Extremely small multimode interference couplers and ultrashort bends on InP by deep etching

Abstract

DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal. If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement:

Optical multi-mode interference devices based on self-imaging: principles and applications

“…Recently, extremely small paired-interference MMI devices were reported [32]. The 3-dB (cross) couplers, realized in a raised-strip InP-based waveguide, are 107-pm (216-pm) long, and show 0.9-dB (2-dB) excess loss and -28 dB crosstalk.…”

Design and analysis of low loss MMI based 4×4 optical switch using Benes architecture with SOAs

“…Ulrich et al extended the concept to the replication of images of random objects in multimode waveguides and to the possibility of fiber interferometers based on analogous phenomena [2], [3]. In recent years there has been a great interest in multimode interference (MMI) couplers [4] based on self-imaging effects because of their compactness [5], low loss [4][5][6][7], polarization insensitivity [4] and large wavelength bandwidth [7], as well as their large fabricationtolerant power splitting capability [7]. MMI structures have been widely used in a number of applications including optical gates [9], waveguide division multiplexers and demultiplexers [8], Mach-Zehnder modulators and switches [9] and ring lasers [10].…”

Low-loss, compact, and polarization independent PHASAR demultiplexer fabricated by using a double-etch process

“…Vreeburg [13] reported a low-loss PHASAR in a shallowly etched waveguide structure. Extending the technique as proposed in [12] Herben [14] reported a PHASAR in which the shallowly etched low-loss star-coupler of [13] was combined with the deeply etched compact bends of [11] and [15] using a double etch process. The result was a PHASAR that was both compact and had low losses.…”