Simple in-line bi-directional 1.5/spl mu/m/1.3 /spl mu/m transceivers

We propose some simple new single-waveguide in-line photonic integrated circuit (PIC) architectures for 1.3pm/ 1.5pm WDM bi-directional (duplex) transmission. Using a prototype in-line 1.5pm transmit/l.3pm receive PIC as one station in a 200 Mb/s 155 Mb/s duplex link, we achieve 10BER over 28 km of fiber using no electrical cancellation or isolation techniques, and only 500 6dB noise figure amplifiers connected to the detectors. The design and fabrication simplicity of the new PIC'S suggest their potential usefulness in low-cost local-loop applications.