Abstract

We report the results of experimental and theoretical investigations of the transmission and coupling characteristics of an in-line multimode Cr-doped fiber (MMCDF) in a single mode fiber (SMF) optical link. This is the situation involved in the employment of a broadband MMCDF optical amplifier in an optical network. The excitation of several modes in the MMCDF can lead to a severe insertion loss. By selecting a proper core diameter of the MMCDF, it is possible to achieve mode-matching at the junctions between the SMF and the MMCDF. This leads to the excitation of predominantly the fundamental ${\rm LP}_{01}$ mode in a step-index MMCDF, result in a minimization of the insertion loss at both ends of the MMCDF. Using an MMCDF with a length of 12.5 cm and an average core diameter of 13.5 $\mu\hbox{m}$, we obtained a coupling efficiency of 64.6%$\,\sim \,$74.1% in the spectral region from 1300 to 1600 nm. The measured coupling efficiencies are in good agreement with our theoretical modeling. The result indicates that the low insertion loss of MMCDF may be used as an inline ultra-broadband optical amplifier in an optical link for the entire 1300 to 1600 nm spectral range of low-loss windows of silica fibers. Our results are presented and discussed.

© 2009 IEEE

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2008 (1)

K. Y. Huang, K. Y. Hsu, D. Y. Jheng, W. J. Zhuo, P. Y. Chen, P. S. Yeh, S. L. Huang, "Adiabatic wave propagation in ${\hbox{Cr}}^{4+}$:YAG double-clad crystal fiber fabricated by sapphire tube assisted CDLHPG technique," Opt. Expr. 16, 12264-12271 (2008).

2006 (1)

Y. C. Huang, Y. K. Lu, J. C. Chen, Y. C. Hsu, Y. M. Huang, S. L. Huang, W. H. Cheng, "Broadband emission from Cr-doped fibers fabricated by drawing tower," Opt. Exp. 14, 8492-8497 (2006).

2005 (2)

J. C. Chen, C. Y. Lo, K. Y. Huang, F. J. Kao, S. Y. Tu, S. L. Hunag, "Fluorescence mapping of oxidation states of Cr ions in YAG crystal fibers," J. Cryst. Growth 274, 522-529 (2005).

C. Y. Lo, K. Y. Huang, J. C. Chen, C. Y. Chuang, C. C. Lai, S. L. Huang, Y. S. Lin, P. S. Yeh, "Double-clad ${\hbox{Cr}}^{4+}$:YAG crystal fiber amplifier," Opt. Lett. 30, 129-131 (2005).

2004 (2)

2003 (1)

C. Batchelor, W. J. Chung, S. Shen, A. Jha, "Enhanced room-temperature emission in ${\hbox{Cr}}^{4+}$ ions containing alumino-silicate glasses," Appl. Phys. Lett. 82, 4035-4037 (2003).

2000 (1)

S. Tanabe, X. Feng, "Temperature variation of near-infrared emission from ${\hbox{Cr}}^{4+}$ in aluminate glass for broadband telecommunication," Appl. Phys. Lett. 77, 818-820 (2000).

Appl. Phys. Lett. (2)

S. Tanabe, X. Feng, "Temperature variation of near-infrared emission from ${\hbox{Cr}}^{4+}$ in aluminate glass for broadband telecommunication," Appl. Phys. Lett. 77, 818-820 (2000).

C. Batchelor, W. J. Chung, S. Shen, A. Jha, "Enhanced room-temperature emission in ${\hbox{Cr}}^{4+}$ ions containing alumino-silicate glasses," Appl. Phys. Lett. 82, 4035-4037 (2003).

J. Cryst. Growth (1)

J. C. Chen, C. Y. Lo, K. Y. Huang, F. J. Kao, S. Y. Tu, S. L. Hunag, "Fluorescence mapping of oxidation states of Cr ions in YAG crystal fibers," J. Cryst. Growth 274, 522-529 (2005).

J. Lightwave Technol. (1)

Opt. Exp. (1)

Y. C. Huang, Y. K. Lu, J. C. Chen, Y. C. Hsu, Y. M. Huang, S. L. Huang, W. H. Cheng, "Broadband emission from Cr-doped fibers fabricated by drawing tower," Opt. Exp. 14, 8492-8497 (2006).

Opt. Expr. (1)

K. Y. Huang, K. Y. Hsu, D. Y. Jheng, W. J. Zhuo, P. Y. Chen, P. S. Yeh, S. L. Huang, "Adiabatic wave propagation in ${\hbox{Cr}}^{4+}$:YAG double-clad crystal fiber fabricated by sapphire tube assisted CDLHPG technique," Opt. Expr. 16, 12264-12271 (2008).

Opt. Lett. (3)

Other (6)

Y. C. Huang, Y. K. Lu, J. C. Chen, Y. C. Hsu, Y. M. Huang, H. M. Yang, M. T. Sheen, S. L. Huang, T. Y. Chang, W. H. Cheng, "Fabrication of Cr-doped fibers by drawing tower," Optical Fiber Communication Conf. (OFC) AnaheimCA (2006) OWI21.

G. P. Agrawal, Fiber-Optic Communication Systems (Wiley, 2002).

G. Keiser, Optical Fiber Communications (Tata McGraw-Hill, 2008).

D. H. Sim, Y. Takushima, Y. C. Chung, "Transmission of 10-Gb/s and 40-Gb/s signals over 3.7 km of multimode fiber using mode-field matched center launching technique," Optical Fiber Communication Conf. (OFC) AnaheimCA (2007) OTuL3.

A. Yariv, P. Yeh, Photonics (Oxford Univ. Press, 2006).

Photon Design, 4.3 ed., FimmPropOxfordU.K. (2004).

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