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 $\pi /2$. This was confirmed experimentally with an SHS that had 32 interleaved Mach–Zehnder interferometers and whose free spectral range was $625\mathrm{GHz}$. The phase shifts ranged from 0.71 to $2.2\mathrm{rad}$ against the target of $\pi /2\mathrm{rad}$.

© 2011 Optical Society of America

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