Tunable bi-directional transceiver

A tunable bi-directional transceiver comprising:

• an optical waveguide, defined in silicon and integrated on a chip;
• a first filter, defined in silicon and integrated on the chip, optically coupled to the optical waveguide and operable to filter a first optical signal in a first wavelength band propagating downstream in the optical waveguide, wherein a center wavelength of the first wavelength band is tunable;
• a first receiver, integrated on the chip, optically coupled to the first filter to receive the first optical signal;
• a second filter, defined in silicon and integrated on the chip, optically coupled to the optical waveguide and operable to filter a second optical signal in a second wavelength band propagating downstream in the optical waveguide, wherein the second wavelength band is different from the first wavelength band;
• a second receiver, integrated on the chip, optically coupled to the second filter to receive the second optical signal;
• and
• a laser, integrated on the, optically coupled to the optical waveguide and operable to output radiation in a third wavelength band propagating upstream in the optical waveguide, wherein:
• the laser is integrated on the chip using template assisted bonding to integrate a direct-energy bandgap material on the chip;
• the third wavelength band is different from both the first wavelength band and the second wavelength band.