Study of methods of optical signal separation using passive optical fibre devices

Abstract

This report describes the project on studying various methods of separating a narrow band optical signal from a broad band source by using passive optical fibre devices. In other words, a notch filter is to be designed to avoid coherent interference effect in an optical fibre system having a large path difference. Four methods have been suggested to be built and tested. The first was done by using a grating monochromator, the second by a fibre grating, the third by a long coupling length optical coupler and the last one using a chemical substance. Out of four, only the first three was actually carried out. The fourth method was skipped due to high toxicity in the chemical substance which needs extremely high precautions and careful steps in order to conduct the experiment. The experiment was aimed to block the narrow band light source at wavelength centred on 1550 nm ± 50 nm. It was found out that the second method which used fibre grating turned out to be the best way in achieving this aim.

A project submitted for the award of B Eng. Electronic Engineering supervised by Dr.J.P.Dakin

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