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The high cost of laser transmitters has prevented the realization of FTTH in the foreseeable future. The authors have developed high-performance 1.3 /spl mu/m laser diodes which have the potential to render the high-cost components inside the transmitter dispensable and greatly reduce the cost of transmitters. Low-cost fabrication, tight lot-to-lot control, excellent device yield, and uniform parameter distributions have been simultaneously achieved. With further structure and process optimizations, we have reduced threshold currents to as low as 6 mA at 25/spl deg/C, while maintaining high T/sub 0/ of 85 K.