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System and method for multi-wavelength optical signal detection

  • US 9,696,411 B2
  • Filed: 01/08/2015
  • Issued: 07/04/2017
  • Est. Priority Date: 01/27/2014
  • Status: Active Grant
First Claim
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1. A multi-wavelength optical signal detector, comprising:

  • photodiode configured to output charge flux in response to a multi-wavelength optical signal incident on the photodiode;

    a current-to-charge converter connected to the photodiode and configured to receive the charge flux from the photodiode and output a first voltage proportional to a charge accumulated;

    a delta-sigma modulator (DSM) connected to the current-to-charge converter and configured to receive the first voltage from the current-to-charge converter and output pulses based at least in part on the first voltage; and

    a pulse counter connected to the DSM and configured to receive the pulses from the DSM and output a digital signal based at least in part on the pulses.

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