NEC has made advances in the technology of tunable
lasers that will cut the cost of fibre optic equipment and help
communications carriers deliver more efficient communications
services, a service which will be available by October
2005.
While other companies have previously developed tunable lasers,
the one developed by NEC is cost-effective enough to be widely used
to replace the functions of many lasers currently used in fibre
optic networks, according to Hiroyuki Yamazaki, principal
researcher at NEC's system platforms research laboratories.
"We think we could make the laser for about half the cost of any
other competitor, and we want to put it on sale internationally,"
said Yamazaki. He declined to say how much the laser might
cost.
Other companies that have developed tunable lasers include
Agility Communications, Intel, Iolon and Santur.
Modern fibre optic networks operate on multiple wavelengths and
the older varieties tend to use separate lasers for each
wavelength. On top of maintaining these lasers, communications
companies have to keep spares.
Using tunable lasers means carriers can install just one type of
laser instead of many, saving money, parts and inventory costs,
said Yamazaki.
There are two main types of tunable lasers that are used to send
light pulses through fibre optic cables. Some designs are based on
a monolithic-type laser that integrates all the laser's components
into a semiconductor chip. The second main type uses MEMS
(microelectromechanical systems) technology which incorporates
minute movable mirrors to adjust the laser wavelength.
Typically, monolithic-type lasers are complex to design and
difficult to make, while MEMS-type tunable lasers tend to require
maintenance to keep them performing efficiently, he said.
The NEC laser is built on a LSI (large-scale integrated circuit)
process that NEC uses to make semiconductor chips, so it is
relatively easy to make at a low cost, while it is powerful enough
and flexible enough to cater for the varied needs of fibre optics
communications, he said.
Paul Kallender writes for IDG News Service