High Optical Power Handling, 1.2 to 2.2 Micron Wavelength, Uncooled InGaAs Photodiodes up to 6 GHz Bandwidth for Coherent Spectroscopy (2018)


Abhay Joshi and Shubhashish Datta
Discovery Semiconductors, Inc. 119 Silvia Street, Ewing, NJ 08628, USA


We report an uncooled, lattice-mismatched InGaAs photodiode for coherent spectroscopy that demonstrates linear performance up to a photocurrent of 70 mA and has a broad spectral coverage from 1.2 to 2.2 micron wavelength. The fiber-packaged photodiode module can deliver up to +13 dBm of continuous-wave RF output power, i.e. 2.8 V peak-to-peak amplitude, and does not require any further RF amplification to maximize the effective number of bits (ENOBs) for the backend digitizers. These photodiodes have a -3 dB bandwidth of 6 GHz and can coherently detect up to 6 spectral lines within a 1 ns temporal window.

* Proc. SPIE 10528, Optical Components and Materials XV, 105280Y (22 February 2018); doi: 10.1117/12.2292979
Event: SPIE OPTO, 2018, San Francisco, California, United States


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