Coherent techniques for phase demodulation include utilization of optical local oscillators.The use of an Mach‐Zehnder interferometer (MZI) in a phase‐modulated link complicates the treatment of laser noise. Linearization techniques for phase modulation employing multiple MZIs can be analogous to methods employing multiple Mach‐Zehnder modulators (MZMs). A phase‐modulated link can be linearized by employing two MZIs with unmatched differential delays. This chapter focuses on optical phase modulation that is converted to intensity modulation via an MZI for detection with a photodiode. Such interferometric approaches were among the first techniques demonstrated for decoding information contained in the phase of optical fields. Higher order finite impulse response (FIR) filters can provide a more linear response than a single MZI, such as a serial cascade of MZIs. The RF signal can be linearly reconstructed by digitizing and processing the in‐phase and quadrature photocurrents.
External Phase Modulation with Interferometric Detection
FUNDAMENTALS OF MICROWAVE PHOTONICS ; 273-311
2015-02-26
39 pages
Article/Chapter (Book)
Electronic Resource
English
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