Wavelength meter and wavelength measuring method

Abstract

The invention provides a wavelength meter and a wavelength measurement method, and the wavelength meter comprises the components of an optical splitter which is used for acquiring input light and dividing the input light into a plurality of optical signals according to a preset proportion; the signal channel group is used for respectively performing signal detection on the plurality of optical signals to obtain a plurality of wavelength related parameters for the input light; and the data processing module is used for obtaining the wavelength of the input light based on the plurality of wavelength related parameters for the input light. The wavelength meter is small in size and low in cost, and can accurately measure the wavelength of the light source.

Description

Technical Field

[0001] The present application relates to the technical field of wavelength measurement, and in particular to a low-cost wavelength meter and a wavelength measurement method. Background Art

[0002] An optical wavelength meter is an instrument used to measure the wavelength of a narrow linewidth light source (such as a laser beam). Current wavelength meters are generally bulky and expensive. Therefore, how to reduce the size and cost of a wavelength meter while achieving accurate wavelength measurement has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The present application provides a wavelength meter and a wavelength measurement method to at least solve the above technical problems existing in the prior art.

[0004] According to a first aspect of the present application, a wavelength meter is provided, the wavelength meter comprising:

[0005] An optical splitter, used to obtain input light and divide the input light into multiple optical signals according to a preset ratio;

[0006] A signal channel group, used to perform signal detection on a plurality of optical signals respectively, and obtain a plurality of wavelength-related parameters for the input light;

[0007] The data processing module is used to obtain the wavelength of the input light based on a plurality of wavelength-related parameters of the input light.

[0008] In one possible implementation, the signal channel group includes a first signal channel, a second signal channel, a third signal channel and a fourth signal channel;

[0009] The first signal channel includes a first detector, which is used to detect a first optical signal among the multiple optical signals to obtain a first wavelength-related parameter for the input light;

[0010] The second signal channel includes a linear filter and a second detector, which are used to detect a second optical signal among the multiple optical signals to obtain a second wavelength-related parameter for the input light;

[0011] The third signal channel includes a first comb filter and a third detector, which is used to detect a third optical signal among the multiple optical signals to obtain a third wavelength-related parameter for the input light;

[0012] The fourth signal channel includes a second comb filter and a fourth detector, which are used to perform signal detection on a fourth optical signal among the multiple optical signals to obtain a fourth wavelength-related parameter for the input light.

[0013] In one possible implementation manner, the linear filter and the second detector are connected in sequence; the linear filter is used to perform linear filtering on the second optical signal, and the second detector is used to perform signal detection on the second optical signal after the linear filtering to obtain a detection value for the second optical signal, and the detection value for the second optical signal is used as a second wavelength-related parameter for the input light;

[0014] The first comb filter and the third detector are connected in sequence; the first comb filter is used to perform comb filtering on the third optical signal, and the third detector is used to perform signal detection on the third optical signal after the comb filtering to obtain a detection value for the third optical signal, and the detection value for the third optical signal is used as a third wavelength-related parameter for the input light;

[0015] The second comb filter and the fourth detector are connected in sequence; the second comb filter is used to perform comb filtering on the fourth optical signal, and the fourth detector is used to perform signal detection on the fourth optical signal after the comb filtering to obtain a detection value for the fourth optical signal, and the detection value for the fourth optical signal is used as a fourth wavelength-related parameter for the input light;

[0016] The transfer function of the second comb filter is obtained by translating the transfer function of the first comb filter.

[0017] In one possible implementation, the data processing module includes a first processing module, a second processing module, a third processing module and a fourth processing module;

[0018] The first processing module is used to obtain a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter;

[0019] The second processing module is used to obtain a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter;

[0020] The third processing module is used to obtain a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter;

[0021] The fourth processing module is used to determine the wavelength of the input light based on the wavelength estimation value, the first phase parameter and the second phase parameter.

[0022] According to a second aspect of the present application, a wavelength measurement method is provided, the method being applied to the aforementioned wavelength meter, the method comprising:

[0023] Acquire input light through an optical splitter, and divide the input light into a plurality of optical signals according to a preset ratio;

[0024] Performing signal detection on a plurality of optical signals respectively through a signal channel group to obtain a plurality of wavelength-related parameters for the input light;

[0025] The wavelength of the input light is obtained based on a plurality of wavelength-related parameters of the input light through the data processing module.

