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Proceedings Paper

InP-based monolithically integrated 1310/1550nm diplexer/triplexer
Author(s): C. Silfvenius; M. Swillo; J. Claesson; E. Forsberg; N. Akram; M. Chacinski; L. Thylén
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Paper Abstract

Multiple streams of high definition television (HDTV) and improved home-working infrastructure are currently driving forces for potential fiber to the home (FTTH) customers [1]. There is an interest to reduce the cost and physical size of the FTTH equipment. The current fabrication methods have reached a cost minimum. We have addressed the costchallenge by developing 1310/(1490)/1550nm bidirectional diplexers, by monolithic seamless integration of lasers, photodiodes and wavelength division multiplexing (WDM) couplers into one single InP-based device. A 250nm wide optical gain profile covers the spectrum from 1310 to 1550nm and is the principal building block. The device fabrication is basically based on the established configuration of using split-contacts on continuos waveguides. Optical and electrical cross-talks are further addressed by using a Y-configuration to physically separate the components from each other and avoid inline configurations such as when the incoming signal travels through the laser component or vice versa. By the eliminated butt-joint interfaces which can reflect light between components or be a current leakage path and by leaving optically absorbing (unpumped active) material to surround the components to absorb spontaneous emission and nonintentional reflections the devices are optically and electrically isolated from each other. Ridge waveguides (RWG) form the waveguides and which also maintain the absorbing material between them. The WDM functionality is designed for a large optical bandwidth complying with the wide spectral range in FTTH applications and also reducing the polarization dependence of the WDM-coupler. Lasing is achieved by forming facet-free, λ/4-shifted, DFB (distributed feedback laser) lasers emitting directly into the waveguide. The photodiodes are waveguide photo-diodes (WGPD). Our seamless technology is also able to array the single channel diplexers to 4 to 12 channel diplexer arrays with 250μm fiber port waveguide spacing to comply with fiber optic ribbons. This is an important feature in central office applications were small physical space is important.

Paper Details

Date Published: 18 November 2008
PDF: 12 pages
Proc. SPIE 7135, Optoelectronic Materials and Devices III, 71351Q (18 November 2008); doi: 10.1117/12.803366
Show Author Affiliations
C. Silfvenius, PhoXtal Communications (Sweden)
M. Swillo, PhoXtal Communications (Sweden)
J. Claesson, PhoXtal Communications (Sweden)
E. Forsberg, PhoXtal Communications (Sweden)
N. Akram, Univ. College VestFold (Norway)
M. Chacinski, Royal Institute of Technology (Sweden)
L. Thylén, PhoXtal Communications (Sweden)
Royal Institute of Technology (Sweden)
Kista Photonics Research Ctr. (Sweden)

Published in SPIE Proceedings Vol. 7135:
Optoelectronic Materials and Devices III
Yi Luo; Jens Buus; Fumio Koyama; Yu-Hwa Lo, Editor(s)

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