Title :
Novel nonmagnetic 30-dB traveling-wave single-sideband optical isolator integrated in III/V material
Author :
Bhandare, Suhas ; Ibrahim, Selwan K. ; Sandel, David ; Zhang, Hongbin ; Wüst, Frank ; Noé, Reinhold
Author_Institution :
Chair for Opt. Commun. & High-Frequency Eng., Univ. of Paderborn, Germany
Abstract :
Various attempts have been made to fabricate waveguide-type isolators in III/V material by implanting magnetic materials, but none of them has so far resulted in a commercial product. Here, we report for first time on an integrated optical isolator implemented in III/V material. It consists of a single-sideband electrooptic modulator where traveling electrical waves make the transmission direction-dependent. Isolation is 30 dB, excess insertion loss is 8 dB. Residual rms ripple is 7% for peak-to-peak RF driving amplitudes of 3.5 V at 4.0 GHz. The estimated transmission penalty for 40 Gb/s return-to-zero differential phase shift keying (RZ-DPSK) signals is 0.2 dB (0 dB measured).
Keywords :
III-V semiconductors; electro-optical modulation; integrated optics; optical communication equipment; optical isolators; phase shift keying; 3.5 V; 4.0 GHz; 40 Gbit/s; 8 dB; III/V material; electrooptic modulator; insertion loss; integrated optical isolator; nonmagnetic isolator; return-to-zero differential phase shift keying; single-sideband isolator; transmission penalty; traveling electrical waves; traveling-wave isolator; Electrooptic modulators; Insertion loss; Integrated optics; Isolators; Magnetic materials; Optical losses; Optical materials; Optical modulation; Optical waveguides; Radio frequency; Integrated optical devices; optical isolator; traveling-wave (TW) devices;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2005.845620