[0026] In one possible implementation manner, the signal channel group includes a first signal channel, a second signal channel, a third signal channel, and a fourth signal channel; the signal channel group is used to perform signal detection on the multiple optical signals respectively to obtain multiple wavelength-related parameters for the input light, including:

[0027] Performing signal detection on a first optical signal among the multiple optical signals by using a first detector of a first signal channel to obtain a first wavelength-related parameter for the input light;

[0028] Performing signal detection on a second optical signal among the multiple optical signals through a linear filter and a second detector of a second signal channel to obtain a second wavelength-related parameter for the input light;

[0029] Performing signal detection on a third optical signal among the multiple optical signals through a first comb filter and a third detector of a third signal channel to obtain a third wavelength-related parameter for the input light;

[0030] The fourth optical signal among the multiple optical signals is detected by the second comb filter and the fourth detector of the fourth signal channel to obtain a fourth wavelength-related parameter for the input light.

[0031] In one possible implementation manner, the detecting a second optical signal among the plurality of optical signals by using a linear filter of the second signal channel and a second detector to obtain a second wavelength-related parameter for the input light includes:

[0032] Linearly filtering the second optical signal through a linear filter, and detecting the second optical signal after the linear filtering through a second detector to obtain a detection value for the second optical signal, and using the detection value for the second optical signal as a second wavelength-related parameter for the input light;

[0033] The method of detecting a third optical signal among the multiple optical signals through the first comb filter and the third detector of the third signal channel to obtain a third wavelength-related parameter for the input light includes:

[0034] Performing comb filtering on the third optical signal through the first comb filter, and performing signal detection on the third optical signal after the comb filtering through the third detector to obtain a detection value for the third optical signal, and using the detection value for the third optical signal as a third wavelength-related parameter for the input light;

[0035] The method of detecting a fourth optical signal among the plurality of optical signals through the second comb filter and the fourth detector of the fourth signal channel to obtain a fourth wavelength-related parameter for the input light includes:

[0036] The fourth optical signal is comb-filtered by the second comb filter, and the fourth optical signal after comb filtering is detected by the fourth detector to obtain a detection value for the fourth optical signal, and the detection value for the fourth optical signal is used as a fourth wavelength-related parameter for the input light.

[0037] In one embodiment, the data processing module includes a first processing module, a second processing module, a third processing module and a fourth processing module; the data processing module obtains the wavelength of the input light based on a plurality of wavelength-related parameters of the input light, including:

[0038] Obtaining, by the first processing module, a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter;

[0039] Obtaining, by a second processing module, a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter;

[0040] Obtaining, by a third processing module, a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter;

[0041] The wavelength of the input light is determined by a fourth processing module based on the wavelength estimation value, the first phase parameter and the second phase parameter.

[0042] The wavelength meter and wavelength measurement method provided by the present application include: a spectrometer for acquiring input light and dividing the input light into multiple optical signals according to a preset ratio; a signal channel group for performing signal detection on the multiple optical signals respectively to obtain multiple wavelength-related parameters for the input light; and a data processing module for obtaining the wavelength of the input light based on the multiple wavelength-related parameters for the input light. The wavelength meter of the present application is small in size and low in cost, and can realize accurate measurement of the wavelength of the light source.

[0043] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present application, nor is it intended to limit the scope of the present application. Other features of the present application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become readily understood. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, wherein:

[0045] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0046] Figure 1 A schematic diagram of the composition of a wavelength meter according to an embodiment of the present application is shown;

[0047] Figure 2 A schematic diagram of a loss function of a linear filter according to an embodiment of the present application is shown;

[0048] Figure 3 The spectrum diagram of the first comb filter and the second comb filter in the embodiment of the present application is shown in FIG. Figure 1 ;

[0049] Figure 4 The spectrum diagram of the first comb filter and the second comb filter in the embodiment of the present application is shown in FIG. Figure 2 ;

[0050] Figure 5 An example diagram of intuitively determining the target phase value of an embodiment of the present application is shown;

[0051] Figure 6 A schematic diagram of the implementation flow of the wavelength measurement method according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0052] In order to make the purpose, features, and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0053] The present application embodiment provides a wavelength meter, Figure 1 This is a schematic diagram of the composition of the wavelength meter of the present application embodiment, refer to Figure 1 As shown, the wavelength meter comprises:

[0054] An optical splitter, used to obtain input light and divide the input light into multiple optical signals according to a preset ratio;

[0055] A signal channel group, used to perform signal detection on a plurality of optical signals respectively, and obtain a plurality of wavelength-related parameters for the input light;

[0056] The data processing module is used to obtain the wavelength of the input light based on a plurality of wavelength-related parameters of the input light.

