Phased-array wavelength demultiplexer with flattened wavelength response

Abstract

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PHASAR-based WDM-devices: Principles, design and applications

“…1) Multimode Receiver Guideş. The most simple method is the use of broad (multimode) waveguides at the receiver side [5], [66], [67], [74], [75]. If the focal spot moves along these broad receivers almost 100% of the light will be coupled into the receiver over a considerable part of the receiver aperture, thus causing a flat region in the frequency response as shown in Fig.…”

Arrayed waveguide grating multiplexer with boxlike spectral response

“…In order to reduce the need for accurate wavelength control, some techniques have been proposed to flatten the passband and form the so-called boxlike spectral response of the AWG device [1][2][3][4][5][6]. These techniques include using multimode output waveguides [1], a multimode interference (MMI) coupler in the input waveguide [3], and a triple-Rowland-circle structure [4], and varying the lengths and positions of the arrayed waveguides [6].…”

“…These techniques include using multimode output waveguides [1], a multimode interference (MMI) coupler in the input waveguide [3], and a triple-Rowland-circle structure [4], and varying the lengths and positions of the arrayed waveguides [6].…”

Arrayed‐Waveguide Gratings

“…The simplest method is to use multimode waveguides at the receiver side of an AWG. If the focal spot moves at the AWG output along a broad waveguide, almost 100% of the light is coupled into the receiver to have a flat region of transmission [10]. However, this approach is unfavourable for single-mode systems.…”