Fast fibre transceivers

NEC Corporation has debuted several new fibre optic transceivers that it will demonstrate at the Optical Fiber Communication Conference and Exposition at the end of March.

First up is the NEC OD-J8967 – a 10Gbit/sec optical transponder with a built-in semiconductor optical amplifier that has been designed for 80km long- reach applications. The transponder meets the Telcordia OC-192 LR-2b/ITU-T G.691 L-64.2b specification and is compliant with the mechanical and electrical standards of the 300-pin Multi-Source Agreement (MSA) for 10Gbit/sec optical transponders. The 104mm x 89mm x 16mm component is expected to bring about a significant reduction in the size and cost of long reach transmission systems, as the need for external optical amplifiers such as erbium-doped fiber amplifiers (EDFA) or additional passive dispersion compensation devices is eliminated. The transmitter module itself comprises a modulator-driver chip, an EML chip (electro-absorption modulator integrated DFB-laser) and Genoa’s new second-generation single-chip linear optical amplifier (LOA) – all combined on a common substrate.

The NEC OD-J8842 2.5Gbps SFP transponder, on the other hand, has been designed for 40km reach applications. It consists of a 2.5 Gbit/sec optical transponder packaged in an SFP (small form factor pluggable) module and meets the Telcordia OC-48 LR-1/ITU-T G.957 L-16.1 specification. The transponder features a transceiver module that is comprised of a high sensitivity APD (avalanche photodiode) essential for long distance transmission, its bias generation circuits and bias control circuits.

Lastly, the OD-B1222-N21 and OD-B1222-L21 1.25 Gbit/sec E-PON transceivers are transceiver modules for optical network units (ONU) and optical line terminals (OLT), suitable for use in Ethernet PON systems. A fully-integrated transceiver module is comprised of planar lightwave circuits with WDM function loaded with a LD and a PD by a passive alignment technique. The modules also sport a burst-mode transmitter and burst-mode receiver.

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