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Rare-Earth-Doped Fibers for Telecommunications Applications

Published online by Cambridge University Press:  29 November 2013

M. Dejneka  and
B. Samson
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Primarily to meet the dramatic increase in Internet traffic, a substantial expansion in new fiber-optic networks has been seen in the last few years, increasing the total amount of transmission fiber deployed in the field. However, increased capacity has also been achieved by utilizing more of the available bandwidth present in the currently installed fiber. A key component in facilitating this increase in bandwidth is the erbium-doped fiber amplifier (EDFA), which provides efficient broad-band gain in the 1530–1560-nm telecommunications window. Erbium-doped glasses can be drawn into low-loss fiber, and the width of the gain band can be controlled with glass composition. With appropriate composition and design, EDFAs can simultaneously amplify 32 or more wavelengths, providing a 32-fold increase in data capacity over single-channel systems. These devices can boost signal strength by a factor of 1000, with high reliability and low noise at data rates exceeding 1 Tbit/s. In this article, we review some of the properties that are key to the success of EDFAs and discuss the potential for other rare-earth-doped glass-fiber combinations that may find possible applications in future telecommunications networks.

Fiber optics have revolutionized the telecommunications industry, providing more information capacity and greater distances between signal boosters than copper wire and coaxial cable. The attenuation in coaxial systems increases exponentially with signal frequency, making high-speed transmission over long distances impractical. The best copper systems have a bandwidth of about 10 Mbit/s and are limited to lengths of less than 200 m at high data rates. In contrast, the attenuation of SiO2 optical fibers is low and independent of signal frequency, thus optical fiber can easily support 100 Gbit/s (10,000 times the capacity of copper) over 80 km and is currently only limited by the speed of the transmission and receiving electronics, with capacities in excess of 50 Tbit/s theoretically possible.1 For links in excess of 80 km, signal amplification is necessary to prevent total loss of the signal. In the 1980s, amplification was done with electronic devices called repeaters that detected the light, converted it to an electronic signal, amplified, retimed, and then retransmitted it as an optical pulse.

The field of optical telecommunications has itself undergone a revolution. In the late 1980s, the invention of the all-optical amplifier allowed for simultaneous amplification of multiple channels in a single optical fiber each at a different wavelength or color of light. SiO2 fibers have a minimum in attenuation in the infrared (IR) portion of the optical spectrum near 1550 nm, as shown in Figure 1. The EDFA fortuitously provides high gain and low noise in the 1530-1560-nm spectral window. This technology now enables simultaneous amplification of 32 channels in a single fiber without the need for optical-to-electronic conversion. Thus single-fiber capacities of 320 Gbit/s are currently being deployed today. To perform this electronically, each channel would have to be separated (demultiplexed), amplified by its own costly repeater, and then recombined (multiplexed) in the fiber. Researchers are now perfecting 100-channel EDFAs in the lab.

Type
Photonic Applications of Rare-Earth-Doped Materials
Information
MRS Bulletin , Volume 24 , Issue 9 , September 1999 , pp. 39 - 45
Copyright
Copyright © Materials Research Society 1999