[0057] In the embodiment of the present application, input light enters the input end of the optical splitter, and the optical splitter divides the input light into multiple optical signals according to a preset ratio. Figure 1 This is an example of dividing the input light into four optical signals at a preset ratio of 1:1:1:1. The intensity of each optical signal is about 25% of the intensity of the incident light. The multiple optical signals passing through the optical splitter are sent to the signal channel group, and the signal channel group is used to detect each optical signal to obtain multiple detection readings for the input light, that is, wavelength-related parameters. The multiple wavelength-related parameters obtained enter the data processing module, and the data processing module performs data calculation based on the multiple wavelength-related parameters output by the signal channel group, and finally obtains the wavelength of the input light.

[0058] The wavelength meter of the embodiment of the present application includes: a spectrometer for acquiring input light and dividing the input light into multiple optical signals according to a preset ratio; a signal channel group for performing signal detection on the multiple optical signals respectively to obtain multiple wavelength-related parameters for the input light; and a data processing module for obtaining the wavelength of the input light based on the multiple wavelength-related parameters for the input light. The wavelength meter of the present application is simple in composition, does not require a complicated or high-precision mechanical structure, is small in size and low in manufacturing cost, and can achieve accurate measurement of the wavelength of the light source.

[0059] In an optional solution, the signal channel group includes a first signal channel, a second signal channel, a third signal channel and a fourth signal channel;

[0060] The first signal channel includes a first detector, which is used to detect a first optical signal among the multiple optical signals to obtain a first wavelength-related parameter for the input light;

[0061] The second signal channel includes a linear filter and a second detector, which are used to detect a second optical signal among the multiple optical signals to obtain a second wavelength-related parameter for the input light;

[0062] The third signal channel includes a first comb filter and a third detector, which is used to detect a third optical signal among the multiple optical signals to obtain a third wavelength-related parameter for the input light;

[0063] The fourth signal channel includes a second comb filter and a fourth detector, which are used to perform signal detection on a fourth optical signal among the multiple optical signals to obtain a fourth wavelength-related parameter for the input light.

[0064] refer to Figure 1As shown, under the premise that the optical splitter divides the input light into four optical signals, the signal channel group provides a signal channel for each optical signal. Among them, the first signal channel only includes one (first) detector, and the first optical signal (first optical signal) directly enters the first detector, and the first detector outputs its power reading, that is, the first wavelength-related parameter of the input light. The second signal channel includes a linear filter and a (second) detector. The second signal channel can perform signal detection on the second optical signal, and the second detector outputs its power reading, that is, the second wavelength-related parameter of the input light. The third signal channel includes a (first) comb filter and a (third) detector. The third signal channel can perform signal detection on the third optical signal, and the third detector outputs its power reading, that is, the third wavelength-related parameter of the input light. The fourth signal channel also includes a (second) comb filter and a (fourth) detector. The fourth signal channel can perform signal detection on the fourth optical signal, and the fourth detector outputs its power reading, that is, the fourth wavelength-related parameter of the input light. The aforementioned four signal channels perform signal detection on the four optical signals in parallel, and the values ​​finally detected are all entered. Figure 1 The data processing module in the apparatus performs data calculation. The scheme is simple and easy to implement, and the wavelength of the input light can be accurately obtained.

[0065] In an optional solution, the linear filter and the second detector are connected in sequence; the linear filter is used to perform linear filtering on the second optical signal, and the second detector is used to perform signal detection on the second optical signal after the linear filtering to obtain a detection value for the second optical signal, and the detection value for the second optical signal is used as a second wavelength-related parameter for the input light;

[0066] The first comb filter and the third detector are connected in sequence; the first comb filter is used to perform comb filtering on the third optical signal, and the third detector is used to perform signal detection on the third optical signal after the comb filtering to obtain a detection value for the third optical signal, and the detection value for the third optical signal is used as a third wavelength-related parameter for the input light;

[0067] The second comb filter and the fourth detector are connected in sequence; the second comb filter is used to perform comb filtering on the fourth optical signal, and the fourth detector is used to perform signal detection on the fourth optical signal after the comb filtering to obtain a detection value for the fourth optical signal, and the detection value for the fourth optical signal is used as a fourth wavelength-related parameter for the input light;

[0068] The transfer function of the second comb filter is obtained by translating the transfer function of the first comb filter.

