Title :
Nondestructive optical fiber modulation using radiation mode coupling phenomena
Author :
Nakamura, Kazunori ; Yoshino, Toshihiko
Author_Institution :
Dept. of Electr. Eng., Gunma Univ., Japan
fDate :
2/1/1997 12:00:00 AM
Abstract :
We demonstrate a nondestructive optical fiber modulation technology based on a radiation mode coupling (RMC) interference effect that modulates the phase difference between a guided mode and recoupled radiation modes. Because of high sensitivity of the RMC effect in the buffer layer, deep signal modulation in frequency region to the order of MHz is successfully generated by applying slight lateral deformation of a few μm to the fiber with the piezoelectric device. Modulation index of 30 was achieved for an applied voltage of 14 Vpp and no signal fading was observed for all the states of polarization. This technique enables a free access modulation at any points along optical fibers with a wide frequency band response and low applied voltages and requires no complex composition such as polarization diversity
Keywords :
electro-optical modulation; fading; optical fibre communication; optical fibre couplers; optical fibre polarisation; optical fibres; sensitivity; applied voltage; buffer layer; deep signal modulation; free access modulation; frequency region; guided mode; high sensitivity; low applied voltages; modulation index; nondestructive optical fiber modulation; phase difference modulation; piezoelectric device; polarization diversity; radiation mode coupling interference effect; radiation mode coupling phenomena; recoupled radiation modes; slight lateral deformation; states of polarization; wide frequency band response; Buffer layers; Frequency modulation; Interference; Optical coupling; Optical fiber devices; Optical fiber polarization; Optical fibers; Optical modulation; Phase modulation; Signal generators;
Journal_Title :
Lightwave Technology, Journal of
