In a fibre-optic communication network, the wavelength-division multiplexing (WDM) technique enables an expansion
of the data-carrying capacity of optical fibres. This can be achieved by transmitting different channels on a single optical
fibre, with each channel modulating a different wavelength. In order to access and manipulate these channels at a node of
the network, a compact holographic optical switch is designed, modelled, and constructed.
The structure of such a switch consists of a series of optical components which are used to collimate the beam from the
input, de-multiplex each individual wavelength into separated channels, manipulate the separated channels, and reshape
the beam to the output. A spatial light modulator (SLM) is crucial in this system, offering control and flexibility at the
channel manipulation stage, and providing the ability to redirect light into the desired output fibre. This is achieved by
the use of a 2-D analogue phase computer generated hologram (CGH) based on liquid crystal on silicon (LCOS)
technology.
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