Communication spectrum scanning device

Abstract

The invention provides a communication spectrum scanning device, which comprises a main controller, a driving circuit, a tunable optical filter, a Coupler optical splitter, a wavelength attenuator, a detection photoelectric detector, a monitoring photoelectric detector, an amplifying circuit and a sampling circuit, and is characterized in that sampling results of detection light and monitoring light are compared by combining a wavelength loss corresponding relation of the wavelength attenuator; and the wavelength deviation of the detection result is calculated and compensated, so that the spectrum scanning result is more accurate.

Description

Technical Field

[0001] The invention relates to a communication spectrum scanning device. Background Art

[0002] In the current optical communication field, spectrum detection is a conventional optical communication quality detection, diagnosis and early warning method. In spectrum detection equipment, tunable optical filters are widely used. This device often has moving parts. During repeated scanning tasks, its wavelength position may deviate, that is, with the same driving voltage, the filter window will shift. Currently, only a non-monitoring method is often used, which cannot compensate for the deviation. Summary of the invention

[0003] The purpose of the present invention is to provide a communication spectrum scanning detection device to address the above-mentioned shortcomings of communication spectrum scanning detection. The spectrum detection deviation achieved by the tunable optical filter is compensated to improve the accuracy of the communication spectrum. To this end, the present invention adopts the following technical solutions:

[0004] A communication spectrum scanning device comprises a main controller, a driving circuit, a tunable optical filter, a Coupler optical splitter, a wavelength attenuator, a detection photodetector, a monitoring photodetector, an amplifying circuit and a sampling circuit. The main controller controls the tunable optical filter to be at different wavelength window positions through the driving circuit. After the input light passes through the tunable optical filter, the output light at the target wavelength position in the spectrum is output. The output light passes through the Coupler optical splitter and is divided into two parts, one part is the detection light and the other part is the monitoring light. The detection light enters the detection photodetector, generates a photocurrent to form a signal and enters the amplifying circuit. The output result is sampled by the sampling circuit and collected by the main controller. The monitoring light first passes through the wavelength attenuator and then enters the monitoring photodetector, generates a photocurrent to form a signal and enters the amplifying circuit. The output result is sampled by the sampling circuit and collected by the main controller. A wavelength attenuation table is pre-stored in the main controller. The wavelength attenuation table specifies the loss data of different wavelengths. The main controller calculates the wavelength deviation of the tunable optical filter according to the sampling results of the detection light and the monitoring light and the wavelength attenuation table, and compensates the detection result.

[0005] Furthermore, the wavelength attenuator has different insertion losses for different wavelengths, but the insertion loss for the same wavelength is fixed.

[0006] Furthermore, the insertion loss of the wavelength attenuator for one or more wavelengths is very small, within 3 dB, but the insertion loss for other wavelengths is very large, above 15 dB.

[0007] Furthermore, the Coupler optical splitter outputs the detection light and the monitoring light in a certain ratio, and the ratio of the detection light to the monitoring light is 10:1, or 8:2, or 95:5.

[0008] Furthermore, during production, the attenuation of each wavelength is tested to form a wavelength attenuation table, which is stored in the memory of the main controller or the memory of the communication spectrum scanning device.

[0009] Furthermore, during production, the correspondence between the filter window wavelength and the control voltage of the tunable optical filter is calibrated to form a voltage-wavelength table, which is stored in the memory of the main controller or the memory of the communication spectrum scanning device.

[0010] Furthermore, the wavelength deviation is obtained by calculating the difference between the peak positions of the monitoring light signal and the detection light signal.

[0011] In the present invention, the main controller controls the driving voltage of the tunable optical filter and scans the spectrum. The light of the tunable optical filter is divided into two paths. For the detection signal, a monitoring signal is synchronously formed. The detection light signal is sampled after photoelectric conversion and amplification. The monitoring light first passes through a dedicated wavelength attenuator and is sampled after photoelectric conversion and amplification. Combined with the optical data of the wavelength attenuator, the wavelength offset of the tunable optical filter is obtained by analyzing the shape difference of the two-path scanning data, and then the detection result is compensated.

[0012] By adopting the technical solution of the present invention, the present invention can compensate for the wavelength deviation of the tunable optical filter in the process of repeated spectrum scanning, so that the spectrum scanning result is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0014] Figure 2 is an attenuation and wavelength curve of a wavelength attenuator in an embodiment of the present invention;

[0015] Figure 3 It is a difference curve between the monitoring light signal recovery data and the detection light data in the embodiment of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0017] The present invention provides a communication spectrum scanning device, including a main controller 1, a driving circuit 2, a tunable optical filter 3, a coupler spectrometer 4, a wavelength attenuator 8, a detection photodetector 9, a monitoring photodetector 5, an amplifier circuit, and a sampling circuit. The amplifier circuit includes an amplifier circuit 6 for detecting optical signals and an amplifier circuit 10 for monitoring optical signals. The sampling circuit includes a sampling circuit 7 for detecting optical signals and a sampling circuit 11 for monitoring optical signals. The above devices and circuits are all prior art. In this embodiment, the tunable optical filter 3 adopts a MEMS tunable filter, the amplifier circuit adopts a logarithmic operational amplifier, and the main control chip 1 adopts a 32-bit MCU.

