CN115061285A - Spectral shaping method and device - Google Patents

Abstract

The invention discloses a spectrum shaping method. The spectrum shaping method of the invention divides the original optical signal into a plurality of sub-band signals with different wavelengths by utilizing a wavelength division multiplexing structure, adjusts the amplitude and/or the phase of at least one sub-band signal, and then combines and outputs all the sub-band signals by utilizing the same wavelength division multiplexing structure to obtain the optical signal after spectrum shaping. The invention also discloses a spectrum shaping device. Compared with the prior art, the optical signal is divided into a plurality of channels through the wavelength division multiplexing structure, the amplitude and/or the phase of each channel are independently adjusted, then the adjusted channel signals are multiplexed and output by the wavelength division multiplexing structure, each channel is independently controlled, the adjustment logic is clear, and the power consumption is reduced; and because the scheme is easy to realize on-chip integration, the environmental vibration interference can be effectively resisted.

Description

Spectral shaping method and device

technical field

The present invention relates to a spectral shaping method and device.

Background technique

In the research and development of optical communication, spectral measurement and other systems, the transmission spectrum of the system is usually changed according to the requirements, and the changed parameters include the central wavelength, bandwidth, envelope, dispersion, attenuation, etc. of the spectrum. The current commercialized solution is an arbitrary spectral response device based on spatial light modulators.

However, arbitrary spectral response devices based on spatial light modulators are usually large in size, have high power consumption, and are greatly affected by environmental vibrations.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a spectral shaping method and device capable of realizing arbitrary spectral responses, with lower power consumption, unaffected by environmental vibration, and clear adjustment logic.

The present invention specifically adopts the following technical solutions to solve the above-mentioned technical problems:

A spectral shaping method, which uses a wavelength division multiplexing structure to divide an original optical signal into multiple sub-band signals of different wavelengths, and performs amplitude and/or phase adjustment on at least one sub-band signal, and then uses the same wavelength division multiplexing. The structure combines and outputs all the sub-band signals to obtain a spectrally shaped optical signal.

Preferably, the wavelength division multiplexing structure is one of the following structures: cascaded microring filters, cascaded reverse directional couplers, arrayed waveguide gratings, echelle diffraction gratings, and MZI lattice filters.

Preferably, the amplitude adjustment is performed using a Mach-Zehnder interferometer, or an electro-absorption modulator, or a micro-ring modulator.

Preferably, the phase adjustment is performed using a thermally or electrically regulated phase shifter.

Based on the same inventive concept, the following technical solutions can also be obtained:

A spectral shaping device, comprising:

The first wavelength division multiplexing structure is used to divide the original optical signal into a plurality of subband signals of different wavelengths;

an amplitude and phase adjustment module, configured to perform amplitude and/or phase adjustment on at least one subband signal;

The second wavelength division multiplexing structure, which is the same as the first wavelength division multiplexing structure, is used for multiplexing and outputting all sub-band signals to obtain a spectrally shaped optical signal.

Preferably, the first wavelength division multiplexing structure and the second wavelength division multiplexing structure are one of the following structures: cascaded microring filters, cascaded reverse directional couplers, arrayed waveguide gratings, echelle diffraction gratings, MZI lattice filters.

Preferably, the amplitude and phase adjustment module uses a Mach-Zehnder interferometer, or an electro-absorption modulator, or a micro-ring modulator to perform the amplitude adjustment.

Preferably, the phase adjustment module uses a thermally or electrically regulated phase shifter to perform the phase adjustment.

Preferably, the spectral shaping device is an optically integrated component.

Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

The invention divides the optical signal into a plurality of channels through the wavelength division multiplexing structure, and independently adjusts the amplitude and/or phase of each channel, and then combines the adjusted signals of each channel with the wavelength division multiplexing structure to output, Each channel is independently controlled, the adjustment logic is clear, and power consumption is reduced; and because the solution is easy to implement on-chip integration, it can effectively resist environmental vibration interference.

Description of drawings

Fig. 1 is the structural principle schematic diagram of the spectrum shaping device of the present invention;

FIG. 2 is a schematic diagram of a wavelength division multiplexing structure composed of cascaded micro-ring filters;

FIG. 3 is a schematic diagram of a wavelength division multiplexing structure composed of cascaded reverse couplers.

Detailed ways

In view of the shortcomings of the prior art, the solution of the present invention is to divide the optical signal into a plurality of channels with different wavelengths through a wavelength division multiplexing structure, and independently adjust the amplitude and/or phase of each channel, and then use the wavelength division multiplexing structure. The adjusted signal of each channel is combined and output by the wavelength division multiplexing structure, and each channel is independently controlled, the adjustment logic is clear, and the power consumption is reduced; and because the solution is easy to realize on-chip integration, it can effectively resist environmental vibration interference.

A spectral shaping method, which uses a wavelength division multiplexing structure to divide an original optical signal into multiple sub-band signals of different wavelengths, and performs amplitude and/or phase adjustment on at least one sub-band signal, and then uses the same wavelength division multiplexing. The structure combines and outputs all the sub-band signals to obtain a spectrally shaped optical signal.

