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Journals & Magazines >Journal of Lightwave Technology >Volume: 23 Issue: 3

A wavelength-tunable optical transmitter using semiconductor optical amplifiers and an optical tunable filter for metro/access DWDM applications

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Jun-ichi Kani; K. Iwatsuki
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Abstract:

This paper proposes and demonstrates a widely tunable and precisely controllable optical transmitter that uses semiconductor optical amplifiers (SOAs) and an optical tuna...Show More

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Abstract:

This paper proposes and demonstrates a widely tunable and precisely controllable optical transmitter that uses semiconductor optical amplifiers (SOAs) and an optical tunable filter (OTF) for metro/access dense-wavelength-division-multiplexing (DWDM) systems/networks. The transmitter consists of a fiber-ring-laser section based on SOA(s) and an OTF and a modulation section based on an SOA. First, the requirements imposed on the components intended for the fiber-ring laser are clarified through approximate analyses and basic experiments. To obtain low-noise characteristics, the lower limit of effective OTF bandwidth is investigated by considering the SOA carrier lifetime. For obtaining wavelength precision, the upper limit of the effective OTF bandwidth is derived by considering the SOA ripple effect. Next, the proposed transmitter is demonstrated, where all SOAs are integrated into one planar lightwave circuit (PLC) platform using spot-size converting technology. By designing the fiber-ring-laser section according to the clarified requirements, a wavelength control precision of /spl plusmn/1.75GHz is achieved while realizing the required relative intensity noise (RIN) from 1540 to 1560 nm. Finally, it is demonstrated that the transmitter can handle signals at up to 1.25 Gb/s.
Published in: Journal of Lightwave Technology ( Volume: 23, Issue: 3, March 2005)
Page(s): 1164 - 1169
Date of Publication: 31 March 2005

ISSN Information:

DOI: 10.1109/JLT.2005.843497
Author image of Jun-ichi Kani
NTT Access Network Service Systems Laboratories, NTT Corporation, Chiba, Japan
Jun-ichi Kani (M'98) received the B.E. and M.E. degrees in applied physics from Waseda University, Tokyo, Japan, in 1994, and 1996, respectively.
In 1996, he joined the NTT Laboratories, Yokosuka, Japan, where he has been engaged in research on optical network systems for core and access applications. In 2003, he joined NTT Access Network Service Systems Laboratories, Chiba, Japan.
Mr. Kani a Member of the Institute of Elec...Show More
Jun-ichi Kani (M'98) received the B.E. and M.E. degrees in applied physics from Waseda University, Tokyo, Japan, in 1994, and 1996, respectively.
In 1996, he joined the NTT Laboratories, Yokosuka, Japan, where he has been engaged in research on optical network systems for core and access applications. In 2003, he joined NTT Access Network Service Systems Laboratories, Chiba, Japan.
Mr. Kani a Member of the Institute of Elec...View more
Author image of K. Iwatsuki
NTT Access Network Service Systems Laboratories, NTT Corporation, Chiba, Japan
Katsumi Iwatsuki (M'03) received the B.E. degree in electronics engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 1981 and M.E. and Ph.D. degrees in electronics engineering from the University of Tokyo, Tokyo, Japan, in 1983 and 1986, respectively.
In 1986, he joined NTT Laboratories, Yokosuka, Japan, where he was engaged in research on optical fiber sensors, optical soliton transmission, and ultra-hig...Show More
Katsumi Iwatsuki (M'03) received the B.E. degree in electronics engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 1981 and M.E. and Ph.D. degrees in electronics engineering from the University of Tokyo, Tokyo, Japan, in 1983 and 1986, respectively.
In 1986, he joined NTT Laboratories, Yokosuka, Japan, where he was engaged in research on optical fiber sensors, optical soliton transmission, and ultra-hig...View more
Contents

I. Introduction

Wavelength-Tunable optical transmitters offer advanced flexibility in dense-wavelength-divisionmultiplexing (DWDM) systems/networks. They can be used as common spare/inventory transmitters for various wavelength channels in DWDM systems, as well as optical transmitters/wavelength converters in reconfigurable DWDM networks [1]. They also offer the possibility of being used in wavelength-independent optical network units (ONUs) in DWDM-based optical access networks [2]. Typical Characteristics of Wavelength-Tunable Lasers for DWDM Metro/Access Applications

