Method and system for an optoelectronic built-in self-test system for silicon photonics optical transceivers
First Claim
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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Accused Products
Abstract
Methods and systems for an optoelectronic built-in self-test (BIST) system for silicon photonics optical transceivers are disclosed and may include, in an optoelectronic transceiver having a transmit (Tx) path and a receive (Rx) path, where the Rx path includes a main Rx path and a BIST loopback path: generating a pseudo-random bit sequence (PRBS) signal, generating an optical signal in the Tx path by applying the PRBS signal to a modulator, communicating the optical signal to the BIST loopback path and converting to an electrical signal utilizing a photodetector, the photodetector being a replica of a photodetector in the main Rx path, and assessing the performance of the Tx and Rx paths by extracting a PRBS signal from the electrical signal. The transceiver may be a single complementary-metal oxide semiconductor (CMOS) die or in two CMOS die, where a first comprises electronic devices and a second comprises optical devices.
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Citations
23 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for communication, the system comprising:
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, the optoelectronic transceiver being operable to; generate 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; generate an optical signal in the Tx path by applying the multiplexed PRBS signal and input electrical signal to an optical modulator in the optoelectronics die; communicate the optical signal to the built-in self-test loopback path in the optoelectronics die; convert 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, wherein both photodetectors comprise SiGe and are integrated into the optoelectronics die; and extract, in the electronics die, the PRBS signal and the input electrical signal from the electrical signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method for communication, the method comprising:
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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 first electrical signal in the Tx path in at least one of the one or more electronics die; generating a pseudo-random bit sequence (PRBS) signal in the at least one of the one or more electronics die; multiplexing the first electrical signal with the PRBS signal in the at least one of the one or more electronics die; generating a first optical signal in the Tx path by applying the multiplexed electrical and PRBS signals to an optical modulator in the optoelectronics die; receiving a second optical signal in the Rx path and converting to a second electrical signal utilizing a photodetector in the main Rx path; communicating the first optical signal to a portion of the built-in self-test loopback path in the optoelectronics die; converting the first optical signal to a third 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; multiplexing the second and third electrical signals in the Rx path in the at least one of the one or more electronics die; extracting, in the electronics die, the PRBS signal and the first electrical signal from the multiplexed second and third electrical signals; 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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23. A method for 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; 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 PRBS signal and input electrical signal to an optical modulator in the optoelectronics die; communicating the optical signal to a portion of the Rx path in the optoelectronics die; converting the optical signal to an electrical signal in the Rx path utilizing a photodetector in the optoelectronics die; 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.
Specification