TEMPERATURE INSENSITIVE DEMUX/MUX IN SILICON PHOTONICS

摘要

A temperature insensitive DEMUX/MUX device whose wavelength does not change by environment temperature is provided for WDM application. The temperature insensitive DEMUX/MUX device includes a waveguide-based delay-line-interferometer configured to receive an input light bearing multiplexed wavelengths and output a first output light bearing the same multiplexed wavelengths but with a shifted intensity peak position. The first output light is transmitted into a DEMUX device through a first free space coupler and a grating fiber or waveguide to be demultiplexed for forming a plurality of second output lights each bearing an individual wavelength. The DEMUX device includes a second free space coupler for refocusing each second output light to corresponding output channel. The shifted intensity peak position of the first output light is tunable to make each second output light free from any temperature-induced drift off corresponding output channel.

主权项

1. A temperature-insensitive DEMUX/MUX device for WDM applications comprising:
a delay-line interferometer including a first MMI coupler configured to receive a first input light bearing multiple wavelengths and split into two branches of light to respectively transmit through two waveguides with a phase delay, a second MMI coupler configured to combine the two branches of light to form a first output light passing through an exit plane displaced a first distance further from a focus point of the two branches of light; a first free-space coupler with an input plane attached with the exit plane of the second MMI coupler to receive the first output light as a second input light bearing the same multiple wavelengths, one or more optical fibers or waveguides for grating the second input light spatially based on the multiple wavelengths, and a second free space coupler configured to refocus the spatially grated light to form multiple second output lights respectively at multiple output channels each carrying an individual wavelength of the multiple wavelengths; wherein the first output light comprises an intensity peak position at the exit plane that is shifted away from a projected position of the focus point of the two branches of light by a second distance as environmental temperature is changed, the second distance is tunable to make each of the second output lights with corresponding individual wavelength being substantially free from any spatial shift off the corresponding output channel at any environmental temperature.