Title :
Highly Linear Coherent Receiver With Feedback
Author :
Chou, Hsu-Feng ; Ramaswamy, Anand ; Zibar, Darko ; Johansson, Leif A. ; Bowers, John E. ; Rodwell, Mark ; Coldren, Larry A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA
fDate :
6/15/2007 12:00:00 AM
Abstract :
We propose and demonstrate a novel coherent receiver with feedback for high-linearity analog photonic links. In the proposed feedback receiver, a local phase modulator tracks the phase change of the signal and reduces the effective swing across the phase demodulator without reducing the transmitted signal. The signal-to-noise-ratio is thus maintained while linearity is improved. Up to 20-dB improvement in spur-free dynamic range (SFDR) is achieved experimentally. At 3.13 mA of average photocurrent per photodiode, the measured SFDR is 124.3 dBmiddotHz2/3, which corresponds to an SFDR of 131.5 dBmiddotHz2/3 when the link is shot-noise-limited
Keywords :
optical feedback; optical fibre communication; optical modulation; optical receivers; optical tracking; phase modulation; photoconductivity; 3.13 mA; coherent receiver; feedback receiver; high-linearity analog photonic links; highly linear receiver; local phase modulator; optical tracking; phase demodulator; photocurrent; photodiode; shot-noise-limited link; signal transmission; signal-to-noise ratio; spur-free dynamic range; Demodulation; Intensity modulation; Linearity; Optical distortion; Optical feedback; Optical interferometry; Optical modulation; Optical receivers; Optical transmitters; Phase modulation; Analog links; coherent communication; feedback; microwave photonics; phase-modulation;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.898811
