High-lane count optical transceiver with built-in self test
AssigneeJuniper Networks, Inc.
InventorsJohn Parker, John Garcia, Brandon Gomez, Molly Piels, Anand Ramaswamy
Life of this patent
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Abstract
An optical device such as an optical transceiver can include a cascaded built-in self-test structure that can be configured in testing mode using an active power mode and can sufficiently attenuate light away from a loopback path in an inactive power mode. The optical device can include a wafer top emitter that can be used to tune a light source for testing and calibration of optical components while the built-in self-test structure is in active mode.
Claims20
A method for testing an optical transceiver comprising a transmitter and a receiver, the method comprising:
- transmitting light from the transmitter to the receiver along a loopback path in the optical transceiver in a loopback mode, the loopback mode being enabled by an integrated loopback switch comprising one or more filters that switch between an inactive power mode to an active power mode to provide light along the loopback path, each of the one or more filters comprising a power splitter that passively directs light away from the loopback path in the inactive power mode and actively directs light towards the loopback path in the active power mode;
- testing one or more optical components in the optical transceiver using light propagating along the loopback path in loopback mode;
- setting the optical transceiver in mission mode by setting the integrated loopback switch from the active power mode to the inactive power mode, the one or more filters of the integrated loopback switch configured to passively direct light away from the loopback path while in the inactive power mode;
- and
- transmitting, by the transmitter, output light while the optical transceiver is in the mission mode and the one or more filters of the integrated loopback switch are in the inactive power mode.
An optical transceiver comprising:
- an optical transmitter configured to generate modulated light;
- an optical receiver to receive light;
- and
- an integrated loopback switch coupled to the optical transmitter and the optical receiver to couple light along a loopback path from the optical transmitter to the optical receiver, the integrated loopback switch comprising one or more filters, each of the one or more filters comprising a power splitter that passively directs light away from the loopback path in an inactive power mode and actively directs light towards the loopback path in an active power mode.
Dependencies are inferred from the claim text.