Optical apparatus and use method thereof for passive optical network system

摘要

An optical apparatus receives an upward signal light from a plurality of subscriber units, where the upward signal light is composed of a plurality of time slots corresponding to the plurality of optical subscriber units. The optical apparatus includes a driving unit configured to determine a respective required gain for light from each of the plurality of optical subscriber units, an amplifying section configured to amplify the upward signal light with the required gain corresponding to the time slots of the upward signal light, and a receiver configured to receive the amplified upward signal light.

主权项

1. An optical apparatus, comprising:
a splitter that receives a time-division-multiplexed signal light multiplexed from a plurality of transmitting devices; a plurality of semiconductor amplifiers coupled to the splitter, each of the semiconductor amplifiers corresponding to each of a plurality of time slots along a time axis of the signal light; a multiplexer coupled to the plurality of semiconductor amplifiers, the multiplexer being configured to output a branched time-division-multiplexed signal light amplified by the plurality of semiconductor amplifiers that each correspondingly input each of the signal lights branched from the splitter; a receiver connected to the multiplexer; and a driving circuit connected to the plurality of semiconductor amplifiers, wherein the splitter is configured:
to receive the signal light divided into the plurality of time slots, each of the plurality of time slots being respectively assigned to any one of the plurality of transmitting devices,to branch the signal light to a plurality of signal lights, andto input the plurality of signal lights to the plurality of semiconductor amplifiers one to one, the driving circuit configured:
to supply, for each of the plurality of time slots, a driving current to one of the plurality of semiconductor amplifiers that corresponds to a time slot, each of the plurality of semiconductor amplifiers configured:
to generate, when supplied with the driving current, an amplified branched signal light by amplifying one of the plurality of signal lights inputted with a constant gain, the constant gain being constant along a time axis and corresponding to one of the plurality of transmission devices, the constant gain being predetermined in accordance with the power dynamic range of the receiver and an optical transmission loss between the optical apparatus and the one of the plurality of transmission devices,to input the amplified branched signal light to the multiplexer when supplied with the driving current, and to input no branched signal light to the multiplexer when not supplied with the driving current, and the multiplexer configured to generate a composite signal light by composing each amplified signal, and to input the composite signal to the receiver.