Title :
Temperature-Insensitive Mode Converters With CO2-Laser Written Long-Period Fiber Gratings
Author :
Jiangli Dong ; Kin Seng Chiang
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong, China
Abstract :
We fabricate mode converters by directly writing long-period gratings in a two-mode fiber with a CO2 laser. These mode converters allow the fundamental LP01 mode to be converted to any of the four higher order cylindrical vector modes or the LP11 modes. The transmission characteristics of these devices are insensitive to temperature variations and the mode conversion efficiency is insensitive to the polarization state of the input light. One of our typical gratings, which contains 15 grating periods, can provide a conversion efficiency >99% over a bandwidth of 34.0 nm in the C-band. These robust mode converters could find applications in mode-division-multiplexing systems and other applications that require cylindrical vector modes.
Keywords :
carbon compounds; diffraction gratings; gas lasers; laser materials processing; optical fibre fabrication; optical fibre polarisation; C-band; CO2; CO2-laser written long-period fiber gratings; LP11 modes; cylindrical vector modes; fundamental LP01 mode; input light; mode conversion efficiency; mode-division-multiplexing systems; polarization state; temperature variations; temperature-insensitive mode converters; transmission characteristics; two-mode fiber; Fiber gratings; Fiber lasers; Gratings; Laser beams; Optical fiber polarization; Vectors; Long-period fiber grating; cylindrical vector mode; cylindrical vector modes; mode converter; mode-division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2015.2405092
