Title :
Reduced loss microwave fiber-optic links by intracavity modulation and carrier suppression
Author :
Glassner, David S. ; Frankel, Michael Y. ; Esman, Ronald D.
Author_Institution :
Lab. for Phys. Sci., College Park, MD., USA
fDate :
3/1/1997 12:00:00 AM
Abstract :
Fiber-optic links are limited by the large Vπ of commercial modulators and by nonlinearities in the photodiodes used to demodulate the RF signals. Intracavity modulation and carrier suppression is shown to enhance the received microwave power in a fiber-optic link for a given optical power at a receiver. The carrier wavelength is automatically locked to the intracavity reflective notch filter that suppresses the carrier relative to the modulation sidebands. Link loss reductions exceeding 10 db were measured for frequencies from 1 to 25 GHz. Harmonic distortions can be decreased by combining this technique with above-quadrature biasing
Keywords :
microwave links; optical fibre communication; optical fibre losses; optical modulation; 1 to 25 GHz; above-quadrature biasing; carrier suppression; harmonic distortion; intracavity modulation; intracavity reflective notch filter; link loss reductions; microwave fiber-optic links; microwave power; reduced loss links; Distortion measurement; Microwave filters; Optical distortion; Optical fiber filters; Optical filters; Optical losses; Optical modulation; Optical receivers; Photodiodes; Power harmonic filters;
Journal_Title :
Microwave and Guided Wave Letters, IEEE
