Advance in Optical Fiber Amplifier
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1Advance in Optical Fiber Amplifier Chun Jiang, Qingji Zeng, Hua Liu, Xiaodong Tang, Xudong Yang Center for Broadband Optical Networking Technology, College of Electronics & Information, Shanghai Jiaotong University, Shanghai 200030, P.R.China ABSTRACT Advances in optical fiber amplifier for optical network are reviewed in this paper. Considerable progress has been made in optical amplifier technology in recent years. The bandwidth of amplifiers has increased several times and flat gain amplifiers with more than 80 nm of bandwidth have been demonstrated. With the advent of Raman fiber amplifiers, more wider bandwidth is obtained. Progress has also been made in the understanding of amplifier gain dynamics. Several control schemes have been successfully demonstrated to mitigate the signal impairments due to fast power transients in a chain of amplifiers and will be implemented in optical network design. Terrestrial optical systems have been increasing in transmission capacity. In this review, we focus on the recent progress in some important aspects of several optical fiber amplifier technology. Keywords: Erbium doped fiber amplifier, Raman fiber amplifier, Optical network 1.INTRODUCTION In the past decades years, tremendous progress has been made in the development of optical amplifier components and technology, including erbium-doped fiber amplifier, Raman fiber amplifier and waveguide amplifier, semiconductor pump lasers, passive components, and splicing and assembly technology. In the research area, Optical amplifier with a bandwidth of 80 nm was achieved for the first time. In the meantime, an enormous effort has been under way to incorporate optical amplifier into commercial optical communication systems. After intensive laboratory research and development, optical amplifiers technology offer an unprecedented cost-effective means to meet the ever-increasing demand for transport capacity, networking functionality, and operational flexibility. In this paper, we focus on the recent progress in some important aspects of several optical fiber amplifier technology. 2.ERBIUM DOPED FIBER AMPLIFIER 2.1 Optical Network Demand An standard EDFA is equipped with the features of gain, noise figure, output power, dynamic range and reliability. In practice, however, different network functions require only some of these features. Amplifier features can generally be divided into static parameters and dynamic parameters. To obtain good static 1: Correspondence Author: Emai1:cjiangonhine.sh.cn; Telephone:0086-021-62932166;Fax:0086-021-62820892. In Rare-Earth-Doped Materials and Devices IV, Shibin Jiang, Editor, 318 Proceedings of SPIE Vol. 3942 (2000) • 0277-786X/O0/$1 5.00
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In pursuit of high transmission capacity, people have been tried many ways. Forexample, they pave more cables or use the TDM (time domain multiplexer) toimprove the transmission capacity. But in these traditional ways, signals couldbecome weaker in power through the fiber link. And the further they are transmitted,the weaker the signals will be until they can not be detected. With the advanced oftechnology, optical amplifier which is a better solution to improve the transmissioncapacity came around. It can strengthen the attenuated signals and even can bringthem back to the original level. And now it is mainly applied in DWDM technologyso that DWDM technology can support long-haul transmission.
Transcript of Advance in Optical Fiber Amplifier
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