F.-J. Westphal

Selective OTDR measurements at the central office of individual fiber links in a PON

Our proposal adds an arrayed waveguide grating (AWG) operated at 1.5 /spl mu/m to the star coupler of a passive optical network (PON) in the remote node (RN) and separates the original PON and the overlay via 1.3/1.5 /spl mu/m splitters, which guarantees the maintenance function.

Transparent, all-optical interconnection of two independent experimental OFDM-LANs via one central node

The all-optical transparent interconnection of two experimental OFDM-LANs is demonstrated. Fiber amplifiers are used to compensate network losses. Each LAN is equipped with four fully engineered, microprocessor-controlled, absolute frequency stabilized subscriber stations. The interconnection is realized utilizing a full duplex star coupler as central node. A proposal to extend the realized network for frequency re-use is given.<<ETX>>

AWG based WDM upgrade of a PON

An all-optical passive WDM upgrade of a passive optical network (PON) is proposed. By means of 1.3/1.5 /spl mu/m splitters the upgrade enables additional operation in the 1.5 /spl mu/m window without disturbing the operation at 1.3 /spl mu/m. The outside fiber plant remains unmodified. Key components of the upgrade are arrayed waveguide gratings (AWGs) in the remote node (RN) and in the central office (CO).

Stable operation of two OEIC-based tunable polarization-diversity heterodyne receivers

Stable operation of two optoelectronic-integrated-circuit heterodyne receivers (OEICs) in an experimental system is reported. The OEICs are monolithically integrated on InP and include a tunable laser, a passive polarization-diversity circuit, and balanced photodiodes (see Fig. I).1,2 The local oscillators (LOs) on the chips are four-section DBR lasers with a gain section and a phase section between two Bragg sections.