Circuit for monitoring the receiver of an optical transceiver and the method for monitoring burst mode optical power thereof

摘要

A circuit for monitoring an optical receiver or transceiver, architectures, circuits, and systems including the same, and a method for monitoring received optical power are disclosed. The receiver monitoring circuit comprises an avalanche photodiode (APD), a microprocessor, and first and second transresistance amplifiers. The microprocessor is configured to supply bias voltage to the APD. Photocurrent produced by the APD is supplied to the first and second transresistance amplifiers, and then the microprocessor captures optical power from the voltage signal of the first and second transresistance amplifiers. By algorithms and microprogramming systems, the circuit for monitoring the optical receiver and method of monitoring optical power enables precision compensation for monitoring burst mode optical power in commercial temperature ranges and powers, and also can be applied to high precision digital monitoring of optical transceivers in a PON system in the commercial temperature range with error values within ±1 dB.

主权项

1. A circuit for monitoring an optical receiver, wherein said circuit comprises:
an avalanche photodiode (APD); a multipath constant flow source configured to convert photocurrent from the APD into first and second currents, the second current having a value different from that of the first current; a first amplifier having a first gain, configured to receive the first current from the APD and provide a first voltage signal; a second amplifier having a second gain different from the first gain, configured to receive the second current from the APD and provide a second voltage signal; a microprocessor configured to (i) supply a bias voltage to the APD and (ii) determine an optical power from the first and second voltage signals; and a digital to analog converter (DAC) that receives an output from the microprocessor and provides a voltage to the multipath constant flow source.