f in the signal #b transmitted by the transmitting unit 110 ₀ The amplitude (or phase) of the frequency bin is affected by the frequency response of the receiving unit 120 at- Δf, or, in other words, based on the center frequency, f ₁ The amplitude (or phase) of the- Δf frequency point of the signal inputted to the processing unit 130 after the beat frequency of the signal #b is the amplitude (or phase) formed after the amplitude (or phase) of the signal #a at the 0 frequency point is affected 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.

The signal is convolved in the time domain and multiplied in the frequency domain in response to the frequency of the receiving unit, and the amplitude-frequency and phase-frequency characteristics are added.

That is, the signal #E is set ₁ (i.e., based on the center frequency f ₁ Digital signal output after beat frequency of local oscillation signal) is H _TX+RX (- ΔfGHz), and let the frequency response of the transmitting unit 110 at 0 frequency point (or, in other words, the amplitude (or phase) of 0 frequency point in the frequency response of the transmitting unit 110) be H _TX (0 GHz), the frequency response of the receiving unit 110 at the frequency point of- Δf is set (orIn other words, the amplitude (or phase)) of the- Δf frequency point in the frequency response of the receiving unit 110 is H _RX (- ΔfGHz), and assuming the amplitude (or phase) of the signal #A itself is β, the following equation 1 can be derived:

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

As shown in fig. 3, at Δf=20 GHz, i.e., at f based on the center frequency ₁ ＝f ₀ The local oscillation signal pair center frequency of +20GHz is f ₀ In the digital signal obtained by beating the signal #b of (a), the value of the amplitude (or phase) of the-20 GHz frequency bin is equal to the sum of the amplitude (or phase) of the-20 GHz frequency bin in the frequency response of the transmitting unit 110 and the amplitude (or phase) of the-20 GHz frequency bin in the frequency response of the receiving unit 120 and the amplitude (or phase) of the signal #a itself.

Similarly, let f ₂ And f ₁ Is Δf, i.e. f ₂ -f ₁ ＝Δf，f ₂ -f ₀ =2Δf, the signal #e is due to the spectrum shifting ₁ Middle Δf frequency point (i.e., f ₂ Frequency point) is f in the signal transmitted by the transmitting unit 110 ₀ The amplitude (or phase) of the +2Δf frequency bin is determined by the receiving unit 120 at Δf (i.e., f ₁ Frequency point) of the frequency response.

That is, the signal #E is set ₁ Middle f ₂ The amplitude (or phase) of the frequency point is H _TX+RX (ΔfGHz), and the amplitude (or phase) of the 2ΔfGHz frequency point in the frequency response of the transmitting unit 110 is set to H _TX (2ΔfGHz), let f be the frequency response of the receiving unit 110 ₁ The amplitude (or phase) of the frequency point is H _RX (ΔfGHz), the following equation 2 can be obtained:

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

As shown in fig. 3, at Δf=20 GHz, i.e., at f based on the center frequency ₁ ＝f ₀ The local oscillation signal pair center frequency of +20GHz is f ₀ In the digital signal obtained by beating the signal #B of (1), the amplitude (or phase) of the 20GHz frequency point is equal to the transmitting unit 110The sum of the amplitude (or phase) of the 40GHz bin in the frequency response of the receiving unit 120 and the amplitude (or phase) of the 20GHz bin in the frequency response of the signal #a itself.

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

H _RX (-ΔfGHz)＝H _RX (ΔfGHz) 3

Therefore, the following expression 4 can be obtained based on the above expressions 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 (0 GHz) 4

That is, as shown in the above equation 4, the difference between the amplitude (or phase) at the frequency 2Δf and the amplitude (or phase) at the 0 frequency point (i.e., one example of the reference frequency point) in the frequency response of the transmitting unit 110 is the difference between the amplitude (or phase) at- Δf and the amplitude (or phase) at- Δf in the digital signal obtained by beating the signal #b based on the local oscillation signal having the center frequency Δf.

Also, since the amplitude (or phase) of the 0 frequency bin in the frequency response of the transmission unit 110 is 0, the amplitude at 2Δf in the frequency response of the transmission unit 110 is: based on a center frequency f ₀ The local oscillation signal of +Deltaf beats the signal #B to obtain the difference between the amplitude at-Deltaf and the amplitude at-Deltaf in the digital signal.

