harsha.cm - Etalon filter (3) ) Etalon filter (N) NOLM...

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Demultiplexer Multiplexer Optical Fibre Etalon filter (3) ) Etalon filter (N) NOLM Optical Receiver. Directional Couplers Electronic data at n bps Computer and Network Engineering Lecturer: Dr. Graham Swift COMMUNICATION MEDIA Assignment: Theoretical evaluation of WDM subsystem
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Date of Submission: 15 th December 2009 Submitted By: NUTUKURTHI SRIHARSHA (18028918) INDEX S.No: Contents: 1. Abstract. 2. Introduction to WDM. 3. Description of the subsystem and the model. 4. Critique using results obtained from the model. 5. Conclusion. References
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Theoretical evaluation of WDM subsystem Abstract: The main aim of the assignment is to evaluate theoretical model of WDM subsystem. Basic requirement of an optical communication system is that it should be capable of conveying messages. These messages may be presented to the optical communication system as an analogue or digital data signal. The optical signal is essentially a high frequency carrier with frequencies at hundreds of terahertz. The message signals are usually of a much lower frequency. The signals are demultiplexed using directional couplers and etalon filters, switched by a non linear optical loop mirror to be subsequently received and converted to an electrical signal WDM is a method of transmitting data from different sources over the same fibre optic link at the same time whereby each data channel is carried on its own unique wavelength. Wavelength Division Multiplexing (WDM) in similarity to Frequency Division Multiplexing (FDM) was developed in late 1980's to exploit the huge bandwidth of the optical fibre. The practical implementation of such a system is both costly and time consuming and needs careful planning to achieve the required performance. The evaluated performance of the WDM sub system is studied below.
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Introduction to WDM Definition: The system in which signals of different wave lengths are multiplexed using some multiplexers into a single optical fibre at the sending end and is transmitted and again demultiplexed at the receiver end and the required output signal is obtained. The figure below describes the general WDM system: 1 1 2 2 3 λ 1, λ 2, λ 3, λ 4,. ...... λ n. 3 4 4 n n The above figure shows the general WDM system with n input signals and n output signals which undergoes multiplexing and are transmitted at transmitting
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end through a single optical fibre with λ 1, λ 2, λ 3, λ 4,. ...... λ n as their wavelengths and are demultiplexed again at the receiver end to get n desired out puts. Basic Operation: System is operated by transmitting different signals of different wavelengths simultaneously through a single optical fibre(shown in figure below). This is achieved first by multiplexing individual signals by using directional couplers in which each laser must emit a light at a particular wavelength, a band of such lasers are multiplexed into a single high band width optical fibre and is expected to be transmitted through it. These combined bands of optical lasers are then demultiplexed at the receiving end by equally
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This note was uploaded on 02/22/2011 for the course CS 541 taught by Professor Dr.marcosrodrigues during the Spring '09 term at SUNY Buffalo.

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harsha.cm - Etalon filter (3) ) Etalon filter (N) NOLM...

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