[0069] refer to Figure 1As shown, the linear filter is connected to the second detector in sequence. The linear filter is used to perform linear filtering on the second optical signal. The second optical signal enters the linear filter and the second detector in sequence. The second detector outputs the signal detection value (second wavelength-related parameter) of the second optical signal after passing through the linear filter. The linear filter is an optical device whose insertion loss varies with the wavelength of the incident optical signal and is approximately linear on a logarithmic scale. The so-called linear filtering means that the loss value of the filter is roughly linearly related to the wavelength when expressed logarithmically. Figure 2 The loss function of this linear filter is shown. Within the wavelength range of the wavelength meter, the loss value is close to 0dB at the short wavelength end and close to -20dB at the long wavelength end. Ideally, the loss value should be a monotonically increasing or decreasing function of wavelength.

[0070] The first comb filter and the third detector are connected in sequence. The first comb filter is used to perform comb filtering on the third optical signal. The third optical signal enters the first comb filter and the third detector in sequence, and the third detector outputs the signal detection value (third wavelength-related parameter) of the third optical signal after passing through the first comb filter. The second comb filter and the fourth detector are connected in sequence. The second comb filter is used to perform comb filtering on the fourth optical signal. The fourth optical signal enters the second comb filter and the fourth detector in sequence, and the fourth detector outputs the signal detection value (fourth wavelength-related parameter) of the fourth optical signal after passing through the second comb filter. Among them, the comb filter is an optical filter with a periodic transfer function, and its period is called the free spectral range (FSR). In the embodiment of the present application, its period is in GHz. The mathematical representation and period of the transfer function of the first comb filter and the second comb filter are the same. However, the spectral type of the transfer function of the second comb filter is obtained by translating the spectral type of the transfer function of the first comb filter. It is equivalent to the transfer function of the second comb filter being obtained by translating the transfer function of the first comb filter. Reference Figure 3 As shown, Figure 3 The schematic diagram of the spectrum of the first comb filter and the second comb filter is shown in Figure 1, where the horizontal axis is the optical frequency and the vertical axis is the loss value. Assume that the transfer function of the first comb filter is Ω A , the transfer function of the second comb filter is Ω B , the periods of the first comb filter and the second comb filter are both 50 GHz, then Figure 3 The spectrum of the transfer function of the second comb filter is obtained by shifting the spectrum of the first comb filter in the positive direction by 1 / 4 FSR. In addition, the spectrum of the first comb filter and the second comb filter can also be expressed in the form of a phase-loss value logarithmic scale. Figure 4 , Figure 4 It is another schematic diagram of the spectrum of the first comb filter and the second comb filter, the horizontal axis is the phase, and the vertical axis is the logarithmic scale of the difference value. It should be noted that, Figure 3 and Figure 4 The only difference is the horizontal and vertical axes, and the meanings of the two are the same. Optical frequency and phase have a one-to-one relationship within a FSR. Figure 4 The unit of the horizontal axis is 2π. In this figure, the unit of the vertical axis is dB, and the peak-to-valley difference is about 5dB. When FSR = 50GHz (0.4nm at a wavelength of 1.55um), the average slope is about 5dB / 0.2nm = 25db / nm. Compared with the linear filter, the sensitivity of the comb filter is 125 times that of the linear filter, and its resolution can reach 1pm.

[0071] In an optional solution, the data processing module includes a first processing module, a second processing module, a third processing module and a fourth processing module;

[0072] The first processing module is used to obtain a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter;

[0073] The second processing module is used to obtain a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter;

[0074] The third processing module is used to obtain a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter;

[0075] The fourth processing module is used to determine the wavelength of the input light based on the wavelength estimation value, the first phase parameter and the second phase parameter.