In addition, in the present application, the processing unit 130 obtains the center frequency f from the receiving unit 120 ₀ After the local oscillation signal of +Δf beats the signal #b, the digital signal may be frequency shifted (where the frequency shifting process corresponds to a shift between the center frequency of the local oscillation signal and the center frequency of the signal #b, for example, the frequency shifting is- Δf), and the phase at 2Δf in the frequency response of the transmitting unit 110 is determined based on the difference between the phase after the frequency shifting and the phase of the signal #a.

It should be understood that the above-listed determination of the phase in the frequency response is merely illustrative, and the present application is not limited thereto, and for example, the digital signal may be downsampled before being shifted, and the signal after being shifted may be subjected to frequency offset compensation (to compensate for the frequency offset of the laser or the local oscillator light source), framing, and the like. Hereinafter, in order to avoid redundancy, the description of the same or similar cases will be omitted.

Similarly, the processing unit 130 can determine the frequency response of the transmitting unit 110 at the 2X frequency point from the digital signal obtained after the beat frequency based on the local oscillation signal with the center frequency X.

That is, the digital signal obtained by beating based on the N (different center frequencies) local oscillation signals can determine the frequency responses of the N frequency points in the range of [0, f ] (or, [ -f,0 ]) of the transmitting unit 110, and further can estimate (or reconstruct) the frequency response (denoted as the frequency response #a) of the transmitting unit 110 based on the frequency responses of the N frequency points.

In one implementation, the frequency interval between two adjacent frequency points in the N frequency points may be the same, for example, Δf, so that the processing unit 130 may control the receiving unit 120 (or the local oscillator light source of the receiving unit) to generate N local oscillator signals, where the central frequencies of the N local oscillator signals and the signal #b are respectively Δf, 2Δf, 3Δf, … …, and nΔf, where nΔf=f/2.

Optionally, at S260, the processing unit 130 may further determine a frequency response #b according to the signal transmitted by the transmitting unit 110 and received by the receiving unit 120, the frequency response #b including both the frequency response of the transmitting unit 110 and the frequency response of the receiving unit 120, for example, the transmitting unit 110 may generate an 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, so that the processing unit 130 may determine the frequency response #b according to an amplitude difference (or a phase difference) of the digital signal #z and the frequency points of the digital signal #x. In addition, the process may be similar to the prior art, and the present application is not particularly limited.

Further, at S270, the processing unit 130 may determine a 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 of the receiving unit 120 at the frequency point #a is equal to the difference between the amplitude (or phase) of the frequency response #b at the frequency point #a and the amplitude (or phase) of the frequency response #a at the frequency point #a.

Fig. 4 shows a schematic flow of a method 300 of frequency response estimation of the present application, wherein the method shown in fig. 4 is applicable in a case where 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.

Unlike the procedure shown in fig. 2, in the method 300, the transmitting unit 110 generates the center frequencies f, respectively ₀ ～f _N Is based on the same center frequency (e.g., f ₀ ) And (3) respectively beating the N optical signals by local oscillation light, so as to further determine N digital signals.

Thus, determining the frequency response of the transmitting unit 110 from the N digital signals, i.e. the amplitude (or phase) at 2Δf in the frequency response of the transmitting unit 110, may be determined as: based on a center frequency f ₀ Is f to the center frequency of the local oscillation signal ₀ The difference between the amplitude (or phase) at- Δf and the amplitude (or phase) of Δf frequency point in the digital signal obtained after the optical signal of +Δf is subjected to beat frequency.

Other processes and principles are similar to those of the method 200 described above, and detailed descriptions thereof are omitted for the sake of brevity.

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

Wherein the measuring device 410 comprises a receiving unit 415 and a processing unit 417.

The device under test 420 includes a transmitting unit 425.

Here, the structure and function of the transmitting unit 425 are similar to those of the transmitting unit 110 described above, and detailed description thereof is omitted for the sake of avoiding redundancy, and the frequency of the laser of the transmitting unit 425 may be fixed, that is, the frequency of the optical signal transmitted by the transmitting unit 425 may be fixed.

The structure and function of the receiving unit 415 are similar to those of the receiving unit 120 described above, and detailed description thereof is omitted for the sake of brevity, and the frequency of the local oscillation light source of the receiving unit 415 may be changed, that is, the center frequency of the local oscillation signal may be changed.

