Tunable microwave photonic filter based on photoinjection semiconductor laser system

Abstract

The invention discloses a tunable microwave photonic filter based on a photoinjection semiconductor laser system. The tunable microwave photonic filter comprises a master laser, a first polarization controller, a variable optical attenuator, an optical circulator, a slave laser, a second polarization controller, a third polarization controller, a phase modulator, a fourth polarization controller, an opto-isolator, a 3dB optical coupler, a Sagnac loop filter, single mode dispersion fiber, an optical amplifier and a photoelectric detector. By making use of the nonlinear dynamic behavior of light when the light enters the semiconductor laser system, by exciting the single-cycle oscillation effect P1 of the semiconductor lasers to generate similar beam-shaped spectra with variable frequency space, and by adjusting the intensity of injecting the master laser to the slave laser or the off-resonance frequency between the two lasers, the invention realizes the tunable microwave photonic filter with a tunable filtering window and at the same time the reconfigurability and multi-tap structure of the filters are realized.

Description

technical field [0001] The present invention relates to the technical fields of optical communication and wireless communication, in particular to the application of microwave photon filters in radio-on-fiber (RoF) communication systems, that is, a tunable microwave photon filter based on optical injection semiconductor laser systems. Background technique [0002] In recent years, with the rise of communication networks such as broadband wireless access network, UMTS, WLAN, LMDS and WIMAX, in order to reduce the coverage area and increase the communication capacity at the same time, a possible solution technology is RoF communication. In RoF communication, Centralize some signal processing functions originally performed at the base station to the central station for unified processing, thus greatly reducing the cost of the base station. [0003] Because microwave photonic filters have the characteristics of high bandwidth, low loss, and immunity to electromagnetic interferen...

AI Technical Summary

Problems solved by technology

For the realization of multi-tap, tunable light source, laser array or broadband cutting light source are necessary components, and usually need delay components equal to or greater than the number of taps, which are more complicated and costly

[0005] To sum up, to realize microwave photonic bandpass filter, whether it is to realize tunable or multi-tap, the cost of light source will be very high

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