A two-channel optical downconverter for phase detection

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...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 1998-11, Vol.46 (11), p.1784-1787
Main Authors: Biernacki, P.D., Nichols, L.T., Enders, D.G., Williams, K.J., Esman, R.D.
Format: Article
Language:English
Subjects:
Erbium-doped fiber amplifier
Noise cancellation
Optical interferometry
Optical modulation
Optical noise
Optical sensors
Phase detection
Phase shift keying
Preamplifiers
Radio frequency
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Summary: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 /spl plusmn/2/spl deg/ 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.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.734580