Fig. 6 shows a schematic flow of a method 500 of frequency response estimation suitable for use in the processing system 400 described above. Unlike the procedure shown in fig. 2, in the method 500, the optical signals received from the transmitting unit 425 of the device under test 420 are respectively beaten by the receiving unit 415 of the measuring device 410 based on N local oscillation lights having different center frequencies, and 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 may be determined as: based on a center frequency f ₀ The center frequency of the local oscillation signal pair received by the +Deltaf is f ₀ The difference between the amplitude (or phase) at- Δf and the amplitude (or phase) at Δf in the digital signal obtained after the beat frequency is performed.

In one possible implementation, device under test 420 may also include a receiving unit 427 and a processing unit 429.

The structure and function of the receiving unit 427 are similar to those of the receiving unit 120 described above, and detailed description thereof is omitted here for the sake of avoiding redundancy, and the frequency of the local oscillation light source of the receiving unit 427 may be fixed, that is, the center frequency of the local oscillation light of the receiving unit 427 is fixed.

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

In this case, the method 500 may further include the transmitting unit 419 generating N optical signals with different center frequencies and transmitting the N optical signals to the receiving unit 427, so that the processing unit 429 can determine the frequency response of the receiving unit 427 according to the N optical signals with different center frequencies, and the process is similar to that of the method 300 shown in fig. 4, and detailed descriptions thereof are omitted for avoiding redundancy.

Fig. 7 shows a schematic flow of a method 600 for spectrum measurement according to the present application, where the method shown in fig. 7 is applicable to a case where the frequency of the local oscillation light source (or, the center frequency of the local oscillation light generated by the local oscillation light source) of the receiving unit 120 can be changed.

As shown in fig. 7, in S610, the transmitting unit 110 acquires a digital signal (for ease of understanding, denoted as signal # 1) from the DSP, wherein the signal #1 is a baseband signal, that is, the signal #1 is a symmetric signal having a reference frequency point (for example, 0 frequency point) as a center of symmetry, and the bandwidth of the signal #1 is [ -f, f ].

In the present application, the signal #1 may be a multicarrier signal, and the present application is not particularly limited.

The transmission unit 110 processes the signal #1, for example, the digital-to-analog conversion process, the amplification process, the modulation process including the up-conversion process performed by the laser, and the like, to generate an optical signal (hereinafter, the signal #2 is referred to for ease of understanding). By way of example and not limitation, the center frequency of this signal #2 is denoted f ₀ 。

In S620, the receiving unit 120 receives the signal #2 from the transmitting unit 110.

In S630, the receiving unit 120 performs a center frequency f-based processing on the signal #2 ₀ Specifically, the receiving unit 120 controls the local oscillation light source to generate the local oscillation signal with the center frequency f ₀ Is referred to as signal # 3. Then, receiving section 120 obtains an optical signal (denoted as signal # 4) having a center frequency of 0 by beating (or down-converting) signal #2 based on signal #3, and then demodulates, amplifies, analog-to-digital converts, and the like signal #4 to obtain f ₀ Digital signal corresponding to frequency point (denoted as signal #5 ₀ )。

Thereafter, the receiving unit 120 controls the local oscillator light source to generate a center frequency f ₁ Is recorded as signal # 6) and obtains f based on the signal #6 ₁ Digital signal corresponding to frequency point (denoted as signal #5 ₁ ) The process and the receiving unit 120 acquire the signal #5 based on the signal #3 ₀ Is similar to the process ofHere, detailed description thereof is omitted for the sake of avoiding redundancy.

Note that, the transmitting unit 110 may transmit the signal #2 multiple times (for example, N times), and the receiving unit 120 may beat the signal #2 received each time based on local oscillation signals of multiple (for example, N) center frequencies, thereby obtaining the multiple (N) digital signals.

Alternatively, transmitting section 110 may transmit signal #2 once, and in this case, receiving section 120 may store (or copy) signal #2 to obtain the plurality of (N) digital signals.

At S640, the processing unit 130 acquires the N digital signals from the transmitting unit 110 (e.g., 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.

Thus, at a center frequency f ₁ The amplitude of the- Δf frequency point of the signal input to the processing unit 130 after the beat frequency of the signal #2 is f in the signal #2 transmitted by the transmitting unit 110 ₀ The amplitude of the frequency bin is affected by the frequency response of the receiving unit 120 at- Δf, or based on the center frequency, f ₁ The amplitude of the- Δf frequency point of the signal inputted to the processing unit 130 after the beat frequency of the signal #2 is the amplitude formed by the influence of the frequency response of the signal #1 at the 0 frequency point by the transmitting unit 110 and the influence of the frequency response of the receiving unit 120 at the- Δf.

