Comparison of series and parallel optical modulators for microwave down-conversion

Photonic down-conversion of microwave signals using a pair of broad-band optical modulators is investigated theoretically and experimentally for cascaded and parallel modulator topologies. Improvement of 14 dB, roughly equal to the composite modulator insertion loss, was measured. Low-biasing and ba...

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Bibliographic Details
Published in:IEEE photonics technology letters 1998-11, Vol.10 (11), p.1623-1625
Main Authors: Gallo, J.T., Godshall, J.K.
Format: Article
Language:English
Subjects:
Amplitude modulation
Fiber lasers
Frequency conversion
Optical distortion
Optical fiber losses
Optical modulation
Optical saturation
Photodetectors
Quantum cascade lasers
Topology
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Summary:Photonic down-conversion of microwave signals using a pair of broad-band optical modulators is investigated theoretically and experimentally for cascaded and parallel modulator topologies. Improvement of 14 dB, roughly equal to the composite modulator insertion loss, was measured. Low-biasing and balanced detection in parallel links allows a further improvement of over 20 dB through increased laser power without detector saturation.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.726770