Optical communication reception system

摘要

A system configured to maintain a consistent local-oscillator-power-to-primary-signal-power ratio (LO/SIG ratio). The system may be configured to: receive the voltages for a plurality of optical signal components split from a combined SIG and LO signal; determine individual factors for the plurality of optical signal components; average the individual factors; determine whether the averaged output is less than an existing minimum reference value for a variable optical attenuator; determine whether the averaged output is greater than an existing maximum reference value for the variable optical attenuator; change the existing minimum reference value to a new value associated with the averaged output, due to determining that the averaged output is less than the existing minimum reference value; change the existing maximum reference value to a new value associated with the averaged output, due to determining that the averaged output is greater than the existing maximum reference value; and change a new value associated with the averaged output to be transmitted to the variable optical attenuator.

主权项

1. A method, comprising:
receiving an optical signal, via an attenuator; receiving a local oscillator signal from a local oscillator source; identifying voltages for optical signal components of the optical signal and of the local oscillator signal, wherein the voltages for the optical signal components are analog signal components; identifying voltages for additional signal components associated with optical noise and electrical noise; determining a ratio representing a relationship between signal power of the optical signal and signal power of the local oscillator signal based on the voltages for the analog signal components and the additional signal components; and transmitting a control signal to the attenuator, the control signal configured to control the optical signal to maintain the ratio.