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Method and system for an optoelectronic built-in self-test system for silicon photonics optical transceivers

  • US 10,348,459 B2
  • Filed: 04/25/2018
  • Issued: 07/09/2019
  • Est. Priority Date: 06/26/2014
  • Status: Active Grant
First Claim
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1. A method for optical communication, the method comprising:

  • in an optoelectronic transceiver on an optoelectronics die and one or more electronics die, the transceiver having a transmit (Tx) path and a receive (Rx) path, the Rx path comprising a main Rx path and a built-in self-test loopback path;

    generating a pseudo-random bit sequence (PRBS) signal in at least one of the one or more electronics die;

    multiplexing the PRBS signal with an input electrical signal;

    generating an optical signal in the Tx path by applying the multiplexed input electrical signal and PRBS signal to an optical modulator in the optoelectronics die;

    communicating the optical signal to a portion of the built-in self-test loopback path in the optoelectronics die;

    converting the optical signal to an electrical signal in the Rx path utilizing a loopback photodetector in the built-in self-test loopback path, the loopback photodetector being a replica of a photodetector in the main Rx path;

    extracting, in the electronics die, the PRBS signal and the input electrical signal from the electrical signal; and

    assessing performance of the Tx and Rx paths by reducing an input power of the optical signal in the Tx path while monitoring a bit error rate.

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