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1 May 1996 HBT laser driver array for WDM optical transmitters
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We will report on an 8-channel laser driver circuit intended to drive arrays of Distributed Feedback (DFB) lasers. These have been incorporated into transmitter modules operating at both 155 Mbit/sec and 2.488 Gbit/sec. Considerable power, cost and packaging savings can be achieved by this approach because the small driver size allows direct coupling of the driver and laser in compact modules, which also reduces the fiber alignment complexity. The peak current delivered to each laser is 60 mA; of this, up to 30 mA can be a DC bias current with the modulation current adjustable up to 30 mA peak-to-peak. The circuit is designed for an input signal of 300 mV differential into 50 Ohms. The modulation currents are separately adjustable for each channel. The circuit uses a differential signal path to achieve good common mode rejection to reduce crosstalk. The drivers were fabricated on a 500 micrometers spacing to match the DFB laser spacing, and care was taken to minimize capacitive coupling and crosstalk between channels. The power dissipation at maximum drive is 2.3 W with all 8 channels active.
© (1996) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenneth D. Pedrotti, P. J. Zampardi, F. Zucca, and Keh-Chung Wang "HBT laser driver array for WDM optical transmitters", Proc. SPIE 2690, Wavelength Division Multiplexing Components, (1 May 1996);

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