Research On Theapplications Of Time-Lens And Time-Prism Inall-Optical Networks

With the advantage of large capacity and high transmission rate, optical fibercommunication technology plays an important role in the field of modern communications.The proposal of all-optical network will give solution to the puzzle of "electronicbottleneck" which restricts the rate of optical transmission network for a long time. Theall-optical network has become an important carrier of communication. Time-lens andtime-prism, working as all-optical signal processing devices, also attract a widespreadattention.The principles of time-lens and time-prism are introduced respectively at the beginningby comparing with the lens and prism in space optics. Then two kinds of structures based ontime-lens are studied. And the realization of all-optical time-frequency Fourier transformsbased on time-lens is discussed. Combining with the conclusions of FRFT, an all-opticalpulse order-reverser is then introduced and verified by both simulation and experiment. Thenan all-optical stack based on the order-reverser is put forward, which may be applied in OPStechnology in the future.On the other hand, an all-optical frequency shifter based on time-prism is introduced,and its driving signal is remodified considering the practical application. It can be applied inROADM nodes of the all-optical networks so as to reduce the effective bandwidth loss of thesystem, which is caused by cascaded filtering. The all-optical frequency shifter is then testedby simulation. Finally, in order to meet the practical needs, a double-shift scheme is given toenhance its practicality.