[0018] The main controller 1 controls the tunable optical filter 3 to be at different wavelength window positions through the driving circuit 2. After the input light passes through the tunable optical filter, the output light at the target wavelength position in the spectrum is output. The output light passes through the Coupler splitter 4 and is divided into two parts, one part is the detection light 12 and the other part is the monitoring light 13. In this embodiment, the ratio of the detection light to the monitoring light is 8:2.

[0019] The detection light 12 enters the detection photodetector 9, generates a photocurrent to form a signal that enters the amplifier circuit 6. The output result is sampled by the sampling circuit 7 and collected by the main controller 1. The monitoring light 13 first passes through the wavelength attenuator 8, and then enters the monitoring photodetector 5, generates a photocurrent to form a signal that enters the amplifier circuit 10. The output result is sampled by the sampling circuit 11 and collected by the main controller 1.

[0020] A wavelength attenuation table of the wavelength attenuator 8 is pre-stored in the main controller, and the wavelength attenuation table specifies the loss data of the wavelength attenuator for different wavelengths. The data table is written into the module for storage after being tested using a wavelength attenuation test system during the production phase. The main controller obtains the wavelength deviation of the tunable optical filter through iterative calculation or deviation estimation based on the sampling results of the detection light and the monitoring light and the wavelength attenuation table, and compensates for the detection result.

[0021] Figure 2 This is the attenuation and wavelength curve of the wavelength attenuator corresponding to the wavelength attenuation table of this embodiment, the ordinate is the attenuation value, and the abscissa is the wavelength point (the wavelength at the 0 coordinate is 1525 nm, and the interval between each point is 10 pm).

[0022] The voltage-wavelength table of the MEMS tunable filter is also stored in the memory of the main controller. During production, the correspondence between the filter window wavelength and the control voltage of the tunable optical filter is calibrated to form a voltage-wavelength table. The voltage-wavelength table corresponds to the voltage-wavelength curve of the tunable optical filter, in which the ordinate is the voltage value and the abscissa is the wavelength.

[0023] The main controller 1 controls the driving circuit 2 to make the MEMS tunable filter 3 filter the signal wavelength by wavelength. After amplification and sampling, the photoelectric signal of each wavelength is acquired and stored by the program of the main controller. The signal data of the monitoring light 13 needs to be compensated and restored in combination with the data of the wavelength attenuator 8, including normalizing and aligning the signal amplitude with the signal amplitude of the detection light 12 according to the splitting ratio of the Coupler, and then comparing the restored result of the monitoring light 13 signal with the signal of the detection light 12. If the wavelength of the tunable filter 3 is offset, there is a difference between the data recovered from the monitoring light 13 signal and the signal data of the detection light 12. After subtracting the two, a similar result is obtained. Figure 3 At this time, the data of the wavelength attenuator 8 is shifted, and then the monitoring light 13 signal is restored and compared with the signal data of the detection light 12. After multiple iterations, the difference is finally eliminated and the shift amplitude is determined. This value is the wavelength offset value of the tunable filter 3.

[0024] The above description is only a specific embodiment of the present invention, but the structural features of the present invention are not limited thereto. Any changes or modifications made by any technician in the field of the present invention are all included in the protection scope of the present invention.

Claims

1. A communication spectrum scanning device, characterized in that: The invention comprises a main controller, a driving circuit, a tunable optical filter, a Coupler optical splitter, a wavelength attenuator, a detection photodetector, a monitoring photodetector, an amplifying circuit and a sampling circuit. The main controller controls the tunable optical filter to be at different wavelength window positions through the driving circuit. After the input light passes through the tunable optical filter, the output light at the target wavelength position in the spectrum is output. The output light passes through the Coupler optical splitter and is divided into two parts, one part is the detection light and the other part is the monitoring light. The detection light enters the detection photodetector, generates a photocurrent to form a signal and enters the amplifying circuit. The output result is sampled by the sampling circuit and collected by the main controller. The monitoring light first passes through the wavelength attenuator and then enters the monitoring photodetector, generates a photocurrent to form a signal and enters the amplifying circuit. The output result is sampled by the sampling circuit and collected by the main controller. A wavelength attenuation table is pre-stored in the main controller. The wavelength attenuation table specifies the loss data of different wavelengths. The main controller calculates the wavelength deviation of the tunable optical filter according to the sampling results of the detection light and the monitoring light and the wavelength attenuation table, and compensates the detection result.

2. A communication spectrum scanning device according to claim 1, characterized in that: The wavelength attenuator has different insertion losses for different wavelengths, but the insertion loss for the same wavelength is fixed.

3. A communication spectrum scanning device according to claim 1, characterized in that: The Coupler splitter outputs the detection light and the monitoring light in a certain ratio, and the ratio of the detection light to the monitoring light is 10:1, or 8:2, or 95:

5.

4. A communication spectrum scanning device according to claim 1, characterized in that: During production, the attenuation of each wavelength is tested to form a wavelength attenuation table, which is stored in the memory of the main controller or the memory of the communication spectrum scanning device.

5. A communication spectrum scanning device according to claim 1, characterized in that: During production, the correspondence between the filter window wavelength and the control voltage of the tunable optical filter is calibrated to form a voltage-wavelength table, which is stored in the memory of the main controller or the memory of the communication spectrum scanning device.

6. The communication spectrum scanning device according to claim 1, characterized in that: The wavelength deviation is obtained by calculating the peak position difference between the monitoring light signal and the detection light signal.

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