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We present an efficient and compact (5xlOxl.8 cm3) Er:doped fiber amplifier (EDFA) module pumped with a 980 nm laser diode. We showed that this EDFA module is capable of operating with optimum gain and noise performance over a 30 nm bandwidth at 1550 nm, and with low electrical consumption (less than 100 mW). Using the EDFA as a rack mounted preamplifier module in a 2.5 Gbit/s direct detection system experiment, we achieved a -38.5 dBm receiver sensitivity at 10 bit error rate, and demonstrated long term operation (BER of 6. 10 14) ofthe overall system.

Research and development effort on a field deployable coherent lightwave system at AT&T Bell Laboratories is reviewed. Detailed features and design of a 1 .7 Gb/s FSK single filter heterodyne detection system and its performance in a one-month transmission field trial are described. Long distance transmission experiments of such a system with Er-doped fiber amplifiers at 1 .7 Gb/s and 2.5 Gb/s are presented.This paper reviews the progress of a field deployable coherent transmission system at AT&T Bell Laboratories, specifically the 1.7 Gb/s FSK single filter heterodyne detection * APT

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