Abstract
In this paper, gain flatness is studied for simultaneous 16-ITU-T channel amplifications at C-band (1,532–1,558 nm) in a single stage EDFA for WDM application at different average inversion levels. The inversion levels are varied due to the change of the input signal levels from the targeted operating point and also for dropping few numbers of channels. Specially designed gain flattening filter (GFF) is used in order to get the flat gain with gain variation ±0.5 dB for −20 dBm/ch input signal power (total input signal power is −8.0 dBm) at a fixed average inversion level which is maintained by proper selection of optimum fibre length and pump power. A specific loss spectrum of GFF is obtained by writing a chirped fibre Bragg grating of length 20 mm. Gain variations are studied by changing the total input signal levels from −8.0 dBm to −20.0 dBm and maintained within 20.0 ± 0.5 dB by using automatic gain control (AGC) circuit. About 15 out of 16 channels are dropped and observed ± 0.5 dB gain-variation which is an important parameter in optical network system.
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References
Becker, P.C., Olsson, N.A., Simpson, J.R.: In: Kelly, P.L. (ed.) Erbium–Doped Fibre Amplifiers—Fundamentals and Technology (1999)
Bhadra S.K., Sen R., Pal M.: Development of rare-earth doped fibres for amplifiers in WDM systems. IEE Proc. Circ. Dev. Syst. 150, 480–485 (2003)
Dhar A., Paul M.Ch., Pal M., Mondal A.Kr., Sen S., Maiti H.S., Sen R.: Characterization of porous core layer for controlling rare earth incorporation in optical fiber. Opt. Exp. 14, 9006–9015 (2006)
Giles R.C., Desurvire E.: Modeling erbium-doped fiber amplifiers. J. Lightwave Technol. 9, 271–283 (1991)
Digonnet, M.J.F. (ed.): Rare-Earth-Doped Fiber Lasers and Amplifiers, 2 edn. Revised and Expanded, Marcel Dekker, Inc. (2001)
Kakui M., Kashiwada T., Onishi M., Shigematsu M., Nishimura M.: Gain-flattened hybrid silica-based Er-doped fiber amplifiers designed for more than 25nm-bandwidth without gain equalizers. Tech. Dig. Opt. Ampl. Appl. TuD4 16, 177–180 (1997)
Karasek M., Valles J.A.: Analysis of channel addition/removal response in all-optical gain-controlled cascade of erbium-doped fiber amplifiers. J. Lightwave Technol. 16, 1795–1802 (1998)
Nusinsky I., Hardy A.A.: Multichannel amplification in strongly pumped EDFAs. J. Lightwave Technol. 22, 1946–1952 (2004)
Pal M., Sen R., Paul M.C., Bhadra S.K., Chatterjee S., Ghosal D., Dasgupta K.: Investigation of the deposition of porous layers by the MCVD method for the preparation of rare-earth doped cores of optical fibers. Opt. Commun. 254, 88–95 (2005)
Pal M., Paul M.C., Dhar A., Pal A., Sen R., Dasgupta K., Bhadra S.K.: Investigation of the optical gain and noise figure for multi-channel amplification in EDFA under optimized pump condition. Opt. Commun. 273, 407–412 (2007)
Rochette, M., Guy, M., Lauzon, J., LaRochelle, S., Trepanier, F.: High-performance optical amplifier for WDM communication systems. ICAPT 98, (1998)
Vengsarkar A.M., Pedrazzani J.R., Judkins J.B., Lemaire P.J.: Long-period fiber-grating-based gain equalizers. Opt. Lett. 21, 336–338 (1996)
Wang, B.S., Puc, G., Osnato, R., Palsdottir, B.: Characterization of gain spectral variation of erbium-doped fibers codoped with aluminum. SPIE APOC 03 (2003)
Wang, B.S., Puc, G., Andrejco, M.: Novel erbium doped fiber for high power applications. SPIE APOC 04 (2004)
Yamada M., Kanamori T., Terunuma Y., Oikawa K., Shimuzu M., Sudo S., Sagawa K.: Fluoride-based erbium-doped fiber amplifier with inherently flat gain spectrum. IEEE Photon. Technol. Lett. 8, 882–884 (1996)
Yeh C.H., Lai K.H., Lee C.C., Chi S.: Simultaneously gain-flattening and gain-clamping technique for erbium-doped fiber amplifiers by backward injection of a Fabry–Perot laser light. Jpn. J. Appl. Phys. 43, 4238–4239 (2004)
Yu A.: Design and modeling of laser-controlled erbium-doped fiber amplifiers. IEEE J. Select. Quant. Electron. 3, 1013–1018 (1997)
Yuxing J.B., Minasian R.: Modeling and optimization of add-drop dynamics in gain-clamped fiber amplifiers. Appl. Opt. 39, 4270–4277 (2000)
Zimmerman D.R., Spiekmann H.S.: Amplifiers for the masses: EDFA, EDWA, and SOA amplets for metro and access applications. J. Lightwave Technol. 22, 63–67 (2004)
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Pal, M., Bandyopadhyay, S., Biswas, P. et al. Study of gain flatness for multi-channel amplification in single stage EDFA for WDM applications. Opt Quant Electron 39, 1231–1243 (2007). https://doi.org/10.1007/s11082-008-9193-x
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DOI: https://doi.org/10.1007/s11082-008-9193-x