Tunable cyclic wavelength shifter by use of the polymer holographic grating for optical CDMA applications

Optical code division multiple access (O-CDMA) technique, which is considered as one of the most robust multiple-access techniques for future all-optical network has been studied in many groups. To make O-CDMA system more applicable for networks and switching, rapidly-tunable O-CDMA codes are required. The conventional coders have been reported including fiber Bragg gratings, arrayed-waveguide grating (AWG) devices and optical delay lines. And different types of CDMA coders are being proposed in many research groups. But among them, there are few coders which are freely tunable in real communication. In this paper, we propose an application of the polymer holographic grating as a tunable encoder or label swapper in O-CDMA systems. The polymer holographic grating can be an attractive approach to the spread-space, spread-spectrum CDMA systems or other combined types. The polymer holographic grating can be used for spreading and dispreading the energy of the information signal over a larger and smaller spatial domain in holographic or spread-space CDMA systems, which can be useful wireless optical communication systems. And also, it can be used in other types of CDMA systems. An application of the cyclic property of the proposed device will also be discussed.

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