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Due to a reduction of waveguide loss achieved by doping-profile modification, low-power operation, i.e. threshold current of as low as 0.9 mA as well as differential quantum efficiency of around 50% from the front facet, was achieved with 1.55-mum wavelength distributed reflector lasers with wirelike active regions. Injection currents for 1-mW output power of 4.2 and 3.6-mA were obtained for uniform...
Optical feedback-tolerance of distributed-reflector (DR) laser with a wirelike distributed-feedback section and distributed-Bragg-reflector (DBR) section was investigated. Isolator-free 2.5-Gb/s-10-km transmissions and low RIN were demonstrated under -13.5-dB optical back-reflection with a power penalty of 2-dB.
Dynamic characteristics of 1.55 mum wavelength distributed reflector (DR) lasers with wirelike active regions were examined for the first time. BER measurements over a wide temperature range were performed. 10 km error-free transmission at 10 Gbit/s was confirmed by using a dispersion-shifted fiber.
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