Circulating frequency shifting comb spectrum generating system based on intensity modulation and application method of circulating frequency shifting comb spectrum generating system

Abstract

The invention relates to a circulating frequency shifting comb spectrum generating system based on intensity modulation and an application method of the circulating frequency shifting comb spectrum generating system. The circulating frequency shifting comb spectrum generating system comprises a semiconductor laser unit, an intensity modulator, an optical coupler, a polarization controller, an IQ modulator, a light frequency spectrum analysis meter, two cosine microwave signal sources, two phase shifters, a light amplifier, a band-pass filter, a light-adjustable delay line, four direct-current bias power supplies and an optical fiber which is as short as possible with a random length. According to the circulating frequency shifting comb spectrum generating system, the semiconductor laser unit generates seed light through the intensity modulator, the coupled seed light is modulated by the IQ modulator, a loop continuously generates spectral lines of novel frequency components, and a smooth comb spectrum can be obtained through reasonable gain conditions of the light amplifier and selection of band widths of the band-pass filter. One seed light source is utilized in the circulating frequency shifting comb spectrum generating system for expansion, and therefore circulation frequency of the loop is reduced, and the smooth and stable comb spectrum which is needed is obtained under the condition of low noise accumulation.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to an intensity modulation-based cyclic frequency-shifting comb spectrum generation system and an application method thereof. Background technique [0002] OFDM-PON (Orthogonal Frequency Division Multiplexing Positive Optical Network) is based on optical OFDM technology. It can realize high-speed, flexible and free optical access by utilizing the characteristics of optical OFDM spectrum utilization, good anti-dispersion performance, and free carrier allocation. Compared with the existing optical access technology, OFDM-PON can not only increase the bandwidth available to users, avoid technical difficulties in receiving high-speed burst signals, but also complete the resource scheduling of different services at a very fine granularity to achieve flexible optical access. The existing OFDM-PON network is mostly based on point-to-point single-wavelength communication, and the transm...

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Problems solved by technology

However, it is basically based on the realization of the ideal environment in the laboratory. From the perspective of the system structure, the system is complex and the device is expensive, and it is difficult to achieve commercialization and practicality; 2) Direct generation method based on modulator: in the international There are few direct generation schemes that can generate 16 or more flat comb-like spectra. This scheme requires a huge RF drive power, the work efficiency is not high, and it is difficult to be practically applied; 3) Frequency shift generation method: the The scheme was first proposed by the University of Ottawa, Canada, which mainly uses the modulator carrier suppression modulation technology. The system requires two modulators and a bidirectional optical filter. The system structure is also relatively complicated, and it is difficult to be popularized in practical applications.

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 urgently

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