Scalable heterogeneous (hybrid) silicon photonic (SiPh) wavelength division multiplexing laser source architectures suitable as a fiber-coupled external photonic IC (PIC) source for high-bandwidth communication between computing resources. Hybrid-silicon laser sources may be arrayed over a silicon substrate into physically separate banks of lasers, each bank spanning a different range of consecutive wavelength channels and each bank including physically separated odd and even channel groups within a channel range. Optical signals generated by each channel group are passed to a multi-mode interference (MMI) coupler that multiplexes the channel group split across some number of output streams that may be limited to maintain sufficient output power for a given application. The odd channeled multiplexed signals and the even channeled multiplexed signals are passed to interleavers that generate a full spectrum output signal for each bank. Output signals from all banks exit the PIC through an output coupler.

Described herein are wavelength division multiplexing (WDM) transceivers configured to support fast, bidirectional communication over optical channels. An optical transceiver comprises a transmitter, a receiver, an input/output (I/O) port and an optical interleaver. The transmitter comprises a first bus waveguide and a plurality of optical modulators coupled to the first bus waveguide, each of the optical modulators being resonant at a respective wavelengths in a first wavelength set. The receiver comprises a second bus waveguide and a plurality of optical filters coupled to the second bus waveguide, each of the optical filters being resonant at a respective wavelength in a second wavelength set. The (I/O) port is coupled to an optical channel. The optical interleaver is configured to selectively couple light having wavelengths in the first wavelength set from the first waveguide bus to the I/O port, and selectively couple light having wavelengths in the second wavelength set from the I/O port to the second bus waveguide.

A photonic circuit operating as a photonic register includes a first set of cascading photonic gates coupled to a second set of cascading photonic gates. The first set of cascading photonic gates generates, at a first output, a first intermediate output signal based on a first photonic input signal and a second photonic input signal, and generates, at a second output, a second intermediate output signal based on the second intermediate output signal and the second photonic input signal. The second set of cascading photonic gates generates, at a first output, a first photonic output signal based on the first intermediate output signal and a second photonic output signal that was generated at a second output. The second set of cascading photonic gates generates, at the second output, the second photonic output signal based on the first intermediate output signal and the first photonic output signal.

A wavelength division multiplexing device includes an alignment substrate configured to provide alignment between optical components of the device. The device includes a plurality of collimating lenses, and the alignment substrate includes a plurality of aligners. Each of the aligners is configured to place a respective one of collimating lenses in a predetermined position and a predetermined orientation with respect to the other collimating lenses. The alignment substrate thereby provides passive alignment of the collimating lenses with a designed optical path. The substrate may also include visual alignment markings that provide an indication of the placement of multi-layer thin film filters so that the filters define an actual optical path in alignment with the designed optical path, and integrated optical waveguides that provide an optical beam to each of the collimating lenses.

Described herein are wavelength division multiplexing (WDM) transceivers configured to support fast, bidirectional communication over optical channels. An optical transceiver comprises a transmitter, a receiver, an input/output (I/O) port and an optical interleaver. The transmitter comprises a first bus waveguide and a plurality of optical modulators coupled to the first bus waveguide, each of the optical modulators being resonant at a respective wavelengths in a first wavelength set. The receiver comprises a second bus waveguide and a plurality of optical filters coupled to the second bus waveguide, each of the optical filters being resonant at a respective wavelength in a second wavelength set. The (I/O) port is coupled to an optical channel. The optical interleaver is configured to selectively couple light having wavelengths in the first wavelength set from the first waveguide bus to the I/O port, and selectively couple light having wavelengths in the second wavelength set from the I/O port to the second bus waveguide.