Abstract
A very high-speed laser diode (LD) module, having a "butterfly" type dual-in-line structure is developed. This LD module consists of a laser diode, a p-i-n-photodiode for monitoring the laser power, a thermoelectric cooler, and a thermistor. The power emitted from the LD is coupled into a single-mode fiber using a hemispherical tapered fiber technique. The microwave design of the LD module employing high frequency equivalent circuit and scattering ( <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">S</tex> ) parameters is shown. Parasitic inductances and capacitances in the LD module degrade the high frequency characteristics. This is a very serious problem in gigabit fiber-optic transmission systems. The microwave impedance, small signal high frequency characteristics, and high-speed pulse response of the fabricated module with low parasitics are also shown. Electrical resonance frequency is 4.8 GHz and well opened eye patterns up to 4 Gbit/s are obtained in the experiments.
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