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Among other factors, the widespread deployment of fiber-in-the-loop (FITL) is hindered by the lack of availability of low- cost laser transmitters that emit at a wavelength of 1.3 μm and operate reliably over the temperature range of −40−85°C. To date, commercial laser transmitters have relied on thermoelectric (TE) coolers to maintain the laser temperature constant against the variations in the ambient temperature because the conventional GaxIn1−xAsyP1−y/InP lasers have shown a strong temperature dependence of threshold current and external quantum efficiency.1,2
© 1994 Optical Society of America
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