Abstract
A 1.31/1.55 microm multimode interference based wavelength demultiplexer aided by computer-generated planar holograms is proposed. The device length is not limited to the common multiples of the beat lengths for the two wavelengths. The demultiplexer length is chosen as the first self-imaging length for 1.55 microm input, and a computer-generated holographic pattern is used to image the 1.31 microm input to the cross output port. The design and optimization of the holographic pattern is presented. The device performance is investigated using the beam propagation method.
Highlights
Wavelength division multiplexing (WDM) is a key technology in optical fiber communication systems [1]
We have proposed a class of devices using computer-generated planar holograms (CGPHs) on multimode waveguides to perform various functionalities [11,12,13,14,15]
We show that, with a properly designed CGPH on the multimode interference (MMI), the 1.31 μm input can be imaged to the cross output port
Summary
Wavelength division multiplexing (WDM) is a key technology in optical fiber communication systems [1]. Several groups [5,6] have demonstrated wavelength demultiplexers for the 1.31 and 1.55 μm based on MMI. A MMI based multiplexer/demultiplexer with fewer restrictions on its geometry would be desirable in terms of design freedom. We have proposed a class of devices using computer-generated planar holograms (CGPHs) on multimode waveguides to perform various functionalities [11,12,13,14,15]. These CGPHs are multiplexed long-period gratings that couple and transform the guided modes of the multimode waveguides. The design and optimization procedure of the CGPH is presented, and the device performance is investigated with numerical simulations
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