Method for generating polarization orthogonal dual-wavelength optical signal with large tuning range for frequency interval, and device thereof

Abstract

Provided are a method for generating polarization orthogonal dual-wavelength optical signals with a large tuning range for a frequency interval, and a device thereof. The method comprises: two parallel double-parallel Mach-zehnder modulators forming an integrated modulator, a Sagnac ring being embedded with a narrow-band fiber bragg grating, under a large-signal modulation mode, one double-parallel Mach-zehnder modulator generating carrier waves and a high-order nonlinear optical edge band, and the other double-parallel Mach-zehnder modulator performing non-microwave local oscillation modulation, two output optical signals being polarized orthogonal coupled, and the polarized orthogonal coupled two paths of optical signals projecting to a same direction, restraining optical carrier, to obtain a high-order dual-wavelength optical edge band, inputting the Sagnac ring which is embedded with the fiber bragg grating and a polarization coupler, using characteristics of reflection of a fiber bragg grating narrow band and transmission of a wide band, to realize wavelength separation, using a characteristic of polarization selection of the polarization coupler, to realize polarization orthogonal coupling of dual-wavelength optical signals, and on the output end of the Sagnac ring, the polarization orthogonal dual-wavelength optical signals are obtained. The method is advantaged by high clock multiplier factor and large tuning range.

Description

technical field [0001] The invention belongs to the technical field of microwave photon signal generation, and in particular relates to a polarization orthogonal dual-wavelength optical signal generation method with a frequency interval and a large tuning range and a device thereof. Background technique [0002] Polarized orthogonal dual-wavelength optical signals refer to two linearly polarized optical signals with different frequencies, strictly coherent phases, and mutually perpendicular polarization directions. This form of optical signal combines wavelength division multiplexing and polarization multiplexing, which can realize parallel processing of signals, improve spectrum utilization, reduce inter-channel interference and optimize system integration. Therefore, in microwave photon filtering, antenna beamforming, Microwave pulse shaping and non-destructive detection and imaging have broad prospects. In the microwave photonic signal processing system based on polariza...

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Problems solved by technology

[0004] However, the above-mentioned schemes have certain limitations

1) The frequency interval tuning range of the optical signal generated in the scheme is limited by the frequency of the microwave local oscillator. On the other hand, there is no integrated product for the modulator of the parallel structure in the scheme, and the use of separate devices will affect the stability of the system; 2) The frequency interval of the optical signal generated in the scheme is limited by the microwave local oscillator frequency and the response spectrum of PM-FBG, so the frequency interval is small and the tuning performance is poor; 3) The frequency interval is improved by quadruple frequency processing in the scheme, but the frequency tuning performance Still limited by the response spectrum of PM-FBG

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