The University of Southampton
University of Southampton Institutional Repository

Micromachined multimode interference device in flat-fiber

Ambran, S., Holmes, C., Gates, J.C., Webb, A.S., Smith, P.G.R. and Sahu, J.K. (2010) Micromachined multimode interference device in flat-fiber At Photonics Global Conference, Singapore. 14 - 16 Dec 2010. (doi:10.1109/PGC.2010.5705970).

Record type: Conference or Workshop Item (Paper)


A novel flat-fiber platform is presented for fabricating integrated optical multimode interference (MMI) devices. Fabrication is achieved by modifying a standard optical fiber drawing process and applying a micromachining technique. The fabricated structure consists of an MMI region within the flat-fiber that is defined by micromachined trenches, illustrated in Figure 1(a). A 1x3 splitter has been demonstrated, with a spatial output mode that be tuned by placing refractive index oils within the micromachined trenches.
MMI devices have been demonstrated in different planar platforms such as silicon-on-insulator and silica-on-silicon. However, many of these materials are potentially expensive, high loss or have a complex fabrication process. The desire to have a fiber-like platform, capable of supporting multiple waveguides in a planar format, led us to develop a novel silica optical flat-fiber technology. This allows us to overcome the limitations of existing planar technologies by offering a low cost, low loss substrate with fiber-like flexibility, long lengths and the ability to make integrated devices. The flat-fiber substrate is fabricated using standard silica fiber fabrication but differs by collapsing the preform during the fiber drawing stage by using a vacuum. The trenches of the device were diced using an ultra-precision micromachining technique.

Text 4865.pdf - Other
Download (134kB)

More information

e-pub ahead of print date: December 2010
Published date: December 2010
Venue - Dates: Photonics Global Conference, Singapore, 2010-12-14 - 2010-12-16
Organisations: Optoelectronics Research Centre


Local EPrints ID: 340029
PURE UUID: cd2c9c5c-fb1f-4c52-bb53-7e41dce5bc92
ORCID for J.C. Gates: ORCID iD

Catalogue record

Date deposited: 07 Jun 2012 12:21
Last modified: 20 Oct 2017 16:35

Export record



Author: S. Ambran
Author: C. Holmes
Author: J.C. Gates ORCID iD
Author: A.S. Webb
Author: P.G.R. Smith
Author: J.K. Sahu

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.