That is, the signal #5 is set ₁ (i.e., based on the center frequency f ₁ Digital signal output after beat frequency of local oscillation signal) is H _TX+RX (- ΔfGHz), and the frequency response of the transmitting unit 110 at 0 frequency point (or the amplitude of 0 frequency point in the frequency response of the transmitting unit 110) is set to H _TX (0 GHz), let the frequency response of the receiving unit 110 at the frequency point of- Δf (or the amplitude of the frequency point of- Δf in the frequency response of the receiving unit 110) be H _RX (- ΔfGHz), and assuming the amplitude of the signal #1 itself is β, the following equation 1 can be derived:

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

Similarly, let f ₂ And f ₁ Is Δf, i.e. f ₂ -f ₁ ＝Δf，f ₂ -f ₀ =2Δf, signal #5 due to the spectrum shift ₁ Middle Δf frequency point (i.e., f ₂ Frequency point) is f in the signal transmitted by the transmitting unit 110 ₀ The amplitude of the +2Δf frequency bin is determined by the receiving unit 120 at Δf (i.e., f ₁ Frequency point) of the frequency response.

That is, signal #5 is set ₁ Middle f ₂ The amplitude of the frequency point is H _TX+RX (ΔfGHz), and the amplitude of the 2ΔfGHz frequency point in the frequency response of the transmitting unit 110 is set to H _TX (2ΔfGHz), let f be the frequency response of the receiving unit 110 ₁ The amplitude of the frequency point is H _RX (ΔfGHz), the following equation 2 can be obtained:

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

H _RX (-ΔfGHz)＝H _RX (ΔfGHz) 3

That is, as shown in the above equation 4, the difference between the amplitude at the frequency 2Δf and the amplitude at the 0 frequency point (i.e., one example of the reference frequency point) in the frequency response of the transmitting unit 110 is the difference between the amplitude at- Δf and the amplitude at- Δf in the digital signal obtained by beating the signal #2 based on the local oscillation signal having the center frequency Δf.

Also, since the amplitude (or phase) of the 0 frequency point in the frequency response of the transmission unit 110 is 0, the amplitude at 2Δf in the transmitted signal of the transmission unit 110 is: based on a center frequency f ₀ The local oscillation signal of +Δf beats the signal #2 to obtain the difference between the amplitude at- Δf and the amplitude at- Δf in the digital signal.

Similarly, the processing unit 130 can determine the amplitude at the 2X frequency point in the optical signal #2 from the digital signal obtained after the beat frequency based on the local oscillation signal with the center frequency X.

That is, the digital signal obtained after the beat frequency based on the N (center frequency difference) local oscillation signals can determine the amplitudes of the N frequency points of the optical signal #2 within the [0, f ] (or, [ -f,0 ]) range, and further the spectrum of the optical signal #2 can be estimated (or, reconstructed) from the amplitudes of the N frequency points.

In one implementation, the frequency interval between two adjacent frequency points in the N frequency points may be the same, for example, Δf, so that the processing unit 130 may control the receiving unit 120 (or the local oscillator light source of the receiving unit) to generate N local oscillator signals, where the central frequencies of the N local oscillator signals and the signal #b are respectively Δf, 2Δf, 3Δf, and ellipses nΔf, where nΔf=f/2.

Fig. 8 shows a schematic flow of a method 700 of spectrum measurement suitable for use in the processing system 400 described above. Unlike the procedure shown in fig. 7, in the method 700, the optical signals received from the transmitting unit 425 of the device under test 420 are respectively beat-frequency-shifted by the receiving unit 415 of the measuring device 410 based on N local oscillation lights having different center frequencies, and N digital signals are obtained, so that the spectrum of the optical signal transmitted by 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 may be determined as: and based on the local oscillation signal with the center frequency delta f, the difference value between the amplitude at the 2 delta f position and the amplitude of the 0 frequency point in the digital signal obtained after the received optical signal is subjected to beat frequency.

Other processes and principles are similar to those of the method 600 described above, and detailed descriptions thereof are omitted for the sake of brevity.

In this application, the processing unit 130 may be a processing device. The functions of the processing device may be implemented by hardware, or may be implemented by executing corresponding software by hardware. For example, the processing device may include at least one processor and at least one memory, where the at least one memory is configured to store a computer program, and the at least one processor reads and executes the computer program stored in the at least one memory, so that the processing unit 130 performs operations and/or processes performed by the processing unit in the method embodiments.