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References

1. A. Glass, Orton Memorial Lecture, presented at American Ceramic Society Meeting, Indianapolis, IN, April 26,1999.Google Scholar
2.Desurvire, E., Erbium-Doped Amplifiers, Principles and Applications, Chapter 4 (John Wiley & Sons, New York, 1994); Physics of Fiber Optics, Advances in Ceramics, vol. 2, edited by B. Bendow and S.S. Mitra (The American Ceramic Society, Columbus, OH, 1981); and in Optical Fiber Materials and Processing, edited by J.W. Fleming, G.H. Sigel Jr., S. Takahashi, and P.W. France (Mater. Res. Soc. Symp. Proc. 172, Pittsburgh, 1990).Google Scholar
3.Wu, F., Machewirth, D., Snitzer, E., and Sigel, G.H., J. Mater. Res. 9 (10) (1994) p. 2703; V. Matejec, I. Kasik, D. Berkova, M. Hayer, and J. Kanka, J. Sol-Gel Sci. Technol. 13 (1–3) (1998) p. 617.CrossRefGoogle Scholar
4.Fujiura, K., Nishida, Y., Sato, H., Sugawara, S., Kobayashi, K., Ternumuma, Y., and Takahashi, S., J. Non-Cryst. Solids 161 (1993) p. 14.CrossRefGoogle Scholar
5.Tran, D., Sigel, G., and Bendow, B., J. Lightwave Technol. 5 (1987) p. 1219.Google Scholar
6.Goldstein, E.L., Eskildsen, L., De Silva, V., Andrejo, M., and Silberg, Y., J. Lightwave Technol. 13 (1995) p. 782.CrossRefGoogle Scholar
7.Maurice, E., Monnom, G., Dussardier, B., and Ostowsky, D.B., J. Opt. Soc. Am. B 13 (1996) p. 693.CrossRefGoogle Scholar
8.Sun, Y., Sulhoff, J., Srivastava, A., Zyskink, J., Wolf, C., Strasser, T., Pedrazzani, J., Judkins, J., Espindola, R., and Zhou, J., “Ultra Wide Band Erbium-Doped Silica Fiber Amplifier with 80 nm of Bandwidth,” presented at Optical Amplifiers and Their Applications (Optical Society of America, Victoria, BC, Canada, July 1997) p. PD2–2.Google Scholar
9.Clesca, B., Bayart, D., and Beylat, J.L., Opt. Fiber Technol. 1 (1995) p. 135.CrossRefGoogle Scholar
10.Suzuki, K., Masuda, H., Kawai, S., Aida, K., and Nakagawa, K., “Bidirectional Ten-Channel 2.5 Gbit/s WDM Transmission over 250 km utilizing 76 nm Gain-Band Bidirectional Erbium-Doped Fiber Amplifiers,” presented at Optical Amplifiers and Their Applications (Optical Society of America, Victoria, BC, Canada, July 1997) p. PD12–1.Google Scholar
11.Yamada, M., Ono, H., Mori, A.,Kanamori, T., Sudo, S., and Ohishi, Y., “Ultra-Broad-Band and Gain-Flattened EDFAs for WDM Signals,” presented at Optical Amplifiers and Their Applications (Optical Society of America, Victoria, BC, Canada, July 1997) p. MB1–1.Google Scholar
12.Kohli, J., Minelly, J., Dickinson, J., and Goforth, D., New Class Forum in press.Google Scholar
13.Dejneka, M., MRS Bull. 23 (11) (1998) p. 57.CrossRefGoogle Scholar
14.Ellison, A.J. G., Dickinson, J.E., Goforth, D.E., Harris, D.L., Kohli, J.T., Minelly, J.D., Samson, B.N., Trentelman, J.K., and Yadlowsky, M.J., “Hybrid Erbium Silicate Conventional-Band Fiber Amplifier with Ultra-Low Gain Ripple,” presented at Optical Amplifiers and Their Applications (Optical Society of America, Nara, Japan, June 1999) p. PD–2.Google Scholar
15.Digonnet, M., ed., Rare Earth Doped Fiber Lasers and Amplifiers (Marcel Dekker, New York, 1993) p. 22.Google Scholar
16.Yamada, M.et al., in Proc. Conference on Lasers and Electro-Optics Pac Rim '97 (Chiba, Japan, 1997) p. 48.Google Scholar
