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A record performance metric waveguide grating router (WGR) design with a 200 GHz free spectral range (FSR) capable of resolving sub-GHz resolution spectral features is developed for a fine resolution photonic spectral processor (PSP). The WGR's FSR was designed to support subchannel add/drop from a superchannel of 1 Tb/s capacity. Due to fabrication imperfections, we introduce phase corrections to...
We extend the functionality of our photonic spectral processor to operate over any input polarization state by introducing polarization diversity. Some of the expected and unexpected challenges are discussed, leading to ∼1GHz resolution programmable filtering.
Photonic spectral processors based on waveguide grating routers (WGR) having ∼1GHz resolution are developed for flexible sub-band add/drop with an LCoS SLM. We describe means for correcting the WGR's phase errors, which are inherent due to extremely long waveguide delays.
We correct fabrication phase errors of 63-arm, 50GHz FSR AWG to achieve 1GHz resolution, by imaging the waveguides onto a phase spatial light modulator. Variable bandwidth and center frequency tuning is achieved by spatial filtering.
We apply a spatial light modulator to spectrally dispersed light at extremely fine resolution to realize an optical filter with the ability to set any spectral amplitude and phase modulation, subject to the optical resolution limit.
Fine optical filtering is instrumental in fully utilizing the optical gain bandwidth with communication signals. We present the design of a hybrid guided-wave / free-space filtering apparatus based on high resolution Arrayed Waveguide Gratings (AWG). These hybrid systems, called photonic spectral processors (PSP), can access and manipulate the fine spectral components of a lightwave signal with a...
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