Spectrodetector: Novel Monolithic Wavelength Meter and Photodetector
Recently, we have introduced and demonstrated a novel approach using the ratio of two back-to-back detectors with a wavelength dependent reflector (Distributed Bragg Reflector, DBR) in between.5 The DBR is designed to have a weak wavelength-dependent reflectance which provides the necessary spectral dependent ratio for the two detectors. This ratio has a one-to-one correspondence with the signal wavelength, and thus can be used as a wavelength meter. Each photodetector can still be used as a receiver for data in addition to the wavelength reading.
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