17.Ohishi, Y., Kanamori, T., Kitagawa, T., and Takahashi, S., in Proc. OFC '91, (Optical Society of America, Washington, DC, 1991) p. 10.Google Scholar
18.Ohishi, Y., Kanamori, T., Kitagawa, T., Takahashi, S., Snitzer, E., and Sigel, G.H., Opt. Lett. 16 (22) (1991) p. 1747.CrossRefGoogle Scholar
19.Durteste, Y., Monerie, M., Allain, J.W., and Poignant, H., Electron. Lett. 27 (8) (1991) p. 626.CrossRefGoogle Scholar
20.Ohishi, Y. (private communication).Google Scholar
21.Tawarayama, H., Ishikawa, E., Itoh, K., Aoki, H., Yanagita, H., Okada, K., Yamanaka, K., Matsuoka, Y., and Toratani, H., “Efficient Amplification at 1.3 μm in a Pr3+ -Doped Ga-Na-S Fiber,” presented at Optical Amplifiers and Their Applications (Optical Society of America, Victoria, BC, Canada, July 1997) p. PD1–1.Google Scholar
22.Machewirth, D.P., Wei, K., Krasteva, V., Datta, R., Snitzer, E., and Sigel, G.H., J. Non-Cryst. Solids 213–214 (1997) p. 295.CrossRefGoogle Scholar
23.Snitzer, E., Phys. Rev. Lett. 7 (12) (1961) p. 444.CrossRefGoogle Scholar
24.Chen, C., Kim, I., Mizuhara, O., Nguyen, T., Ogawa, K., Tench, R., Tzeng, L., and Yeates, P., “1-Tb/s WDM transmission experiment over 342 km of TruWave fiber,” presented at Optical Fiber Communication Conference (IEEE Lasers and Electro-Optics Society and Optical Society of America, San Diego, CA, February 1999) p. PD7–1.Google Scholar
25.Laperle, P. and Chandonnet, A., Opt. Lett. 20 (24) (1995) p. 2484.CrossRefGoogle Scholar
26.Percival, R.M., Szebesta, D., and Davey, S.T., Electron. Lett. 28 (20) (1992) p. 1866.CrossRefGoogle Scholar
27.Komukai, T., Yamamoto, T., Sugawa, T., and Miyajima, Y., Electron. Lett. 28 (9) (1992) p. 830.CrossRefGoogle Scholar
28.Stolen, R.H. and Ippen, E.P., Appl. Phys. Lett. 22 (6) (1973) p. 276.CrossRefGoogle Scholar
29.van den Hoven, G., in Proc. European Conference on Optical Communication 98, (Convention of National Societies of Electrical Engineers of Europe, European Commission DG XIII, European Optical Society, IEEE Communications Society, IEEE Lasers and Electro-Optics Society, Optical Society of America, and Société Française d'Optique, Madrid, 1998).Google Scholar
30.van den Hoven, G.N. and Tiemeijer, L.F., “High Performance Semiconductor Optical Amplifiers,” presented at Optical Amplifiers and Their Applications (Optical Society of America, Victoria, BC, Canada, July 1997) p. 108.Google Scholar
31.DiGiovanni, D.J. and Muendel, M.H., Opt. Photon. News 10 (1) (1999) p. 27.CrossRefGoogle Scholar
32.Goldberg, L., Cole, B., and Snitzer, E., Electron. Lett. 33 (25) (1997) p. 2127.CrossRefGoogle Scholar
33.Townsend, J., Electron. Lett. 27 (21) (1991) p. 1958; J.D. Minelly, IEEE Photon. Technol. Lett. 5 (3) (1993) p. 301.CrossRefGoogle Scholar
34.Janos, M., Arkwright, J., and Brodzeli, Z., Electron. Lett. 33 (25) (1997) p. 2150.CrossRefGoogle Scholar
35.Williams, G., Tsai, T., Merzbacher, C., and Friebele, E., J. Lightwave Technol. 15 (8) (1997) p. 1357.CrossRefGoogle Scholar
36.Taunay, T., Bernage, P., Douay, M., Xie, W., Martinelli, G., and Niay, P., J. Opt. Soc. Am. B 14 (4) (1997) p. 912.CrossRefGoogle Scholar
37.Digonnet, M., Sadowski, R., Shaw, H., and Pantell, R., Opt. Fiber Technol. 3 (1) (1997) p. 44.CrossRefGoogle Scholar