[0076] In the embodiment of the present application, it is assumed that the first wavelength-related parameter is I1, the second wavelength-related parameter is I2, the third wavelength-related parameter is I3, and the fourth wavelength-related parameter is I4. Since the first wavelength-related parameter is obtained by directly detecting the first optical signal through the first detector, I1 is used as a reference value for calculating the wavelength of the input light. The first processing module is used to obtain a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter, specifically based on the ratio of I2 to I1. Specifically, the second wavelength-related parameter is compared with the first wavelength-related parameter to obtain a loss value for the input light. That is, the value of I2 / I1 is the loss value of the input light passing through the linear filter.

[0077] After obtaining the loss value of the input light passing through the linear filter, the wavelength estimation value of the input light can be calculated by combining the known linear filter loss function. Figure 2As shown, there is a probabilistic linear relationship between the wavelength loss value of the linear filter and the wavelength. Each loss value has a unique wavelength corresponding to it, and the corresponding relationship is stored in the memory of the wavelength meter. According to the loss value of the input light and the known loss function, the approximate wavelength value of the input light can be estimated.

[0078] The wavelength detection sensitivity is determined by the slope of the linear filter and the noise of reading I1 and I2. Assuming that the slope of the linear filter is 20dB / 100nm=0.2dB / nm, and the noise of reading I1 and I2 is about 0.01dB, the wavelength detection sensitivity is about 0.02dB / (0.2dB / nm)=0.1nm. This is the approximate wavelength resolution that the linear filter can achieve. If the FSR of the comb filter is 50GHz (about 400pm near the wavelength of 1550nm), the accuracy of the linear filter is sufficient to measure the wavelength accuracy of the input light to within half the FSR.

[0079] The second processing module is used to obtain a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter, specifically based on the ratio of I3 to I1. The third processing module is used to obtain a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter, specifically based on the ratio of I4 to I1. The fourth processing module is used to determine the wavelength of the input light based on the wavelength estimation value, the first phase parameter and the second phase parameter, specifically based on the aforementioned three ratios.

[0080] In the embodiment of the present application, the linear filter can be implemented based on a low-cost multilayer coating. Through the first to fourth processing modules, it is possible to use I2 / I1 to roughly measure the wavelength based on the linear filter, and its accuracy must be within half FSR; in order to improve the sensitivity of wavelength detection, two comb filters are introduced for fine wavelength detection. The comb filter can be a Fabry-Perot standard or other types of interference devices. Based on two comb filters, I3 / I1 and I4 / I1 are used to accurately measure the wavelength with an accuracy of 1pm.

[0081] The fourth processing module is specifically used to obtain the target phase value based on I3 / I1 and I4 / I1. Figure 3 As shown, the spectra of the first comb filter and the second comb filter are both generated by an etalon with a reflectivity of 30%. The transfer function of the first comb filter is Ω A And the transfer function of the second comb filter Ω B The functional expressions of are shown in the following formulas (1) and (2):

[0082]

[0083] Where α is the etalon factor, which is calculated by formula (3):

[0084]

[0085] Where R is the reflectivity of the two reflective surfaces of the etalon, such as 30% as mentioned above. ν is Figure 3 The horizontal axis shows the optical frequency. ν0 is the free spectral range of the etalon, which is calculated by formula (4):

[0086]

[0087] Where C is the speed of light and L is the optical path length of the etalon.

[0088] When the optical frequency ν=mν0, the transfer function Ω A =1 (maximum value), where m is an integer.

[0089] The optical phase θ generated by the two reflection surfaces of the round-trip etalon can be expressed as shown in formula (5):

[0090]

[0091] Where λ is the wavelength of the input light. Then formula (1) and formula (2) can be expressed as:

[0092]

[0093] The value of I3 / I1 is Ω A , the value of I4 / I1 is Ω B .but,

[0094]

[0095] Substituting the values ​​of I3 / I1 and I4 / I1 into formula (8) and formula (9), we can obtain the values ​​of ξ and μ. Then we can determine the unique target phase value θ, that is,

[0096]

[0097] For example, assuming Ω A =-5dB,Ω B =-2dB, then the target phase value calculated by formula (10) is approximately 0.82π. Figure 5 As shown, Figure 5 This is a visual example diagram of the target phase value of the embodiment of the present application. Figure 5 It can be seen that Ω A The value is -5dB and Ω BWhen the value is -2dB, it corresponds to a unique horizontal axis value, which is between 0 and 0.5, about 0.41. Because its horizontal axis coordinate is 2π, the corresponding target phase value ( Figure 5 θ0) in is 0.41×2π, which is 0.82π, consistent with the target phase value calculated by formula (10).

