Abstract: In one embodiment, a silicon photonic integrated circuit (PIC) includes a pair of Mach-Zehnder Interferometers (MZI) with a phase shifter to function as a 1x2 optical switches. On one path between the MZIs is a wavelength interleaver. The MZI switch can be controlled to either an all-pass mode or a by-pass mode, therefore setting configurable optical demultiplexing bandwidths to support dual 1.6 T FR8/800G FR4 network backward compatibility. The configurable multiplexer operates at set-and-forget mode for the entire operating temperature and the product’s lifetime.

Abstract: Thermally compensated waveguides are disclosed herein. According to one aspect, the present disclosure proposes new ways to combine negative TOC (NTOC) material layers within the waveguides. NTOC materials can be implemented in one or more of a cladding layer, a core rib/channel waveguide, a horizontally segmented waveguide, a vertically segmented waveguide, a sub-wavelength grating structure, and/or in various other waveguide structure implementations including arbitrary core or cladding shapes. The integration of NTOC materials improves the temperature dependence of the waveguide spectrum. The need for fast and efficient optical-based technologies is increasing as Internet data traffic growth rate is overtaking voice traffic, pushing the need for optical communications.

Abstract: Techniques for photonic demultiplexers are disclosed. In the illustrative embodiment, an output of an unbalanced interferometer formed from waveguides is positioned to the input of a slab grating, with several output waveguides collecting light in different wavelength ranges to create different channels for the demultiplexer system. In some embodiments, one or more auxiliary structures may be positioned near the input of the grating to change the structure of the spatial modes being provided as an input to the grating in order to alter the spectra of the output channels.