Tunable long-period fiber grating

Hisami Nishi; Akira Matsumura; Junji Nishii

doi:10.1117/12.474806

17 June 2003 Tunable long-period fiber grating

Hisami Nishi, Akira Matsumura, Junji Nishii

Proceedings Volume 4989, Optical Devices for Fiber Communication IV; (2003) https://doi.org/10.1117/12.474806
Event: Integrated Optoelectronics Devices, 2003, San Jose, CA, United States

Abstract

Long-period fiber grating (LPFG) having grating periodicity in the hundreds of microns, functions as a band rejection filter. This device is useful for gain equalizing applications of fiber amplifiers.The transmission characteristics are mainly determined by the initial fabricating conditions such as grating periodicity and UV exposure time. Therefore, it was very difficult to tune the transmission characteristics with wide range after the LPFG was made. Many works have been reported to tune the resonant wavelength and depth of the dip point. But, tuning range of resonant wavelength was not so wide and resonant depth was not easy to control after the grating fabrication. In this paper, we have proposed, analyzed and evaluated the novel and simple method to tune the wavelength characteristics of LPFG after the grating fabrication. In this device, the grating is divided into two regions. One region is the conventional LPFG, and the other region is the modified LPFG surrounded outside the cladding with a medium having higher or lower refractive index than that of the cladding. In case of the higher refractive index, only resonant depth could be controlled over 20dB without resonant wavelength shift. In case of the lower refractive index, resonant wavelength could be moved around 40 nm while resonant depth change is small. The experimental results were compared with the theoretical analysis. Both results showed good agreements.

Citation Download Citation

Hisami Nishi, Akira Matsumura, and Junji Nishii "Tunable long-period fiber grating", Proc. SPIE 4989, Optical Devices for Fiber Communication IV, (17 June 2003); https://doi.org/10.1117/12.474806

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available