Novel usage of erbium in optical communication systems – From fundamentals to performance characteristics

Shankar S. Pathmanathan, Pankaj Kumar Choudhury

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The twentieth century has witnessed phenomenal growth in silicon-based semiconductor technology. This revolution, however, will be dwarfed by photonics technology in the twenty first century. In this respect, erbium − a rare-earth element on the lanthanide series − will be to photonics technology what silicon is to semiconductor technology. In this article, spotlight shines on the novel usage of erbium in amplifying optical signals – a much desired phenomenon implemented in optical communication systems. Due to various loss mechanisms, there is a gradual reduction in the power of light as it propagates through a communication channel, and to recover that, amplification of light becomes vital. Further, this remains much important in order for the information carried by the light to be discernible at the receiving end as there exists a minimum threshold power which the light must always possess. Erbium-doped fiber amplifier (EDFA) is an all-optical type of device for combating attenuation in optical communication systems wherein amplification performs totally in the optical domain via stimulated emission. In this article, starting from the fundamental concepts in the context of EDFAs, a thorough description is made incorporating the advancements in the area. In this regard, basic concepts of modeling the EDFA characteristics remain vital – the technique which involves non-linear rate and propagation equations, the solutions to which are carried out numerically by the use of the forth order Runge-Kutta method. The associated boundary value problem is then solved by using the relaxation method. The results show the important device performance characteristics of gain and noise figure with respect to three main input design parameters − pump power, signal wavelength and input signal power. The article also involves experimental investigations of EDFA in the C-band (1530 nm − 1565 nm). In this context, performance characteristics for various system configurations are illustrated considering different types of pumping schemes viz. co- and counter-propagations of the pump and the signal. Primary performance characteristics of EDFA under different configurations are discussed in terms of gain and noise figure. It has been observed that the most appreciable values of gain are obtained corresponding to the double-pass configuration with a tunable band-pass filter in the optical circuit. However, for a given configuration, pumping schemes are hardly found to play a significant role towards the improvement in gain or reduction in noise figure.

Original languageEnglish
Title of host publicationErbium
Subtitle of host publicationCompounds, Production and Applications
PublisherNova Science Publishers, Inc.
Pages1-108
Number of pages108
ISBN (Electronic)9781617284403
ISBN (Print)9781616689896
Publication statusPublished - 1 Jan 2010

Fingerprint

Erbium
Erbium doped fiber amplifiers
Optical communication
Communication systems
Noise figure
Silicon
Photonics
Amplification
Pumps
Communication channels (information theory)
Semiconductor materials
Lanthanoid Series Elements
Stimulated emission
Runge Kutta methods
Bandpass filters
Rare earth elements
Boundary value problems
Wavelength
Networks (circuits)

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Pathmanathan, S. S., & Choudhury, P. K. (2010). Novel usage of erbium in optical communication systems – From fundamentals to performance characteristics. In Erbium: Compounds, Production and Applications (pp. 1-108). Nova Science Publishers, Inc..

Novel usage of erbium in optical communication systems – From fundamentals to performance characteristics. / Pathmanathan, Shankar S.; Choudhury, Pankaj Kumar.

Erbium: Compounds, Production and Applications. Nova Science Publishers, Inc., 2010. p. 1-108.

Research output: Chapter in Book/Report/Conference proceedingChapter

Pathmanathan, SS & Choudhury, PK 2010, Novel usage of erbium in optical communication systems – From fundamentals to performance characteristics. in Erbium: Compounds, Production and Applications. Nova Science Publishers, Inc., pp. 1-108.
Pathmanathan SS, Choudhury PK. Novel usage of erbium in optical communication systems – From fundamentals to performance characteristics. In Erbium: Compounds, Production and Applications. Nova Science Publishers, Inc. 2010. p. 1-108
Pathmanathan, Shankar S. ; Choudhury, Pankaj Kumar. / Novel usage of erbium in optical communication systems – From fundamentals to performance characteristics. Erbium: Compounds, Production and Applications. Nova Science Publishers, Inc., 2010. pp. 1-108
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