Alternatively, the processing unit 130 may include only a processor, and a memory for storing a computer program is located outside the processing device. The processor is connected to the memory through circuitry/wiring to read and execute the computer program stored in the memory.

In some examples, the processing unit 130 may also be a chip or an integrated circuit. For example, the processing device includes a processing circuit/logic circuit and an interface circuit, where the interface circuit is configured to receive signals and/or data and transmit the signals and/or data to the processing circuit, and the processing circuit processes the signals and/or data to implement functions of the processing unit in each method embodiment.

In one implementation, processing unit 130 includes: one or more processors, one or more memories, and one or more communication interfaces. The processor is configured to control the communication interface to send and receive information, the memory is configured to store a computer program, and the processor is configured to call and run the computer program from the memory, so that the processing unit 130 performs the processes and/or operations performed by the processing unit 130 in the embodiments of the method of the present application.

In the embodiments of the apparatus, the memory and the processor may be physically separate units, or the memory may be integrated with the processor, which is not limited herein.

Furthermore, the present application also provides a computer-readable storage medium having stored therein computer instructions, which when executed on a computer, cause the computer to perform the operations and/or flows performed by the control device in the method embodiments of the present application.

Furthermore, the present application also provides a computer program product comprising computer program code or instructions which, when run on a computer, cause operations and/or flows performed by the control device in the method embodiments of the present application to be performed.

Furthermore, the present application also provides a chip including a processor, where a memory for storing a computer program is provided separately from the chip, and the processor is configured to execute the computer program stored in the memory, so that a controller on which the chip is installed performs operations and/or processes performed by the controller in any one of the method embodiments.

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

The present application further provides a communication device (e.g., may be a chip) including a processor and a communication interface for receiving signals and transmitting the signals to the processor, the processor processing the signals such that operations and/or processing performed by the processing unit 130 in any of the method embodiments are performed.

The processor in the embodiments of the present application may be an integrated circuit chip with the capability of processing signals. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (digital signal processor, DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in the embodiments of the present application may be directly implemented as a hardware encoding processor executing, or may be implemented by a combination of hardware and software modules in the encoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

The memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DRRAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and the division of the units is merely a division of one logic function, and other divisions may be implemented in practice. For example, multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate components may or may not be physically separate, and components displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units, and part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.

The foregoing is merely specific embodiments of the present application, and any person skilled in the art may easily conceive of changes or substitutions within the technical scope of the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of frequency response estimation, performed in a communication device configured with a receiving unit, the method comprising:

acquiring N first optical signals, wherein the N first optical signals are in one-to-one correspondence with N frequency points in a target frequency range, N is an integer greater than or equal to 2, and the first optical signals are determined based on the optical signals sent by a sending unit and received by a receiving unit;

and determining a first frequency response according to the signal parameters of the N first optical signals, wherein the first frequency response comprises frequency response of the sending unit in the target frequency range, a first response value corresponding to a first frequency point in the first frequency response is determined according to the signal parameters of the first optical signals corresponding to a second frequency point, and the signal parameters comprise at least one of amplitude and phase.

2. The method of claim 1, wherein the frequency value of the first frequency bin is 2 times the frequency value of the second frequency bin.

3. The method according to claim 1, wherein the method further comprises:

receiving, by the receiving unit, a second optical signal transmitted by the transmitting unit, a bandwidth of the second optical signal corresponding to the target frequency range;

determining a second frequency response according to the signal parameters of the second optical signal, wherein the second frequency response comprises the frequency response of the sending unit in a target frequency range and the frequency response of the receiving unit in the target frequency range;

a third frequency response is determined from the first frequency response and the second frequency response, the third frequency response comprising a frequency response of the receiving unit within the target frequency range.

4. A method according to any one of claims 1 to 3, wherein said acquiring N first optical signals comprises:

receiving, by the receiving unit, a third optical signal transmitted by the transmitting unit, a bandwidth of the third optical signal corresponding to the target frequency range;

And respectively beating the first optical signals based on the N first local oscillator signals to obtain N first optical signals, wherein the center frequencies of the N first local oscillator signals are in one-to-one correspondence with the N frequencies.

