Frequency response balancer by using light carrier Brillouin treatment

Abstract

The invention relates to a frequency response balancer by using light carrier Brillouin treatment. An existing phase modulation link can not acquire flat frequency response. In the balancer, a laser device is connected with an input end of a photo-coupler; an output end of the photo-coupler is optically connected with one end of a first polarization controller (PC); the other end of the first PC is optically connected with an optical input end of an electro-optical phase modulator; an output end of the electro-optical phase modulator is optically connected with one end of a single mode fiber (SMF); the other end of the SMF is optically connected with an interface 2 of a circulator; the other output end of the photo-coupler is optically connected with one end of a second PC; the other end of the second PC is optically connected with an optical input end of a modulator; an output end of the modulator is optically connected with an input end of an optical parametric erbium amplifier; an output end of the optical parametric erbium amplifier is optically connected with an interface 1 of the circulator; and an interface 3 of the circulator is optically connected with an input end of an optical high-speed detector. The frequency response balancer is used to realize effective transformation from the phase to the strength, and acquire the adjustable frequency response balance of bandwidth.

Description

technical field [0001] The invention relates to the field of radio frequency optical fiber communication, in particular to a frequency response equalization device using optical carrier Brillouin processing. Background technique [0002] The use of optical fiber links to transmit microwave signals between the central control station and distributed base stations has the advantages of high bandwidth, light weight, small size, and strong anti-electromagnetic interference capabilities. It is becoming an ultra-broadband high-speed mobile communication, ultra-broadband wireless access, etc. Systematic research hotspots. Usually we use two kinds of modulators to modulate the microwave signal onto the optical carrier: intensity modulator and phase modulator. The linear modulation area of ​​the intensity modulator is narrow, the modulation depth of the optical carrier is small, and the bias circuit is required to provide a DC bias voltage. In actual work, the DC bias point will be...

AI Technical Summary

Problems solved by technology

However, in the phase modulation link, although the fiber dispersion effect can break the phase difference of the ±1st order sideband p of the phase modulation signal, the sideband phase difference that can be introduced by the fiber dispersion effect is related to the frequency of the modulation signal, the type of fiber and the length of the fiber , therefore, in the case of fixed fiber and fiber length, the phase-modulated link using the fiber dispersion effect to achieve phase-to-intensity conversion cannot obtain a flat frequency response

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