Wavelength control of two-channel DEMUX/MUX in silicon photonics

摘要

Method and devices of controlling wavelengths in two-channel DEMUX/MUX in silicon photonics are provided. The two-channel DEMUX/MUX includes a waveguide-based delay-line-interferometer at least in receiver portion of a two-channel transceiver for DWDM optical transmission loop and is configured to split a light wave with combined two-wavelengths into one light wave with locked one channel wavelength and another light wave with locked another channel wavelength. The waveguide-based delayed-line interferometer (DLI) is characterized by a free-spectral-range configured to be equal to twice of channel spacing. The method includes tuning heater of DLI in receiver of each two-channel transceiver by using either low-frequency dither signals added on MZMs associated with respective two channels as feedback signal or one DFB laser wavelength tapped from an input of transmitter portion at one channel before or after the MZMs as a direct wavelength reference to feed into an output of receiver portion at another channel.

主权项

1. A silicon photonic transceiver system comprising:
a first optical input port for receiving a first optical signal; a second optical input port for receiving a second optical signal; a first modulator coupled to the first optical input port and being configured to modulate the first optical signal at a first wavelength; a second modulator coupled the second optical input port and being configured to modulate the second optical signal at a second wavelength; a combiner being configured to generate a transmission signal using the modulated first optical signal and the modulated second optical signal; a third optical input port for receiving a third optical signal; and a first delay-line-interferometer (DLI) being configured to split the third optical signal into a fourth optical signal and a fifth optical signal, the fourth optical signal being characterized by the first wavelength, the fifth optical signal being characterized by the second wavelength.