Title :
Signal bandwidth of general n×n multimode interference couplers
Author :
Wei, Hongzhen ; Yu, Jinzhong ; Liu, Zhongli ; Zhang, Xiaofeng ; Shi, Wei ; Fang, Changshui
Author_Institution :
Inst. of Semicond., Acad. Sinica, Beijing, China
fDate :
5/1/2001 12:00:00 AM
Abstract :
Analytical expression of signal bandwidth of general straight and tapered N×N multimode interference (MMI) couplers is presented. The signal bandwidth is characterized as a function of mode relative energy, mode propagation delay time, and mode pulse broadening in the multimode section of MMI coupler. The model is used to evaluate the signal bandwidth of specific couplers. Results indicate that the signal bandwidth decreases seriously with the increase of channel number and channel guide space. Compared with the straight MMI coupler, the tapered MMI coupler has an improved signal bandwidth
Keywords :
integrated optics; light interference; optical communication equipment; optical couplers; optical waveguide theory; wavelength division multiplexing; channel guide space; channel number; improved signal bandwidth; mode propagation delay time; mode pulse broadening; mode relative energy; multimode interference couplers; multimode section; signal bandwidth; straight MMI coupler; straight N×N multimode interference couplers; tapered MMI coupler; tapered N×N multimode interference couplers; Bandwidth; Integrated optics; Interference; Optical crosstalk; Optical devices; Optical fiber couplers; Optical interferometry; Optical waveguide components; Optical waveguides; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
