High Speed OTDM-DWDM Bit Compressed Network for Long-Haul Communication

Abstract

This paper represents an optical communication
network design that incorporates both OTDM and DWDM
techniques which provides up to 240 Gbit/s data transfer rate,
long-haul communication distance of 2700 km with a maximum
number of 384 channels in this designed architecture. Each
channel has a bitrate of 625 Mbit/s that follows optical signal
hierarchy OC-12, STS-12 (SONET ANSI), and STM-4 (SDH
CCITT), and the design maintains standard parameters for
commercially available channel grids at 100 GHz spacing. The
communication is done by Single Mode Fiber (SMF) of 50 km
and Dispersion Compensating Fiber (DCF) of 10 km followed by
one optical amplifier gain in each span. Bit error rate (BER)
remains significantly low while transmission distance for only
OTDM is 18000 km at a BER < 10-12, and for the hybrid
OTDM-DWDM it is 2700 km at a BER < 10-16. Both values are
measured under 128 bits sequence length. Three compression
stages are used for 8 channels each in order to minimize the gap
between bits, and to utilize the space for more channels within a
specific time window.