Optimal design, fabrication, and characterisation of GeO<sub>2</sub>-SiO<sub>2</sub> doped silica multimode-interference couplers

H. N. J. Fernando; M. Hayden; P. J. Hughes

doi:10.1117/12.662860

20 April 2006 Optimal design, fabrication, and characterisation of GeO₂-SiO₂ doped silica multimode-interference couplers

H. N. J. Fernando, M. Hayden, P. J. Hughes

Author Affiliations +

Proceedings Volume 6183, Integrated Optics, Silicon Photonics, and Photonic Integrated Circuits; 61830V (2006) https://doi.org/10.1117/12.662860
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

Article reports low loss (better than 0.09dB/cm) germano-silicate planar devices, operating at 1550nm wavelength, with optical combiner/splitters exhibiting greater splitting uniformity (~ 0.08dB) based on multimode interferences with index contrast ~ 0.7%. Excess loss of the device was improved by 0.41dB by designing output access waveguides with two S-bends operating in the Whispering-Gallery-Mode regime (WGM). The total S-bend loss was improved by inserting a straight waveguide between two cured sections, instead of two oppositely curved sections as in the conventional S-bends. This is expected to reduce transition loss about four times the transition loss between two oppositely curved sections. Optimised offsets, between waveguides of different radii, and widening of curved sections resulted in low excess loss while preserving device compactness. The separation of the output access waveguides was limited to just 250μm, for pigtailing/butt-coupling of SMF fibres, to ensure device compactness for future high-density packaging. Silica and doped-silica on silicon films were formed at low temperature, <350°C, with high deposition rates, greater than 1600 Angstroms/min, using plasma enhanced chemical vapour deposition (PECVD) technology that suits for mass production. Fabricated lightwave circuits were characterised with special care in order to avoid ambiguities that would arise from power fluctuation in the launching laser source during measurements.

Citation Download Citation

H. N. J. Fernando, M. Hayden, and P. J. Hughes "Optimal design, fabrication, and characterisation of GeO₂-SiO₂ doped silica multimode-interference couplers", Proc. SPIE 6183, Integrated Optics, Silicon Photonics, and Photonic Integrated Circuits, 61830V (20 April 2006); https://doi.org/10.1117/12.662860

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Brain-machine interfaces

Waveguides

Plasma enhanced chemical vapor deposition

Photonic integrated circuits

Silica

Ions

Single mode fibers

Show All Keywords

Keywords/Phrases

Search In:

Publication Years