We demonstrate a widely tunable distributed Bragg reflector (DBR) laser operating at 1.8-µm, in which the DBR section was butt-jointed InGaAsP (λ = 1.45 μm) material. Through current and temperature tuning, tuning range of over 11 nm with side mode suppression ratio (SMSR) higher than 30 dB is obtained. Utilizing this laser, water methane detection experiment has been successfully implemented, ...

We have microfabricated 2-D photonic bandgap structures in a thin slab of dielectric material to define reflectors and high-Q microresonators. By selectively omitting holes from the two-dimensional photonic crystal, laser cavities and optical resonator switches can be defined. We have designed this structure with a finite diffe:rence time domain (FDTD) approach, and demonstrate some promising d...

A dynamical model for multichannel amplification by near-traveling-wave optical amplifiers is presented, and results on crosstalk induced by either amplitude modulation or frequency modulation are given. The mechanisms influencing the crosstalk are especially the residual facet reflectivities and the detuning of the channels relative to the amplifier Fabry-Perot spectrum. Calculations of worst ...