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Optical waveguide structures such as Multimode inference (MMI) structures, Y-connectors, splitters, couplers, multiplexers, switches and combiners are widely used for different applications. In this paper, we demonstrate the analytical analysis of effect of phase shifting in multimode inference devices, based on self imaging. This paper shows how self images changes when we introduce phase shift in...
We consider a cognitive radio scenario in which two networks share a licensed spectrum. Primary network is the legitimate network while cognitive radio network utilizes the underutilized frequency sub bands. For this scenario our focus is primarily on controlling the interference to the legitimate user and in addition, to minimize the interference between the secondary users while assuring quality...
In this paper, the mode coupling between a single-mode waveguide and a Multi-Mode Interference (MMI) waveguide is analyzed under two conditions. First, mode coupling efficiency vs. the distance between two waveguides is calculated while only direct phase matching condition between various modes is in effect. In the second case a Bragg grating is introduced between the waveguides and we show that the...
Multimode Interference Devices (MMI) play an important role in optical switches and power splitters. The MMI work on the formation of self-images of any input optical field at various distances along the optical axis of MMI. The length Lπ is an important parameter to calculate the distances where these self-images will be formed. In this paper we show that the calculations of Lπ given in [1] are only...
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