ItemsCharacteristics
Relative intensity noise (RIN) <-130 dB/Hz…values without inducing optical-SNR degradation at BER of 10–12 for 1.25 Gbps
Wavelength preciseness < 2 G Hz…for DWDM with channel spacing of 25 GHz or over

Author image of Jun-ichi Kani
NTT Access Network Service Systems Laboratories, NTT Corporation, Chiba, Japan
Jun-ichi Kani (M'98) received the B.E. and M.E. degrees in applied physics from Waseda University, Tokyo, Japan, in 1994, and 1996, respectively.
In 1996, he joined the NTT Laboratories, Yokosuka, Japan, where he has been engaged in research on optical network systems for core and access applications. In 2003, he joined NTT Access Network Service Systems Laboratories, Chiba, Japan.
Mr. Kani a Member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan. He received the Best Paper Award from the Second and Third Optoelectronics and Communications Conference (OECC) in 1997 and in 1998, the Best Paper Award from the European Conference on Networks and Optical Communications (NOC) in 1998, the Asia-Pacific Conference on Communications (APCC)/IEEE ComSoc Asia Pacific Board Joint Award in 2001, and the Young Scientist Award from IEEE Lasers & ElectroOptics Society (LEOS) Japan Chapter in 2003.
Jun-ichi Kani (M'98) received the B.E. and M.E. degrees in applied physics from Waseda University, Tokyo, Japan, in 1994, and 1996, respectively.
In 1996, he joined the NTT Laboratories, Yokosuka, Japan, where he has been engaged in research on optical network systems for core and access applications. In 2003, he joined NTT Access Network Service Systems Laboratories, Chiba, Japan.
Mr. Kani a Member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan. He received the Best Paper Award from the Second and Third Optoelectronics and Communications Conference (OECC) in 1997 and in 1998, the Best Paper Award from the European Conference on Networks and Optical Communications (NOC) in 1998, the Asia-Pacific Conference on Communications (APCC)/IEEE ComSoc Asia Pacific Board Joint Award in 2001, and the Young Scientist Award from IEEE Lasers & ElectroOptics Society (LEOS) Japan Chapter in 2003.View more
Author image of K. Iwatsuki
NTT Access Network Service Systems Laboratories, NTT Corporation, Chiba, Japan
Katsumi Iwatsuki (M'03) received the B.E. degree in electronics engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 1981 and M.E. and Ph.D. degrees in electronics engineering from the University of Tokyo, Tokyo, Japan, in 1983 and 1986, respectively.
In 1986, he joined NTT Laboratories, Yokosuka, Japan, where he was engaged in research on optical fiber sensors, optical soliton transmission, and ultra-high-speed nonlinear pulse transmission. Since 1999, he has been engaged in research on metropolitan and access area network technologies and currently heads the WDM Access Group in the NTT Access Network Service Systems Laboratories.
Dr. Iwatsuki is a Member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan. He received the Young Engineers Award from the IEICE in 1991 and the Asia-Pacific Conference on Communications (APCC)/IEEE ComSoc Asia Pacific Board Joint Award in 2001.
Katsumi Iwatsuki (M'03) received the B.E. degree in electronics engineering from the Nagoya Institute of Technology, Nagoya, Japan, in 1981 and M.E. and Ph.D. degrees in electronics engineering from the University of Tokyo, Tokyo, Japan, in 1983 and 1986, respectively.
In 1986, he joined NTT Laboratories, Yokosuka, Japan, where he was engaged in research on optical fiber sensors, optical soliton transmission, and ultra-high-speed nonlinear pulse transmission. Since 1999, he has been engaged in research on metropolitan and access area network technologies and currently heads the WDM Access Group in the NTT Access Network Service Systems Laboratories.
Dr. Iwatsuki is a Member of the Institute of Electronics, Information and Communication Engineers (IEICE) of Japan. He received the Young Engineers Award from the IEICE in 1991 and the Asia-Pacific Conference on Communications (APCC)/IEEE ComSoc Asia Pacific Board Joint Award in 2001.View more
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