Realization of mixed HDWDM transmission system with minimum available channel spacing using different modulation formats

Owing to the rapidly growing capacity requirement for long distance transmission, fiber optic telecommunication are advancing into high data rate and dense channel schemes enabled by wavelength division multiplexing(WDM).It is a technology which combines a number of optical carrier signals into a single optical fiber by using different wavelength of laser light. The latest version of WDM, High Density WDM achieves higher capacity by dividing a wavelength-band into even more channels. Today’s HDWDM system can combine up to 128 or more wavelength onto a single fiber. It is the method to minimize the channel spacing below 100GHz with high speed for data transmission. HDWDM system is still not widespread. The minimum channel spacing at high speed for data transmission is the main advantage which resembled from WDM and DWDM. In this work, the realization of mixed HDWDM transmission system using different modulation formats at 2.5Gbit/s bit rate and determine the channel interval at which successful transmission is possible. Simulation is done by using Optisystem ver.12.