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2 April 2007


NEC launches extended-reach XFP transceiver without dispersion compensation, based on AZNA’s CML

At last week’s Optical Fiber Communication conference (OFC 2007) in Anaheim, CA, USA, Tokyo-based NEC demonstrated an extended-reach 10Gb/s XFP transceiver for 160km links.

Since conventional electro-absorption modulator integrated lasers (EML) or Mach-Zehnder modulators used in long-distance transmission are limited to a distance of around 80km, there has been demand for longer-range capability.

The use of NEC’s planar lightwave circuit (PLC) technology allows further miniaturization of AZNA's extended-reach chirp-managed laser (CML) transmitter technology, providing a potentially low-cost, compact transmitter optical subassembly (TOSA), says NEC. The resultant transceiver addresses the demand for high-density pluggable optics and eliminates the need for dispersion compensation in 2.5-10Gb/s upgrades.

AZNA’s CML uses a standard distributed feedback (DFB) laser and a passive optical spectrum reshaper (OSR) filter to achieve extended reach. NEC’s PLC-based OSR replaces the bulky version of the OSR used in AZNA’s existing products. The PLC-based CML reduces parts count and allows passive optical alignment, allowing mass production at lower cost, claims NEC.