[0098] After obtaining the target phase value, the fourth processing module changes the frequency of the light by one FSR, which is equivalent to a phase of 2π, for the convenience of calculation. P The (first) mapping relationship expressed as a phase angle θ is:

[0099]

[0100] When the FSR and the target phase value are known, they are substituted into formula (11) to obtain the target frequency offset value. Taking the FSR as 50 GHz and the target phase value as 0.82π as an example, the corresponding target frequency offset value is 20.5 GHz.

[0101] Assume that a wave meter is used to measure the ini To V end The optical frequency is , and in this frequency range, for the comb filter, there are N resonant frequencies, called V1, V2, ..., V N , then any optical frequency in this region can be written as:

[0102] f=ν p +k·FSR Formula (12)

[0103] Then when v p When λ is the target frequency offset value and k is the wavelength estimation value, substitute it into formula (12) to obtain f at this time. f is the target frequency of the input light, and its corresponding wavelength λ is:

[0104]

[0105] Where C is the speed of light and f is the target frequency of the input light.

[0106] In an optional solution, the intensities of the multiple optical signals are the same or different. Usually, the intensities of the multiple optical signals are substantially the same. Even if they are different, as long as the intensity distribution between the multiple channels is known in advance, the multiple optical signals are detected separately to obtain the accurate wavelength of the input light.

[0107] The present application embodiment provides a wavelength measurement method, which is applied to the aforementioned wavelength meter, such as Figure 6 As shown, the method includes:

[0108] S601: Acquire input light through an optical splitter, and divide the input light into multiple optical signals according to a preset ratio.

[0109] This step is implemented by the aforementioned spectrometer of the wavelength meter. For the specific process, please refer to the detailed description of the aforementioned related parts and will not be repeated here.

[0110] S602: Perform signal detection on multiple optical signals respectively through the signal channel group to obtain multiple wavelength-related parameters for the input light.

[0111] This step is implemented through the aforementioned signal channel group of the wavelength meter. For the specific process, please refer to the detailed description of the aforementioned related parts and will not be repeated here.

[0112] S603: Obtaining the wavelength of the input light based on a plurality of wavelength-related parameters of the input light through a data processing module.

[0113] This step is implemented by the aforementioned data processing module of the wavelength meter. For the specific process, please refer to the detailed description of the aforementioned relevant parts and will not be repeated here.

[0114] In the scheme shown in steps S601 to S603, input light is obtained and divided into multiple optical signals according to a preset ratio; signal detection is performed on the multiple optical signals respectively to obtain multiple wavelength-related parameters for the input light; and the wavelength of the input light is obtained based on the multiple wavelength-related parameters for the input light. Accurate measurement of the wavelength of the light source can be achieved based on a small and low-cost wavelength meter.

[0115] In an optional solution, the signal channel group includes a first signal channel, a second signal channel, a third signal channel and a fourth signal channel; the signal channel group is used to detect the multiple optical signals respectively to obtain multiple wavelength-related parameters for the input light, including:

[0116] Performing signal detection on a first optical signal among the multiple optical signals by using a first detector of a first signal channel to obtain a first wavelength-related parameter for the input light;

[0117] Performing signal detection on a second optical signal among the multiple optical signals through a linear filter and a second detector of a second signal channel to obtain a second wavelength-related parameter for the input light;

[0118] Performing signal detection on a third optical signal among the multiple optical signals through a first comb filter and a third detector of a third signal channel to obtain a third wavelength-related parameter for the input light;

[0119] The fourth optical signal among the multiple optical signals is detected by the second comb filter and the fourth detector of the fourth signal channel to obtain a fourth wavelength-related parameter for the input light.

[0120] In the present application, the first optical signal among the multiple optical signals is detected by the first detector of the first signal channel of the aforementioned wavelength meter. The second optical signal among the multiple optical signals is detected by the linear filter and the second detector of the second signal channel of the aforementioned wavelength meter. The third optical signal among the multiple optical signals is detected by the first comb filter and the third detector of the third signal channel of the aforementioned wavelength meter. The fourth optical signal among the multiple optical signals is detected by the second comb filter and the fourth detector of the fourth signal channel of the aforementioned wavelength meter. For the specific process, please refer to the detailed description of the aforementioned related parts, which will not be repeated here.

