Three High-Performance Semiconductor Laser Emission Sources Commercialized

Mar 03, 2005

Nippon Telegraph and Telephone Corporation and NTT Electronics Corporation have endeavored to commercialize new laser emission sources that are optimum for next-generation communication systems and applications in non-communication fields such as medicine and the environment.

They intend to launch three new products soon via the sales channels of NEL.

  • 2.5 Gbps direct-modulation laser emission source for long-distance transmission, which is operable without temperature control
  • Variable-wavelength laser emission source, for which emission wavelength can be arbitrarily set using only one element in a specific wavelength range
  • Laser emission source with oscillation wavelengths in excess of 2.0 _m, which is applicable to measuring instruments in the medical and environmental fields

    These new products are the result of the successful commercialization of NTT Photonics Laboratories' long-accumulated design and manufacturing technologies for the light sources of backbone optical communication systems. Jointly with NEL, NTT has focused on the commercialization of such systems based on the Comprehensive Commercialization Functions introduced by NTT in July 2003.

    Background
    To supply high-speed, large-capacity communication services to households of individual subscribers via FTTH (fiber to the house), an optical-fiber communication network to connect the core system with the subscriber (access) systems is indispensable. The required systems for networking must not only ensure high speed and large capacity but also meet the requirement of being economical to supply less expensive communication services. To that end, especially for the light sources of subscriber (access) and metro systems, it is considered necessary to dispense with the temperature adjustment function, which requires a complicated device control and high power consumption.

    NTT's 2.5 Gbps direct-modulation laser emission source for long-distance transmission, which is operable without temperature control, was developed to address this need.

    Previously, it was necessary to prepare several light sources with different wavelengths for the WDM, an economical networking technology used for communications to effectively connect metro and core systems. NTT's variable-wavelength laser emission source for which emission wavelength can be arbitrarily set to a specified wavelength range was developed to eliminate complexity and increase the number of light source inventories. Meanwhile, these semiconductor lasers for communication have features in non-communication fields such as excellent wavelength controllability, compact size and low cost compared with solid-state lasers. Accordingly, some recent approaches have extended their application to light sources for optical sensors. However, until recently there were no semiconductor lasers that could oscillate around 2.0 _m wavelength despite strong demand in the medical and environmental fields, therefore expensive and large-scale, solid-state lasers were used instead. NEL showed its presence in these application fields by commercializing a semiconductor laser with oscillation wavelengths at 2.0 _m in 2004.

    NEL has also developed a DFB laser with oscillation wavelength in excess of 2.0 _m in response to requests such as the extended lineup of measurable substance types, the extensible optimum absorption wavelength range depending on measured items by each substance and simultaneous measurements for several wavelengths.

    NTT and NEL have endeavored to realize higher performance of semiconductor laser emission sources for optical communications and accumulated sophisticated design and manufacturing technologies to meet the stringent requirement of higher capacity for backbone optical communication systems. Applying the accumulated technologies led to the development of these new products.


    Explore further: US official: Auto safety agency under review

    add to favorites email to friend print save as pdf
  • Related Stories

    MasterCard, Zwipe announce fingerprint-sensor card

    1 hour ago

    On Friday, MasterCard and Oslo, Norway-based Zwipe announced the launch of a contactless payment card featuring an integrated fingerprint sensor. Say goodbye to PINs. This card, they said, is the world's ...

    Plastic nanoparticles also harm freshwater organisms

    3 hours ago

    Organisms can be negatively affected by plastic nanoparticles, not just in the seas and oceans but in freshwater bodies too. These particles slow the growth of algae, cause deformities in water fleas and impede communication ...

    Atomic trigger shatters mystery of how glass deforms

    3 hours ago

    Throw a rock through a window made of silica glass, and the brittle, insulating oxide pane shatters. But whack a golf ball with a club made of metallic glass—a resilient conductor that looks like metal—and the glass not ...

    US company sells out of Ebola toys

    11 hours ago

    They might look tasteless, but satisfied customers dub them cute and adorable. Ebola-themed toys have proved such a hit that one US-based company has sold out.

    UN biodiversity meet commits to double funding

    12 hours ago

    A UN conference on preserving the earth's dwindling resources wrapped up Friday with governments making a firm commitment to double biodiversity aid to developing countries by 2015.

    Recommended for you

    US official: Auto safety agency under review

    6 hours ago

    Transportation officials are reviewing the "safety culture" of the U.S. agency that oversees auto recalls, a senior Obama administration official said Friday. The National Highway Traffic Safety Administration has been criticized ...

    Out-of-patience investors sell off Amazon

    6 hours ago

    Amazon has long acted like an ideal customer on its own website: a freewheeling big spender with no worries about balancing a checkbook. Investors confident in founder and CEO Jeff Bezos' invest-and-expand ...

    Ebola.com domain sold for big payout

    6 hours ago

    The owners of the website Ebola.com have scored a big payday with the outbreak of the epidemic, selling the domain for more than $200,000 in cash and stock.

    Hacker gets prison for cyberattack stealing $9.4M

    10 hours ago

    An Estonian man who pleaded guilty to orchestrating a 2008 cyberattack on a credit card processing company that enabled hackers to steal $9.4 million has been sentenced to 11 years in prison by a federal judge in Atlanta.

    Magic Leap moves beyond older lines of VR

    11 hours ago

    Two messages from Magic Leap: Most of us know that a world with dragons and unicorns, elves and fairies is just a better world. The other message: Technology can be mindboggingly awesome. When the two ...

    User comments : 0