Research and engineering are being done to incorporate polymer waveguide elements within commercial-grade silica planar-lightwave circuits to enable robust thermo-optic switches and programmable attenuators as integrable components. One of the key targets for this phase of the technology is a fully-integrated, fully-reconfigurable optical add-drop module, wherein the optical dense wavelength-division multiplexers are silica arrayed- waveguide gratings with polymer thermo-optic switches and add-drop waveguide channels interposed on the same substrate for a monolithic module.
We describe distributed Bragg pulse shapers for the ultra-fast communication system wavepacket encoding. We discuss Bragg pulse shaper design and fabrication and we present experimental results from first and second generation devices.
A high-quality microwave signal is generated by heterodyning two diode-laser-pumped Nd:YAG lasers. A III-V semiconductor optical waveguide containing a doping superlattice is used to manipulate the phase and amplitude of one of the laser outputs before they are mixed. This manipulation appears directly as a corresponding change in the phase and amplitude of the heterodyne microwave signal. Results are presented from near dc to 52 GHz. Phase changes as large as 8 pi, and amplitude changes as large as 42 dB have been induced by means of a 1.2-mm-long optical waveguide and less than 3 V of control voltage.
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