A spectral shaping device, comprising:

The first wavelength division multiplexing structure is used to divide the original optical signal into a plurality of subband signals of different wavelengths;

an amplitude and phase adjustment module, configured to perform amplitude and/or phase adjustment on at least one subband signal;

The second wavelength division multiplexing structure, which is the same as the first wavelength division multiplexing structure, is used for multiplexing and outputting all sub-band signals to obtain a spectrally shaped optical signal.

In order to facilitate the understanding of the public, the technical solutions of the present invention are described in detail below in conjunction with the accompanying drawings:

The technical principle of the present invention is shown in FIG. 1 , a broad-spectrum original optical signal is input from the left input waveguide, the amplitude of the optical signal is |A|, and the spectral coverage wavelength range is λ1～λn; wavelength division multiplexing (WDM) structure Realize the split coupling of sub-band signals of different wavelengths, such as the sub-band light of wavelength λ1-λ2 enters channel 1, the sub-band light of wavelength λ2-λ3 enters channel 2, and so on; each branch has an independent amplitude The modulator and the phase modulator can independently adjust the amplitude and/or phase; finally, the wave is combined through the same wavelength division multiplexing structure, and the spectrally shaped optical signal is output from the right output waveguide.

The wavelength division multiplexing structure can be various existing or future structures, such as cascaded micro-ring filters, cascaded reverse directional couplers (Contra-Directional Coupler), AWG (Arrayed Waveguide Grating, arrayed waveguide grating) , EDG (Echelle Diffraction Grating, Echelle Diffraction Grating), MZI lattice filters and other structures. Taking into account the adjustment accuracy of the spectrum, cascaded micro-ring filters or cascaded reverse-direction couplers are preferred. Figure 2 and Figure 3 show the wavelength division multiplexing structure composed of cascaded micro-ring filters and cascaded reverse coupling. The wavelength division multiplexing structure composed of the device.

其中n_eff为波导有效折射率，r为微环半径，N为正整数，通过改变微环的半径可以调整谐振波长，从而输出不同的波长进入不同的信道。For a microring filter, the resonant wavelength is

where n _eff is the effective refractive index of the waveguide, r is the radius of the microring, and N is a positive integer. The resonant wavelength can be adjusted by changing the radius of the microring, so that different wavelengths can be output into different channels.

For the reverse coupler, its resonant wavelength is λ0=Λ(n _eff1 +n _eff2 ), where Λ is the grating period, n _eff1 and n _eff2 are the effective refractive indices of the two coupled waveguides, respectively. By adjusting the grating period, the Reverse coupling is achieved without resonant wavelengths, so that the output enters a different channel.

Amplitude modulation can adopt Mach-Zehnder interferometer (MZI), electro-absorption modulator, micro-ring modulator, etc.

Phase modulation can use thermal or electrical phase shifters.

By adopting the technical scheme of the present invention to perform spectral shaping, it is only necessary to perform independent amplitude and/or phase adjustment on the channel where the corresponding band is located according to the required spectral response, and the logic of spectral adjustment is clear.

Claims (9)

1. A spectrum shaping method is characterized in that an original optical signal is divided into a plurality of sub-band signals with different wavelengths by using a wavelength division multiplexing structure, amplitude and/or phase adjustment is carried out on at least one sub-band signal, and then all the sub-band signals are multiplexed and output by using the same wavelength division multiplexing structure to obtain a spectrum shaped optical signal.

2. The method for spectral shaping according to claim 1, wherein said wavelength division multiplexing structure is one of the following structures: cascaded micro-ring filters, cascaded reverse directional couplers, arrayed waveguide gratings, echelle diffraction gratings, MZI lattice filters.

3. The method of spectral shaping according to claim 1, wherein said amplitude adjustment is performed using a mach-zehnder interferometer, or an electro-absorption modulator, or a micro-ring modulator.

4. The method for spectral shaping according to claim 1, wherein said phase adjustment is performed using a thermally or electrically adjusted phase shifter.

5. A spectral shaping device, comprising:

a first wavelength division multiplexing structure for dividing an original optical signal into a plurality of sub-band signals of different wavelengths;

the amplitude and phase adjusting module is used for adjusting the amplitude and/or the phase of at least one subband signal;

and the second wavelength division multiplexing structure is the same as the first wavelength division multiplexing structure and is used for multiplexing and outputting all the sub-band signals to obtain the optical signals after spectral shaping.

6. The spectral shaping device of claim 5 wherein the first wavelength division multiplexing structure and the second wavelength division multiplexing structure are one of: cascaded micro-ring filters, cascaded backward directional couplers, arrayed waveguide gratings, echelle diffraction gratings, MZI lattice filters.

7. The spectral shaping device of claim 5 wherein the amplitude and phase adjustment module uses a Mach-Zehnder interferometer, or an electro-absorption modulator, or a micro-ring modulator to perform the amplitude adjustment.

8. The spectral shaping device of claim 5 wherein the amplitude and phase adjustment module uses thermally or electrically adjusted phase shifters to perform the phase adjustment.

9. The spectral shaping device of claim 5 wherein the spectral shaping device is an optically integrated component.

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