The document discusses advanced multiplexing technologies used in optical fiber communication, including Time Division Multiplexing (TDM), Wavelength Division Multiplexing (WDM), Optical Time Division Multiplexing (OTDM), and Subcarrier Multiplexing (SCM). These techniques maximize information transfer by allowing multiple signals to be sent simultaneously over a single fiber link. Applications include long-distance optical networks, increasing existing network capacity, and capacity leasing.

1. Advanced Multiplexing
Technology
ASHISH KUMAR

2. Contents
• Multiplexing
• Types of multiplexing
• WDM Network
• OTD Multiplexing
• Subcarrier Multiplexing
• Applications

3. Multiplexing
•Information transfer over an optical fiber
communication can be maximised by multiplexing
several signals on to a signal fiber.
•These multichannel signals can be multiplexed in
the electric time or frequency domain.

5. Types of multiplexing
Some of the multiplexing techniques used are :
1) TDM- In time division multiplexing pulses from multiple channels are interleaved &
transmitted sequentially, it enhance the bandwidth utilization of a single fiber link.
2) WDM- When number of optical sources operates at different wavelength are to be sent
on single fibre link, wavelength division multiplexing is used.
3) OTDM- The method to increase the bit rate of a digital fiber system that can create
capability beyond the bandwidth available with drive electronics is optical time division
multiplexing.
4) SCM- It involves use of higher frequency microwave subcarriers which are multiplexed
with respect to the frequency.The subcarrier multiplexing can transmit multiple multiple
broadband signals over a single mode fiber.

6. WDM Network
• In WDM, optical signals with number of different peaks wavelengths
are transmitted in parallel over a single optical fiber.
• WDM is used when number of optical sources operates at different
wavelength are to be sent on single fiber link.
• Each intensity modulated channel of the WDM can have access to the
entire fiber bandwidth which can be in the range of several GHz.

8. OTD Multiplexing
• OTD multiplexing means Optical time division multiplexing .
• It is the method to increase the bit rate of a digital fiber system.
• It can create capability beyond the bandwidth available with drive
electronics is termed as optical time division multiplexing.

10. SCM
• SCM means Subcarrier multiplexing which involves use of higher
frequency microwave subcarrier which are multiplexed with respect
to the frequency.
• These multiplexed subcarriers are then applied to intensity modulate
high speed injection laser source.
• SCM can transmit multiple broadband signals over a single mode
fiber.

11. Applications
• Long transportation of optical networks either in point-to-point or
ring topology.
• Expanding the capacity of an existing optical network.
• Capacity leasing for network wholesalers.

12. Thank You !