Multimode Add-Drop multiplexing by adiabatic linearly tapered coupling
ABSTRACT Multimode multiplexing can potentially replace WDM for implementing multichannel short reach interconnects. Multiple optical modes can thus be exploited as the channels for transferring optical data, where each mode represents an independent data channel. The basic building block of the system is a Mode Add/Drop which can be implemented based on adiabatic power transfer. We propose a new scheme for realization of such adiabatic mode add drop with a predefined coupling profile, and demonstrate it by employing a linearly decreasing coupling coefficient along the propagation length. Realization using Silicon-On- Insulator (SOI) platform is discussed - which offers the possibility of direct integration of the optoelectronic circuitry with the Si processor.
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- "An attractive alternative to WDM is the mode division multiplexing (MDM) , in which each mode represents an independent data channel. Several basic building blocks for MDM, such as the mode add/drop multiplexer  and the mode generator , have been proposed. A common feature of these devices is that adiabatic design schemes were used. "
ABSTRACT: We discuss the design of a mode converter based on optical analogy of adiabatic passage via a level crossing in multimode waveguides. Computer-generated planar holograms are used to implement the chirped gratings that mimic the laser excitation used in the transfer between quantum states of atoms and molecules. The mode coupling properties are analyzed using the coupled mode theory and shown to resemble the level crossing process. Key features of the devices are illustrated with theoretical calculations and numerical examples. The proposed mode converter shows a bandwidth in excess of 300 nm in the optical communications band.IEEE Photonics Technology Letters 07/2011; 23(12-23):807 - 809. DOI:10.1109/LPT.2011.2138127 · 2.11 Impact Factor
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ABSTRACT: For the potential realization of optical interconnect scheme based on modal diversity, we propose and analyze efficient mode add drop multiplexers (MADM). Each of the two types of MADM proposed here enables a simultaneous two channels (modes) add/drop to/from a multimode bus. The simultaneous operation is of importance in reducing the device footprint within the expected ultra-dense interconnects schemes. We developed analytical design rules for the adiabatic devices and verified by simulation that an implementation based on Silicon over Insulator waveguides, is exhibiting low loss and low channels crosstalk (below −22 dB).Optics Communications 10/2006; 266(2):527-531. DOI:10.1016/j.optcom.2006.05.034 · 1.45 Impact Factor
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ABSTRACT: Optical waveguide switches based on spatial arrangements inspired by electromagnetic induced transparency (EIT) concepts are presented. Interferometric control of optical signal by an optical gate is accomplished in three configurations. The first is employing a direct spatial version of EIT, the second is exploiting space reciprocity to accomplish performance not achievable in the time domain EIT and finally a novel version of EIT, using tunneling, is transformed into the spatial domain. For all configurations - closed form analysis as well as actual device simulation are presented.Optics Express 12/2006; 14(23):11312-7. DOI:10.1364/OE.14.011312 · 3.49 Impact Factor