[0121] In an optional solution, the detecting a second optical signal among the multiple optical signals by using a linear filter of the second signal channel and a second detector to obtain a second wavelength-related parameter for the input light includes:

[0122] Linearly filtering the second optical signal through a linear filter, and detecting the second optical signal after the linear filtering through a second detector to obtain a detection value for the second optical signal, and using the detection value for the second optical signal as a second wavelength-related parameter for the input light;

[0123] The method of detecting a third optical signal among the multiple optical signals through the first comb filter and the third detector of the third signal channel to obtain a third wavelength-related parameter for the input light includes:

[0124] Performing comb filtering on the third optical signal through the first comb filter, and performing signal detection on the third optical signal after the comb filtering through the third detector to obtain a detection value for the third optical signal, and using the detection value for the third optical signal as a third wavelength-related parameter for the input light;

[0125] The method of detecting a fourth optical signal among the plurality of optical signals through the second comb filter and the fourth detector of the fourth signal channel to obtain a fourth wavelength-related parameter for the input light includes:

[0126] The fourth optical signal is comb-filtered by the second comb filter, and the fourth optical signal after comb filtering is detected by the fourth detector to obtain a detection value for the fourth optical signal, and the detection value for the fourth optical signal is used as a fourth wavelength-related parameter for the input light.

[0127] In the present application, the processing process of the linear filter, the second detector, the first comb filter, the third detector, the second comb filter and the fourth detector can be referred to the above-mentioned specific description of each module of the wavelength meter, which will not be repeated here.

[0128] In an optional solution, the data processing module includes a first processing module, a second processing module, a third processing module and a fourth processing module; the data processing module obtains the wavelength of the input light based on a plurality of wavelength-related parameters of the input light, including:

[0129] Obtaining, by the first processing module, a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter;

[0130] Obtaining, by a second processing module, a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter;

[0131] Obtaining, by a third processing module, a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter;

[0132] The wavelength of the input light is determined by a fourth processing module based on the wavelength estimation value, the first phase parameter and the second phase parameter.

[0133] In the present application, the processing processes of the first processing module, the second processing module, the third processing module and the fourth processing module can be found in the above-mentioned specific description of each module of the wavelength meter, which will not be repeated here.

[0134] In an optional solution, the intensities of the multiple optical signals are the same or different. Usually, the intensities of the multiple optical signals are substantially the same. Even if they are different, as long as the intensity distribution between the multiple channels is known in advance, the multiple optical signals are detected separately to obtain the accurate wavelength of the input light.

[0135] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution disclosed in this application can be achieved, and this document is not limited here.

[0136] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0137] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wavelength meter, characterized in that: The wavelength meter comprises: An optical splitter, used to obtain input light and divide the input light into multiple optical signals according to a preset ratio; A signal channel group, used to perform signal detection on a plurality of optical signals respectively, and obtain a plurality of wavelength-related parameters for the input light; The data processing module is used to obtain the wavelength of the input light based on a plurality of wavelength-related parameters of the input light.

2. The wavelength meter according to claim 1, characterized in that The signal channel group includes a first signal channel, a second signal channel, a third signal channel and a fourth signal channel; The first signal channel includes a first detector, which is used to detect a first optical signal among the multiple optical signals to obtain a first wavelength-related parameter for the input light; The second signal channel includes a linear filter and a second detector, which are used to detect a second optical signal among the multiple optical signals to obtain a second wavelength-related parameter for the input light; The third signal channel includes a first comb filter and a third detector, which is used to detect a third optical signal among the multiple optical signals to obtain a third wavelength-related parameter for the input light; The fourth signal channel includes a second comb filter and a fourth detector, which are used to perform signal detection on a fourth optical signal among the multiple optical signals to obtain a fourth wavelength-related parameter for the input light.

