A Broadband Linearized Coherent Analog Fiber-Optic Link Employing Dual Parallel Mach-Zehnder Modulators

A composite optical transmitter based on dual parallel Mach-Zehnder modulators is proposed to linearize double-sideband suppressed-carrier coherent analog fiber-optic links. The optimization condition for achieving the best spurious-free dynamic range (SFDR) is discussed, with a simple and exact exp...

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Bibliographic Details
Published in:IEEE photonics technology letters 2009-11, Vol.21 (21), p.1627-1629
Main Authors: Guanghao Zhu, Wei Liu, Fetterman, H.R.
Format: Article
Language:English
Subjects:
Analog optical link
Chirp modulation
coherent detection
Decision support systems
Dynamic range
Fiber lasers
intermodulation distortion
linearized modulator
Optical distortion
Optical fiber polarization
Optical modulation
Optical receivers
Optical transmitters
Signal to noise ratio
suppressed carrier
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Summary:A composite optical transmitter based on dual parallel Mach-Zehnder modulators is proposed to linearize double-sideband suppressed-carrier coherent analog fiber-optic links. The optimization condition for achieving the best spurious-free dynamic range (SFDR) is discussed, with a simple and exact expression for the maximized SFDR being derived. Unlike other existing linearization schemes, the proposed technique has the advantages of broadband operation and shot-noise-limited signal-to-noise ratio at the same time. For a lossless link employing a transmitter laser with moderate optical power of 100 mW, a broadband SFDR as high as 144 dB middot Hz 4/5 is theoretically predicted.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2009.2031166