OPTICAL TRANSMITTER AND CONTROL METHOD

摘要

An optical transmitter has an array of laser diodes, which output optical signals from a forward end, and controls the power of the optical signals. The optical transmitter has photodiodes detecting the optical power of optical signals from a reverse end and a LD-DRV unit that supplies to the laser diodes, bias current amplitude modulated to a predetermined frequency that differs from that of the drive signal of the laser diodes. The optical transmitter has a frequency analyzing unit that separates a signal detected by a photodiode, into an optical signal component from a target laser diode and crosstalk optical signal components received from other laser diodes; and a control unit that computes for each detected signal, a ratio of the crosstalk optical signal components to the optical signal component, and performs based on the ratio, a computation to remove the crosstalk optical signal components from the detected signal.

主权项

1. An optical transmitter in which a plurality of laser diodes that output optical signals from a forward end is disposed and for which power of the optical signals is controlled, the optical transmitter comprising:
a plurality of light receiving devices configured to detect optical power of optical signals output from a back end of the plurality of laser diodes; an LD driving circuit configured to supply to the plurality of laser diodes, bias current that has been amplitude modulated to a predetermined frequency that differs from that of a drive signal of the plurality of laser diodes; an analyzing circuit configured to separate a signal detected by a light receiving device among the plurality of light receiving devices, into a target optical signal component from a target laser diode among the plurality of laser diodes, and crosstalk optical signals received from adjacent laser diodes among the plurality of laser diodes; and a control circuit configured to compute for the signal detected by each light receiving device among the plurality of light receiving devices, a ratio of the crosstalk optical signals to the target optical signal component, and perform based on the ratio, a computation to remove the crosstalk optical components from the detected signal.