RF phase shifter using a distributed feedback laser in microwave transport systems

Abstract

This work experimentally demonstrates the efficacy of a radio-frequency phase shifter using a distributed feedback laser in a microwave transport system. Phase shifts of about 101 degrees are obtained at 8.75 GHz. The proposed phase shifter can amplify microwave signals and thereby improve transmission performance. Additionally, a similar single sideband modulation can be generated by the phase shifter. Experimental results indicate that the proposed phase shifter can be used in future long-distance microwave transport systems and all optical inverters.

Optically controllable all-fiber based radio-frequency phase-shifter

“…An RF phase-shifter is conventionally fabricated with an incorporated transmission line whose electric permittivity or electric length, can be varied. Recently, the photonic elements in RF phase-shifters have attracted several attention owing to their numerous advantages including lightness of weight, immunity to electromagnetic interference, excellent isolation, optical distribution capacity, and smallness [1][2][3][4]. Additionally, in-line components for fiber-optic systems that do not require interruption of the fiber core are appealing because they are mechanically stable and have a low insertion loss [5].…”

A distributed feedback laser for a tunable microwave photonic filter

“…Extensively adopted in optical communication systems, DFB lasers are characterized by narrow linewidth, high optical power, and significant reliability [20][21][22][23][24][25][26]. This work describes an adjustable microwave photonic filter, using a multi-wavelength laser source.…”

Fast and slow light property improvement in erbium-doped amplifier

“…'Fast light' and 'slow light' have recently attracted substantial interest because they have important applications, as in optical signal processing, optical buffers, optical communication, optical data synchronization, optical memories, and phasearray antenna systems [1][2][3][4][5][6][7][8][9]. In recent years, slow light has been demonstrated in electromagnetically induced transparency, coherent population oscillations, and stimulated Brillouin and Raman scattering.…”