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The device used is a three-section, 3mum wide ridge waveguide laser based on commercially available material. During the fabrication a series of slots are introduced into the front and back sections, which act as sites of internal reflections. The slots are etched to a depth that just penetrates the top of the upper waveguide resulting in an internal reflectance of-1% at each slot. The front, middle,...
Optical channel monitoring is used for managing and conditioning dense wavelength division multiplexed (DWDM) signals in optically transparent transmission systems. In addition to measuring channel power and wavelength, more detailed channel identification information is desirable such as modulation format and bit rate. This application is particularly challenging in optically transparent mesh transport...
We connect the quantum limits for receiver sensitivity to the Shannon channel capacity and identify the corresponding quantum limits for direct-detection on-off keying modulation with forward error correction codes.
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