Room-temperature cw electrically pumped external-cavity surface-emitting laser diodes are reported. The external cavity provides a way to control the transverse modes of the surface-emitting laser diodes. Powers greater than 100 mW pulsed and 2.4 mW cw in the lowest order (TEM00) transverse mode are reported. The surface-emitting laser diode was grown on a p-doped substrate, resulting in uniform current injection in devices as large as 100 μm in diameter. To our knowledge, this is also the first report of a working surface-emitting laser diode grown on a p-type substrate.

Articles you may be interested inPhysics of mode selectivity of vertical-cavity surface-emitting diode lasers

A predistortion circuit with adjustable amounts of third-and fifth-order predistortion is studied both theoretically and experimentally. The circuit is used to cancel the third-and fifth-order intermodulation distortion of a 1.55-m integrated electroabsorption modulator/DFB laser. The CSO obtained is 061 dBc and the CTB is reduced 22.6 dB to 065 dBc. This performance is maintained after fiber amplification and propagation through 13 km of nondispersion shifted fiber due to the modulator's low chirp. Dithering of the DFB laser's injection current is employed to increase the stimulated Brillouin scattering (SBS) threshold to +13.4 dBm.

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