Title :
A two-channel optical downconverter for phase detection
Author :
Biernacki, Paul D. ; Nichols, Lee T. ; Enders, D.G. ; Williams, Keith J. ; Esman, Ronald D.
Author_Institution :
Naval Res. Lab., Washington, DC, USA
fDate :
11/1/1998 12:00:00 AM
Abstract :
Experimental results for a two-channel optical downconverter link operating from 2 to 18 GHz are presented. Using low-noise preamplifiers results in a noise figure (NF) of 8.5-14 dB over the frequency range of 2-18 GHz. For the first time, relative phase measurements between optically downconverted signals have been performed. An in-phase/quadrature phase-measurement technique indicates a phase precision of ±2° with as little as -60 dBm radio frequency (RF) received power. Comparing the optical microwave downconverter to an electrical microwave downconverter in terms of phase detection reveals similar performance between the two systems
Keywords :
demodulation; electro-optical modulation; heterodyne detection; microwave links; microwave photonics; optical communication equipment; optical fibre networks; optical frequency conversion; phase detectors; phase measurement; preamplifiers; 2 to 18 GHz; 8.5 to 14 dB; demodulation; fiber optic link; in-phase/quadrature phase-measurement technique; low-noise preamplifiers; optical microwave down-converter; phase detection; photonics; relative phase measurements; remoting; two-channel optical down-converter; Erbium-doped fiber amplifier; Noise cancellation; Optical interferometry; Optical modulation; Optical noise; Optical sensors; Phase detection; Phase shift keying; Preamplifiers; Radio frequency;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
