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Comb spectrum generation device and method based on double spectrum line cyclic frequency shift mode

A comb-like spectrum generator and comb-like spectrum technology, which is applied in the direction of phonon exciters, lasers, laser components, etc., can solve the problem that the mode-locking method is not suitable, and the comb-like spectrum generator is difficult to meet the requirements of stability, flatness, and simple structure. And other issues

Inactive Publication Date: 2013-02-27
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing comb spectrum generator technology is difficult to meet key requirements such as stability, flatness, and simple structure, and there are still many problems to be solved
The mode-locking method is not suitable for commercial and practical comb spectrum generators at all.

Method used

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  • Comb spectrum generation device and method based on double spectrum line cyclic frequency shift mode
  • Comb spectrum generation device and method based on double spectrum line cyclic frequency shift mode
  • Comb spectrum generation device and method based on double spectrum line cyclic frequency shift mode

Examples

Experimental program
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Effect test

Embodiment 1

[0042] see figure 1 , a comb spectrum generator based on a dual spectral line cyclic frequency shifting method, including an external cavity laser (3), a quadruple frequency system, a cyclic frequency shifting loop system, a polarization controller (9) and a 3dB coupler (4 ). It is characterized in that: the external cavity laser (3) is connected to the quadrupling frequency generating dual spectral line system, the quadrupling frequency system is a cascaded two-electrode Mach-Zehnder modulator (1), and its structure is : The output light of the external cavity laser (ECL) (3) enters the cascaded two-electrode Mach-Zehnder modulator (1), and a two-electrode Mach-Zehnder above the cascaded two-electrode Mach-Zehnder modulator (1) The RF electrode on one arm of the modulator (1') inputs the cosine radio frequency signal output by the cosine microwave signal source (1-1), and grounds the DC electrode on that arm; the two-electrode Mach-Zehnder modulator ( 1') The RF electrode i...

Embodiment 2

[0044] This comb spectrum generation method based on the cyclic frequency shifting method of two spectral lines is generated by using the above-mentioned generator, and is characterized in that: on the basis of cyclic frequency shifting based on a cyclic spectral line, the four-fold frequency is modulated by IQ method, firstly generate two related spectral lines, through a 3dB coupler (4), a cascaded two-electrode Mach-Zehnder modulator (2), a semiconductor amplifier (5), an optical filter (6) and a polarization controller In the cyclic frequency shifting loop system composed of (9), the number of elements of the comb spectrum is determined by the bandwidth of the optical filter (6). When the frequency of the comb spectrum exceeds the passband of the optical filter (6), it will no longer A comb spectrum with new frequency components is generated.

Embodiment 3

[0046] The implementation example is a 16-way comb spectrum generator and method applied to 12.5GHz spacing:

[0047] Such as figure 1 , the generator is: an external cavity laser (ECL) (3) is connected with a quadrupling frequency generating dual spectral line system, the quadrupling frequency system is a two-electrode Mach-Zehnder modulator (1), its structure is: The output light of the cavity laser (ECL) (3) enters the cascaded two-electrode Mach-Zehnder modulator (1), where the upper one of the cascaded two-electrode Mach-Zehnder modulator (1) is modulated The RF electrode on one arm of the device (1') inputs the 3.125GHz cosine radio frequency signal output by the cosine microwave signal source (1-1), and grounds the DC electrode on that arm; cascaded two-electrode Mach-Zehnder The RF electrode input on the other arm of the two-electrode Mach-Zehnder modulator (1') above the modulator (1) is output by a cosine microwave signal source and passed through The phase shifte...

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Abstract

The invention relates to a comb spectrum generation device and a method based on a double spectrum line cyclic frequency shift mode. The device comprises a quadruplicated frequency system and a cyclic frequency shift loop, wherein the quadruplicated frequency system comprises a cascaded dual-electrode Mach-Zehnder modulator, a cosine microwave signal source, a phase shifter and the phase shifter; and the cyclic frequency shift loop comprises a 3dB coupler, a polarization controller (PC), the cascaded dual-electrode Mach-Zehnder modulator, the cosine microwave signal source, the phase shifter, the phase shifter, a semiconductor optical amplifier (SOA), an optical filter, an adjustable delay line, a direct-current bias power supply and an optical fiber which is random in length but short as much as possible. The method comprises the steps as follows: firstly, generating two flat spectrums with an interval of 12.5 GHz through the quadruplicated frequency system; secondly, transmitting the spectrums into the loop for cyclic frequency shift; thirdly, carrying out down-conversion on every two spectrum lines through the loop, circulating in sequence, and compensating power through the SOA; and lastly, filtering out 16 required flat spectrum lines through the optical filter.

Description

technical field [0001] The present invention relates to a comb spectrum generator and method based on a double spectral line cyclic frequency shifting method, which overcomes the system stability, complexity and reliability of the existing comb spectrum generation technology in order to generate a flat comb spectrum. At the same time, it also alleviates the influence of the amplifier spontaneous noise interference (ASE) on the spectral line in the cyclic frequency shifting mode. technical background [0002] International research on comb spectrum generators began in the 1990s, but the progress was very slow, and there were few solutions suitable for real applications. There are currently only the following methods to implement a comb generator with a flat comb spectrum: [0003] 1) Optical method: This method uses a mode-locked laser to process each side mode produced by modulation. Due to the simplicity of the principle, since the 1990s, research on comb spectrum genera...

Claims

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Application Information

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IPC IPC(8): H04B10/548H01S3/10
Inventor 宋英雄李海宁姜鹏林如俭张林李迎春陈健
Owner SHANGHAI UNIV
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