Time division multiplexing and its application in high-speed optical communication

Date of Completion

January 2002


Engineering, Electronics and Electrical|Physics, Optics




Bit-Rates higher than 10 Gb/s cannot be easily encoded on an optical carrier using direct or external modulation due to the limited speed of the electronic circuits. With specially designed electronics, bit rates up to 40 Gb/s can be achieved. Optical time division multiplexing (OTDM) has been proposed as a technique for enhancing the capacity of high bit-rate, ∼100Gb/s, all-optical transmission links. ^ In order to realize high-speed OTDM systems, ultrashort pulses should be generated. In this work, the gain switching and colliding pulse modelocking techniques has been used to produce ultrashort pulses. The operation principle and simulation of Colliding Pulse Modelocked laser (CPM) are studied OTDM has been used to achieve an 80 GHz multiplexed signal from 10 GHz gain switched laser pulses. The demultiplexing technique is realized using two cascaded LiNbO3 Mach-Zehnder (MZ) modulators. The dispersion-managed soliton is proved to have a tremendous advantage over the ordinary soliton for long-haul transmission systems. Dispersion-managed soliton transmission using variational approach is also studied. ^