Broad-Band Fiber Optic Link with a Stand-Alone Remote External Modulator for Antenna Remoting and 5G Wireless Network Applications

Abstract

A broad band fiber optic link with a stand-alone remote external modulator at the transmission terminal and laser source and photo detector at the receiving terminal have been demonstrated. The standard single mode fiber without polarization maintaining was used to deliver an optical radiation to the polarization sensitive lithium niobate external modulator. An original scheme with depolarizing laser sources was used. One component of the linear polarization was used for high frequency modulation and the orthogonal component was converted into electricity and feed the modulator bias control electronic scheme. The using of the balanced detection scheme for the increasing spurious-free dynamic range (SFDR) higher than 110 dB/Hz2/3 was proposed.