Abstract: Optical time division Multiplexing (OTDM) is well known techniques of Electrical time division multiplexing into optical domain. Time multiplexing is used to construct optical streams in OTDM. In this paper, an overview of recent work show the multiplexing and de-multiplexing of incoming data. In this, lower bits (10GBits/S) constructed to a higher bits i.e. (40GBits/S) by multiplexing process. The pulses streams are delayed with respect to one another using delay element. The Delay streams in picosecond order. The de-multiplexing reconstructs the bit streams at the original bit rate (10GBits/s) by separating bits in the multiplexed streams. The Bits are transmitted over long distance using single fiber. In this paper we verified by the results that at the receiver end each bits are separated and show their property such as Q factor, Power, Wavelength, Power Penality etc. On Increasing distance that will decreased power penality means at the receiver end the noise is decreased. Data is transmitted 80 Km using single mode fiber.

Keywords: AM Modulator, NRZ Pulse, Multiplexer, De-multiplexer, loop control, EDFA, Clock recovery.