3. The wavelength meter according to claim 2, characterized in that The linear filter is connected to the second detector in sequence; the linear filter is used to perform linear filtering on the second optical signal; the second detector is used to perform signal detection on the second optical signal after the linear filtering, obtain a detection value for the second optical signal, and use the detection value for the second optical signal as a second wavelength-related parameter for the input light; The first comb filter and the third detector are connected in sequence; the first comb filter is used to perform comb filtering on the third optical signal, and the third detector is used to perform signal detection on the third optical signal after the comb filtering to obtain a detection value for the third optical signal, and the detection value for the third optical signal is used as a third wavelength-related parameter for the input light; The second comb filter and the fourth detector are connected in sequence; the second comb filter is used to perform comb filtering on the fourth optical signal, and the fourth detector is used to perform signal detection on the fourth optical signal after the comb filtering to obtain a detection value for the fourth optical signal, and the detection value for the fourth optical signal is used as a fourth wavelength-related parameter for the input light; The transfer function of the second comb filter is obtained by translating the transfer function of the first comb filter.

4. The wavelength meter according to claim 2 or 3, characterized in that: The data processing module includes a first processing module, a second processing module, a third processing module and a fourth processing module; The first processing module is used to obtain a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter; The second processing module is used to obtain a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter; The third processing module is used to obtain a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter; The fourth processing module is used to determine the wavelength of the input light based on the wavelength estimation value, the first phase parameter and the second phase parameter.

5. A wavelength measurement method, characterized in that: The method is applied to the wavelength meter according to any one of claims 1 to 4, and the method comprises: Acquire input light through an optical splitter, and divide the input light into a plurality of optical signals according to a preset ratio; Performing signal detection on a plurality of optical signals respectively through a signal channel group to obtain a plurality of wavelength-related parameters for the input light; The wavelength of the input light is obtained based on a plurality of wavelength-related parameters of the input light through the data processing module.

6. The method according to claim 5, characterized in that The signal channel group includes a first signal channel, a second signal channel, a third signal channel and a fourth signal channel; the signal channel group is used to detect the multiple optical signals respectively to obtain multiple wavelength-related parameters for the input light, including: Performing signal detection on a first optical signal among the multiple optical signals by using a first detector of a first signal channel to obtain a first wavelength-related parameter for the input light; Performing signal detection on a second optical signal among the multiple optical signals through a linear filter and a second detector of a second signal channel to obtain a second wavelength-related parameter for the input light; Performing signal detection on a third optical signal among the multiple optical signals through a first comb filter and a third detector of a third signal channel to obtain a third wavelength-related parameter for the input light; The fourth optical signal among the multiple optical signals is detected by the second comb filter and the fourth detector of the fourth signal channel to obtain a fourth wavelength-related parameter for the input light.

7. The method according to claim 6, characterized in that The method of detecting a second optical signal among the plurality of optical signals by using a linear filter of the second signal channel and a second detector to obtain a second wavelength-related parameter for the input light comprises: Linearly filtering the second optical signal through a linear filter, and detecting the second optical signal after the linear filtering through a second detector to obtain a detection value for the second optical signal, and using the detection value for the second optical signal as a second wavelength-related parameter for the input light; The method of detecting a third optical signal among the multiple optical signals through the first comb filter and the third detector of the third signal channel to obtain a third wavelength-related parameter for the input light includes: Performing comb filtering on the third optical signal through the first comb filter, and performing signal detection on the third optical signal after the comb filtering through the third detector to obtain a detection value for the third optical signal, and using the detection value for the third optical signal as a third wavelength-related parameter for the input light; The method of detecting a fourth optical signal among the plurality of optical signals through the second comb filter and the fourth detector of the fourth signal channel to obtain a fourth wavelength-related parameter for the input light includes: The fourth optical signal is comb-filtered by the second comb filter, and the fourth optical signal after comb filtering is detected by the fourth detector to obtain a detection value for the fourth optical signal, and the detection value for the fourth optical signal is used as a fourth wavelength-related parameter for the input light.

8. The method according to claim 6 or 7, characterized in that: The data processing module includes a first processing module, a second processing module, a third processing module and a fourth processing module; the data processing module obtains the wavelength of the input light based on a plurality of wavelength-related parameters of the input light, including: Obtaining, by the first processing module, a wavelength estimation value for the input light based on the second wavelength-related parameter and the first wavelength-related parameter; Obtaining, by a second processing module, a first phase parameter for the input light based on the third wavelength-related parameter and the first wavelength-related parameter; Obtaining, by a third processing module, a second phase parameter for the input light based on the fourth wavelength-related parameter and the first wavelength-related parameter; The wavelength of the input light is determined by a fourth processing module based on the wavelength estimation value, the first phase parameter and the second phase parameter.

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