Broadband class-AB microwave-photonic link using polarization modulation

TitleBroadband class-AB microwave-photonic link using polarization modulation
Publication TypeJournal Article
Year of Publication2006
AuthorsBull, J. D., T. E. Darcie, J. Zhang, H. Kato, and N. A. F. Jaeger
JournalPhotonics Technology Letters, IEEE
Pagination1073 -1075
Date Publishedmay.
Keywords2 GHz, 4 GHz, AlGaAs-GaAs, AlGaAs-GaAs electrooptic mode-converter, aluminium compounds, carrier-related noise, class-AB microwave-photonic link, electro-optical devices, electrooptic transfer functions, gallium arsenide, III-V semiconductors, light polarisation, Mach-Zehnder interferometers, microwave photonics, optical carrier power, optical modulation, optical transfer function, polarization modulation, quadrature-biased Mach-Zehnder modulator, spur-free dynamic range

A novel broadband class-AB (CAB) microwave-photonic link is demonstrated using an AlGaAs-GaAs electrooptic mode-converter-based polarization modulator (PolM). The polarization-modulated signal is split into two paths, each independently optically biased to provide two electrooptic transfer functions operating close to, but on opposing sides of, their nulls. Experimental results at 2 and 4 GHz confirm that detection of the transfer functions in a differential detector provides excellent cancellation of second-order distortion and recreates the same third-order distortion as a quadrature-biased Mach-Zehnder modulator. Biasing the operating points near the null reduces optical carrier power, and hence, carrier-related noise, thereby increasing achievable spur-free dynamic range. The use of the PolM allows the CAB link to be implemented with a single modulator, reducing the matching requirements of dual modulator schemes and allowing third-order distortion-limited broadband operation.


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