Optical receiver, optical transceiver using the same, and control method of reception of optical signals

An optical transceiver comprising:

• an optical receiver;
• and
• an optical transmitter,
• wherein the optical receiver has
• photodetectors each provided on a corresponding channel of multiple channels and configured to detect an optical signal at the corresponding channel,
• a delay adjuster circuit provided before the photodetectors and configured to adjust a delay time of an optical waveform of an incoming signal on at least one channel, and
• a processor that controls the delay time such that a change point of a first optical waveform of a first channel is away from a data decision timing of a second optical waveform of a second channel, using information acquired from an electrical signal produced after photo-detection.

A control method of reception of optical signals, comprising:

• receiving at an optical receiver an optical signal on each of multiple channels;
• detecting the optical signal and producing an electrical signal for each of the multiple channels;
• and
• based upon information acquired from the electrical signal, controlling a delay time of an optical waveform of an incoming signal for each of the multiple channels such that a change point of a first optical waveform of a first channel is away from a data decision timing of a second optical waveform of a second channel.