Analog Laser Module

A new 1550 nanometer (nm) analog laser module for forward-and-return path dense wavelength division multiplexing (DWDM) cable television applications has been introduced. Called the A1751A DWDM Analog Laser Module, the new laser module operates over a temperature range of -40 degrees C to +85 degrees C, enabling operators to install the laser in equipment for indoor or outdoor environments. It operates at wavelengths from 1528.77 to 1561.42 nanometers with reliability and high linearity, making it suitable for DWDM systems being installed by cable operators.

DWDM has gained widespread acceptance in the telecommunications market and is being designed into emerging cable television architectures. A new method for delivering targeted quadrature amplitude modulation(QAM) signals to different locations, DWDM allows multiple signal sets to be combined onto a single strand of fiber for transmission from a head-end to a hub. At the hub, individual QAM signals can be selected and combined with broadcast analog channels. The laser module can help reduce cable network architecture fiber needs and lessen equipment requirements in the hub.

In addition to using advanced thermoelectric cooling techniques, the laser module is designed with a new lens and fiber coupling configuration that can boost maximum power output up to 10 milliwatts, which improves optical performance in high-bandwidth DWDM applications. Its frequency range is five megahertz (MHz) to 870 MHz.

Lucent Technologies Microelectronics Group, 283 King George Road, New Jersey, NJ 07059. Tel: 908-559-6035; Fax: 908-559-1124.