Tunable optical frequency comb generation device and method based on EAM and pulse signals

Abstract

The invention discloses a tunable optical frequency comb generating device based on EAM and pulse signals. A bit sequence generator controls a pulse generator to generate periodic pulse signals; the periodic pulse signals are amplified by an electric amplifier and then shunted by an electric power divider; finally, the signals pass through a first adjustable attenuator and a second adjustable attenuator and then reach an electric absorption modulator a and an electric absorption modulator b respectively to be subjected to driving control; the continuous light source outputs single-wavelength continuous light into the electric absorption modulator a to generate a comb-shaped spectrum, then the comb-shaped spectrum is modulated by the electric absorption modulator b to obtain an optical frequency comb, and the optical frequency comb is input into the spectrograph to be analyzed. According to the tunable optical frequency comb generation device and method based on the EAM and the pulse signals, the optical frequency comb which is continuous in frequency spectrum, high in power flatness, wide in coverage spectrum range, multiple in frequency component and tunable in frequency intervalcan be generated.

Description

technical field [0001] The invention relates to a tunable optical frequency comb generation device and method based on EAM and pulse signals, and belongs to the field of optics. Background technique [0002] At present, the WDM system has played a huge role in the optical communication backbone network. According to the recommendation of the ITU-T standard, the WDM system needs a large number of light sources with equal power and wide channel intervals as the carrier wave, so as to realize the modulation and communication of information in the subsequent optical communication process. Transmission, but the cost of multi-wavelength lasers or optical transmission modules is high, and the designability is limited, which is one of the bottlenecks that WDM systems face at the optical transmission end. The use of optical frequency combs can reduce or even replace the use of multi-wavelength lasers, reduce the cost of optical communication systems, and has the advantages of channel...

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Problems solved by technology

[0006] However, among the existing schemes for generating optical frequency combs based on modulators, there has never been a scheme for generating ideal optical combs based on a single EAM

Although there is a scheme based on a single RF signal and a single EAM to generate a dual optical comb, the frequency spectrum of the optical frequency comb modulated by a single EAM in the scheme is discontinuous, and an optical filter is required to obtain a dual optical comb

In addition, in the scheme of generating optical frequency comb based on the modulator in the prior art, it is difficult to produce an optical frequency comb with high power flatness, wide spectral coverage, many frequency components and tunable frequency interval

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