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Applied Optoelectronics Inc (AOI) of Sugar Land, TX, USA has introduced dense wavelength division multiplexing (DWDM) transmitter lasers capable of greater than 200km (3600ps/nm) transmission in a single-mode fiber.
Featuring an integrated high-speed, low-dispersion-penalty distributed
    feedback (DFB), multi-quantum-well (MQW) laser in a hermetically sealed,
    industry-standard 14-pin butterfly package with optical isolator, the device
    is available in the full range of C-band ITU-T G.692 recommended wave- lengths
    at 100GHz spacing and meets GR 468 reliability specifications. Input
    impedance is 25 OhmRF. The laser is also compatible with direct modul- ation
    at up to 2.5Gbps, for OC-48/STM-16 applications.
"As fiber optic communication networks are expanding and growing, the demand
    for more cost-efficient solutions is rising. DWDM technology allows network
    operators to increase their capacity while avoiding the costly installation
    of additional infrastructure", says product manager Dr Zulfikar Morbi. "With
    AOI's advanced MBE fabrication technology, we can provide a long-reach
    product that guarantees the transmission distance necessary to meet this
    emerging customer demand."
Also available is a 10mW DWDM butterfly-packaged laser for 120km
    transmission distance without an erbium-doped fiber amplifier (EDFA). This
    device combines the low dispersion penalty of the 200km devices with +10dBm
    optical output power, enabling amplifier-free operation in many
    metropolitan-area network applications.
Visit: http://www.ao-inc.com