K2 Optronics is offering 4.25-Gb/s DWDM lasers for use in metropolitan and extended storage area networks. They are available in ITU-standard wavelengths across the C-band for links of up to 120 km. The company says that the lasers, based on a proprietary external-cavity platform, provide a lower dispersion penalty and lower chirp than directly modulated distributed-feedback lasers. They are designed for wavelength stability and do not require wavelength lockers or complex feedback control circuits.

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