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28 December 2007


SEI launches DWDM SFP transceivers with 3200ps/nm dispersion tolerance for 160km reach

Tokyo-based Sumitomo Electric Industries Ltd (SEI) has launched a new series of 2.66057Gb/s dense wavelength division multiplexing (DWDM) small form factor pluggable (SFP) transceivers.

The SCP9FB8 series is designed to support a dispersion tolerance of 3200ps/nm and a reach of 160km by adopting a laser driver with low-chirp characteristics and optimizing the laser diode drive current. Previous 160km transmission dispersion tolerance (for the SCP9EA8 model) was 2400ps/nm; conventional models can be deployed in data links with spans of up to 120km.

Also, the transceiver is equipped with a variable decision threshold (VDT) function, which reshapes the received waveform by optimizing the logical judgment threshold level by means of 12C (inter-IC bus).

The SCP9FB8’s minimun sensitivity is >-30dBm and the overload is -7dBm (compared to the SCP9EA8’s >-28dBm and -9dBm, respectively).

“Expansion of distance is the key to fulfilling customer demand,” says Ichiro Kono, general manager of SEI’s Optical Transmission Components Division. “SEI is not the leading company in the long-haul market, but these products should expand our business opportunities,” he reckons.

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