Abstract

We have investigated gain flattening of EDFA systems with or without a gain equalizer for WDM long-haul transmission using a re-circulating EDFA loop. Without a gain equalizer, gain variation as small as 2.9 dB was achieved over the 10-nm band of a 100 cascaded EDFA system by the inversion principle. With a gain equalizer based on all-fiber acousto-optic tunable filters, two different config-urations of EDFAs were tested. For a single-stage EDFA scheme, the 21-nm band has shown 3.8 dB of gain variation at 17.4 ∼ 20.3 dB of OSNRs after the 100the stage of EDFAs. For a dual-stage EDFA scheme, a wider bandwidth of 34 nm has shown 3.6-dB variation after 40 cascaded EDFAs.

© 2000 Optical Society of Korea

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1999 (2)

K. Imai, T. Tsuritani, N. Takeda, K. Tanaka, N. Edagawa, and M. Suzuki, in Optical Fiber Communication Conference "99, (Optical Society of America, San Diego, USA, 1999), PD5

S. H. Yun, B. W. Lee, H. K. Kim, and B. Y. Kim, in Optical Fiber Communication Conference "99, (Optical Society of America, San Diego, USA, 1999), PD28

1998 (5)

H. S. Chung, D. Lee, Y. C. Chung, S. J. Ahn, and H. K. Cho, Electron. Lett. 34, 2045 (1998)
[CrossRef]

S. Aisawa, T. Sakamoto, M. Fukui, J. Kank, M. Jinno, and K. Oguchi, in Optical Fiber Communication Conference "98, (Optical Society of America, San Jose, USA, 1998), PDl1

A. K. Srivastava, Y. Sun, J. W. Sulhoff, C. Wolf, et al., in Optical Fiber Communication Conference "98, (Optical Society of America, San Jose, USA, 1998), PD10

N. Takeda, H. Taga, K. Imai, Y. Horiuchi, N. Edagawa, M. Suzuki, and S. Yamamoto, Electron. Lett. 34, 381 (1998)
[CrossRef]

H. S. Kim, S. H. Yun, H. K. Kim, N. Park, and B. Y. Kim, IEEE Photon. Technol. Lett. 10, 790 (1998)
[CrossRef]

1997 (2)

S. H. Huang, X. Y. Zou, A. E. Willner, Z. Bao, and D. A. Smith, IEEE Photon. Technol. Lett. 9, 389 (1997)
[CrossRef]

N. S. Bergano, C. R. Davidson, M. A. Mills, P. C. Corbett, S. G. Evangelides, B. Pedersen, R. Menges, J. L. Zyskind, J. W. Sulhoff, A. K. Srivastava, C. Wolf, and J. Judkins, in Optical Fiber Communication Conference "97, (Optical Society of America, Dallas, USA, 1997), PDl6

1994 (1)

D. Lee, P. F. Wysocki, J. R. Simpson, D. J. DiGiovanni, K. L. Walker, and D. Gasper, IEEE Photon. Technol. Lett. 6, 1094 (1994)
[CrossRef]

Electron. Lett. (2)

N. Takeda, H. Taga, K. Imai, Y. Horiuchi, N. Edagawa, M. Suzuki, and S. Yamamoto, Electron. Lett. 34, 381 (1998)
[CrossRef]

H. S. Chung, D. Lee, Y. C. Chung, S. J. Ahn, and H. K. Cho, Electron. Lett. 34, 2045 (1998)
[CrossRef]

IEEE Photon. Technol. Lett. (3)

S. H. Huang, X. Y. Zou, A. E. Willner, Z. Bao, and D. A. Smith, IEEE Photon. Technol. Lett. 9, 389 (1997)
[CrossRef]

H. S. Kim, S. H. Yun, H. K. Kim, N. Park, and B. Y. Kim, IEEE Photon. Technol. Lett. 10, 790 (1998)
[CrossRef]

D. Lee, P. F. Wysocki, J. R. Simpson, D. J. DiGiovanni, K. L. Walker, and D. Gasper, IEEE Photon. Technol. Lett. 6, 1094 (1994)
[CrossRef]

Optical Fiber Communication Conference '97 (1)

N. S. Bergano, C. R. Davidson, M. A. Mills, P. C. Corbett, S. G. Evangelides, B. Pedersen, R. Menges, J. L. Zyskind, J. W. Sulhoff, A. K. Srivastava, C. Wolf, and J. Judkins, in Optical Fiber Communication Conference "97, (Optical Society of America, Dallas, USA, 1997), PDl6

Optical Fiber Communication Conference '98 (2)

S. Aisawa, T. Sakamoto, M. Fukui, J. Kank, M. Jinno, and K. Oguchi, in Optical Fiber Communication Conference "98, (Optical Society of America, San Jose, USA, 1998), PDl1

A. K. Srivastava, Y. Sun, J. W. Sulhoff, C. Wolf, et al., in Optical Fiber Communication Conference "98, (Optical Society of America, San Jose, USA, 1998), PD10

Optical Fiber Communication Conference '99 (2)

K. Imai, T. Tsuritani, N. Takeda, K. Tanaka, N. Edagawa, and M. Suzuki, in Optical Fiber Communication Conference "99, (Optical Society of America, San Diego, USA, 1999), PD5

S. H. Yun, B. W. Lee, H. K. Kim, and B. Y. Kim, in Optical Fiber Communication Conference "99, (Optical Society of America, San Diego, USA, 1999), PD28

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