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Frequency drift characterisation of directly modulated SGDBR tunable lasers

Maher, Robert D. and Anandarajah, Prince M. and Kaszubowska-Anandarajah, Aleksandra and Barry, Liam P. (2007) Frequency drift characterisation of directly modulated SGDBR tunable lasers. In: LEOS 2007 - IEEE Lasers and Electro-Optics Society Annual Meeting Conference Proceedings, 21-25 Oct 2007 , Lake Buena Vista, FL , USA.

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Abstract

Tunable Lasers (TL) are rapidly becoming key components in Dense Wavelength Division Multiplexed (DWDM) systems, packet switched schemes and access networks. They are being introduced as alternatives to fixed wavelength sources to provide a greater degree of flexibility and to reduce large inventory [1]. The SGDBR laser is an ideal candidate due to its large tuning range (40 nm), high output power (10 dBm), large Side Mode Suppression Ratio (>30 dB) and its ability to be monolithically integrated with other semiconductor devices. Such integration could comprise of a Semiconductor Optical Amplifier (SOA), allowing for extended reach tunable operation, in a very compact and low cost footprint [2]. Thus far, external modulation has been the most popular modulation technique used with TLs. However, the addition of the modulator introduces loss to the transmitted signal due to high insertion and coupling losses. Addressing these short comings would result in increased cost and complexity of the transmitter. Alternatively, direct modulation is one of the simplest and cost efficient ways to modulate the lightwave signal. Hence, it is rational to investigate the performance of a directly modulated SGDBR laser in order to verify its usefulness in a WDM based access network scenario. Previous work in this area has mainly focused on bandwidth characterisation and transmission experiments [3, 4]. In this paper, we characterise the frequency drift associated with a directly modulated SGDBR laser incorporating a wavelength locker. Focus is placed on investigating the magnitude and settling time of this drift. In addition, we also demonstrate how the frequency drift has a detrimental effect on DWDM system performance when the modulated channel is passed through a narrow Optical Band-Pass Filter (OBPF) centred at the target emission frequency.

Item Type:Conference or Workshop Item (Paper)
Event Type:Conference
Refereed:Yes
Subjects:Engineering > Optical communication
Physical Sciences > Lasers
DCU Faculties and Centres:DCU Faculties and Schools > Faculty of Engineering and Computing > School of Electronic Engineering
Research Initiatives and Centres > Research Institute for Networks and Communications Engineering (RINCE)
Publisher:Institute of Electrical and Electronics Engineers
Official URL:http://dx.doi.org/10.1109/LEOS.2007.4382496
Copyright Information:©2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
ID Code:2305
Deposited On:16 Jan 2009 11:22 by DORAS Administrator. Last Modified 06 Sep 2010 13:47

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