Evanescent Field Based Fiber Variable Optical Attenuators

by Dr. Tigran GALSTIAN, Center for Optics, Photonics and Lasers (COPL), Physics Department, Laval University, Quebec Canada

 :  29 Nov 2005 (Tue)
 :  11:00am - 12:00noon
Venue  :  Room 1504, 1/F (Lift 25-26), HKUST

While the volume and complexity of the information traffic are rising, the pressure is high on service providers to lower their prices. They need scalable and flexible networks to meet this challenge; adding and dropping of channels into a network bring the need to dynamically adjust the signal at nearly every nodes of the network to ensure a proper operation. Electronically-controlled and software-configured (dynamically tunable and adaptable) power management optical components will be key enabling elements to increase the flexibility, reliability and profitability of optical communication networks.

An approach, using the evanescent field of light and corresponding family of Electrically Variable Optical Attenuator (EVOA) will be described. Applying an electrical signal to the EVOA will make a fraction of the light leave the fiber and dynamically modulate the amplitude of the light remaining in the fiber.

Tigran V. Galstian (or Galstyan) received the B.Sc. degree in Nuclear Physics in 1984 from Yerevan State University, Armenia. He received the M.Sc. degree in Solid State Lasers in 1987 and Ph.D. degree in Quantum Electronics in 1990 from the Special Department of Physics at Moscow Engineering Physics Institute, Moscow, Former Soviet Union.

He joined the Institute of Applied Problems in Physics as Engineering Researcher in 1990 and in 1991, the Yerevan State University as a Researcher and later as Senior Scientist. Since 1992, he was been a Postdoctoral Researcher in the Institut d'Optique, Orsay, France and an Assistant Professor of the Rennes I University since 1994. He joined the Center for Optics, Photonics and Lasers at Laval University in 1995 as an Assistant (then Associate, in 1999) Professor of the Physics Department where he funded the laboratory of Photonic Materials and Components. In 2000, he co-funded Photintech inc. that is developing and commercializing innovative fiber optic components for Information, Sensing, Test & Measurement, Military and Medical industries. His main interests are in new optical materials and their applications in optical information technologies. He has up to 350 scientific publications, communications and patents. He is member of the Ordre des Ingenieurs du Quebec, OSA, MRS and Societe Francaise d'Optique.



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