Abstract
A technique is presented for measuring the in-phase and quadrature
components of a modulated optical signal, using standard electrical and
optical components and a high-bandwidth equivalent-time sampling
oscilloscope. The measurement setup consists of an interferometer, optical
mixer, and sampling oscilloscope with two low-speed sampling modules (50
kHz) and two high-speed optical sampling modules (65 GHz). The simultaneous
measurement of four de-skewed signals allows for the separate determination
of the phase noise, amplitude modulation, and phase modulation. From these
results, the complete trajectory in time of the complex signal is
constructed.
© 2009 IEEE
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