Search Menu
Photonics Media Photonics Buyers' Guide Photonics EDU Photonics Spectra BioPhotonics EuroPhotonics Industrial Photonics Photonics Showcase Photonics ProdSpec Photonics Handbook
More News
Email Facebook Twitter Google+ LinkedIn Comments

Tunable Lasers Prompt Lawsuit

Photonics Spectra
Sep 2001
Stephanie A. Weiss

Tunable laser technology is the basis for a lawsuit in which Photonetics accuses New Focus Inc. of infringing a US patent.

Photonetics Inc. of Peabody, Mass., and Photonetics SA of Marly-le-Roi, France, sued New Focus of San Jose, Calif., on July 20. The federal lawsuit alleges that New Focus tunable lasers infringe Photonetics' US Patent No. 5,594,744.

Tunable lasers are a core technology in test instruments for wavelength division multiplexed (WDM) communications networks. Because these devices can vary their wavelength, one of them can test several channels of a WDM system.

The Photonetics patent, "Singlemode laser source tunable in wavelength with a self-aligned external cavity," is the foundation for Photonetics' Tunics tunable laser, the company's core product line.

The patent covers single-mode lasers that change wavelengths via an external cavity with specific characteristics: a resonant cavity with a partly reflective output face, a retroreflecting dispersive device that defines two collimating axes, and an amplifier waveguide that is located inside the cavity.

New Focus has its own patent on external-cavity tunable laser technology, US Patent No. 6,108,355, "Continuously tunable external cavity laser." This patent covers a laser comprising a laser amplifier, retroreflector, first and second reflector, and a translator that moves the reflectors to vary the separation between them and thereby tune the laser amplifier.

BusinessCommunicationslight speedTunable Laserslasers

Terms & Conditions Privacy Policy About Us Contact Us
back to top
Facebook Twitter Instagram LinkedIn YouTube RSS
©2018 Photonics Media, 100 West St., Pittsfield, MA, 01201 USA,

Photonics Media, Laurin Publishing
x Subscribe to Photonics Spectra magazine - FREE!
We use cookies to improve user experience and analyze our website traffic as stated in our Privacy Policy. By using this website, you agree to the use of cookies unless you have disabled them.