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Title: | Wavelength Division Multiplexed Optical Fibre System |
Authors: | Sinclair, William J. |
Advisor: | Straus, J. |
Department: | Engineering Physics |
Publication Date: | Mar-1980 |
Abstract: | <p>The design, construction techniques and results of evaluation of two types of optical fibre multiplexing and demultiplexing devices are given.</p> <p>The first type of device is a three channel optical multiplexer/demultiplexer operating in the 750 to 900 nm band. This device allows the simultaneous transmission of 3 different wavelengths through the same optical fibre. It employs a diffraction grating, in the Littrow configuration, as the wavelength selective element. The device is compact and rugged due to the use of a gradient index lens to which the other assemblies are cemented. The wavelength channels have centre wavelengths of 790, 830 and 870 nm and are nominally 30 nm wide at the -1 dB points. The loss is 2.2 to 2.5 dB when used as a demultiplexer and 7 to 8 dB when used as a multiplexer. Crosstalk is less than -30 dB at the channel centres.</p> <p>The other device is a two channel multiplexer-demultiplexer which allows a bidirectional system to be constructed. This device has a short wavelength channel from 770 to 890 nm and a long wavelength channel from 1100 to 1400 nm. It employs an interference filter as the wavelength selective element. The filter is cemented between two gradient index lenses to form a compact rugged device. The loss is 1.5 dB for the 770 to 890 nm wavelength channel and 3.5 dB for the 1100 to 1400 nm wavelength channel.</p> <p>Combining the two and three channel devices results in a four channel bidirectional system for use in integrated distribution services.</p> <p>Suggestions for improvements in the design and construction of the devices are also given.</p> |
Description: | Title: Wavelength Division Multiplexed Optical Fibre System, Author: William J. Sinclair, Location: Thode |
URI: | http://hdl.handle.net/11375/20173 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Sinclair_William_J_1980_03_master.pdf | Title: Wavelength Division Multiplexed Optical Fibre System, Author: William J. Sinclair, Location: Thode | 12.4 MB | Adobe PDF | View/Open |
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