Dynamic wavelength stabilization of an AlGaAs diode laser has been demonstrated. The diode laser is butt coupled to a stripe-loaded optical waveguide which contains a Bragg reflecting grating. The laser is pulsed with 50-ns-long, 25% duty cycle, 100% modulation depth pulses and the waveguide output is observed to remain at single wavelengths over a peak current range of 120–160 mA and 15 °C temperature variations.
Grating couplers between low-refractive-index (n ≈1.5) optical fibers and high-refractive-index (n ≈2.2) electro-optic planar guides have been analyzed and demonstrated. Coupling efficiencies of 6% between single modes of a film and a fiber have been observed. Efficiencies of approximately 86% between single-mode fibers and films using blazed backward-wave gratings are predicted. In addition, low-loss low-optical-aperture multimode fibers may be coupled to single-mode films with efficiencies greater than 50% and angular spreads less than 0.5°.
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