Abstract

We report that a spectrum can be retrieved with a planar waveguide spatial heterodyne spectrometer (SHS) incorporating an active phase-shift scheme, where the phase shifts are distributed around π/2. This was confirmed experimentally with an SHS that had 32 interleaved Mach–Zehnder interferometers and whose free spectral range was 625GHz. The phase shifts ranged from 0.71 to 2.2rad against the target of π/2rad.

© 2011 Optical Society of America

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