Title :
Coupling coefficient modulation of waveguide grating using sampled grating
Author :
Shibata, Yasuo ; Tamamura, Toshiaki ; Oku, Satoshi ; Kondo, Yasuhiro
Author_Institution :
NTT Opto-Electron. Labs., Kanagawa, Japan
Abstract :
A new method of modulating the coupling coefficient along the waveguide is proposed. The effect of our method, which uses a nonperiodic sampled grating, is demonstrated both theoretically and experimentally. A Bragg filter is fabricated on an InGaAsP/InP wafer utilizing the method, and the sidelobe level is shown to improve by 7 dB compared with a conventional filter with a uniform coupling coefficient. The experimental results are found to be in good agreement with calculations.<>
Keywords :
III-V semiconductors; diffraction gratings; gallium arsenide; indium compounds; multiplexing equipment; optical communication equipment; optical couplers; optical filters; optical waveguides; wavelength division multiplexing; Bragg filter; InGaAsP-InP; InGaAsP/InP wafer; coupling coefficient modulation; nonperiodic sampled grating; sampled grating; sidelobe level; waveguide grating; Fourier transforms; Gratings; Optical fiber polarization; Optical filters; Optical modulation; Optical reflection; Optical refraction; Optical variables control; Optical waveguides; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