5. A method according to any one of claims 1 to 3, wherein said acquiring N first optical signals comprises:

receiving, by the receiving unit, the N fourth optical signals transmitted by the transmitting unit, where center frequencies of the N fourth optical signals are in one-to-one correspondence with the N frequencies;

and respectively beating the N fourth optical signals based on the second local oscillation signals to obtain N first optical signals.

6. A method according to any one of claims 1 to 3, wherein said determining a first frequency response from signal parameters of said N first optical signals comprises:

and determining the first response value according to a first parameter value in signal parameters of the first optical signal corresponding to the second frequency point, wherein the first parameter value is the parameter value corresponding to the first frequency point.

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

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

and determining the first response value according to the first difference value and the second response value.

8. The method of claim 7, wherein the reference frequency point is a 0 frequency point.

9. A method according to any one of claims 1 to 3, wherein the frequency spacing between two adjacent ones of the N frequency bins is the same.

10. A method according to any one of claims 1 to 3, characterized in that the communication device further comprises the transmitting unit.

11. An apparatus for frequency response estimation, the apparatus comprising:

a receiving unit, configured to obtain N first optical signals, where the N first optical signals are in one-to-one correspondence with N frequency points in a target frequency range, N is an integer greater than or equal to 2, and the first optical signals are determined based on the optical signals sent by the sending unit and received by the receiving unit;

the processing unit is 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 transmitting unit in the target frequency range, a first response value corresponding to a first frequency point in the first frequency response is determined according to signal parameters of a second optical signal corresponding to a second frequency point, the signal parameters include at least one of amplitude and phase, and the first frequency point is any frequency point of the N frequency points.

12. The apparatus of claim 11, wherein the frequency value of the first frequency bin is 2 times the frequency value of the second frequency bin.

13. The apparatus of claim 11, wherein the receiving unit is further configured to receive a second optical signal transmitted by the transmitting unit, the bandwidth of the second optical signal corresponding 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 a frequency response of the transmitting unit in a target frequency range and a frequency response of the receiving unit in the target frequency range, and determine a third frequency response according to the first frequency response and the second frequency response, where the third frequency response includes a frequency response of the receiving unit in the target frequency range.

14. The apparatus 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, where a bandwidth of the third optical signal corresponds to the target frequency range, and beat frequencies of the first optical signals based on N first local oscillator signals respectively, so as to obtain the N first optical signals, where center frequencies of the N first local oscillator signals are in one-to-one correspondence with the N frequencies.

15. The apparatus 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, where center frequencies of the N fourth optical signals are in one-to-one correspondence with the N frequencies, and beat frequencies of the N fourth optical signals respectively based on a second local oscillator signal, so as to obtain the N first optical signals.

16. The apparatus according to any one of claims 11 to 13, wherein the processing unit is specifically configured to determine the first response value according to a first parameter value in signal parameters of a first optical signal corresponding to the second frequency point, where 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 a first difference between the first response value and a second response value according to the first parameter value, the second response value being a response value corresponding to a reference frequency point, and determine the first response value according to the first difference and the second response value.

18. The apparatus of claim 17, wherein the reference frequency point is a 0 frequency point.

19. The apparatus according to any one of claims 11 to 13, wherein a frequency interval between two adjacent ones of the N frequency bins is the same.

20. The apparatus according to any one of claims 11 to 13, further comprising the transmitting unit.

21. A method of spectral measurement, performed in a communication device configured with a receiving unit, the method comprising:

and determining a first spectrum according to the amplitudes of the N first optical signals, wherein the first spectrum comprises a spectrum of the optical signals sent by the sending unit in the target frequency range, and the first amplitude corresponding to the first frequency point in the first spectrum is determined according to the amplitudes of the first optical signals corresponding to the second frequency point.

22. An apparatus for spectral measurement, comprising:

And the processing unit is used for determining a first spectrum according to the amplitudes of the N first optical signals, wherein the first spectrum comprises a spectrum of the optical signals sent by the sending unit in the target frequency range, and the first amplitude corresponding to the first frequency point in the first spectrum is determined according to the amplitudes of the first optical signals corresponding to the second frequency point.

23. An optical signal processing device comprising a processor coupled to a memory for storing a computer program or instructions, the processor for executing the computer program or instructions in memory such that the method of any one of claims 1 to 8, 21 is performed.

24. The apparatus of claim 23, wherein the optical signal processing device is a chip.

25. A computer readable storage medium, characterized in that a computer program or instructions for implementing the method of any one of claims 1 to 8, 21 is stored.