发明名称 |
Optical transmission system equalizer. |
摘要 |
<p>Increasing the capacity of an existing lightwave transmission system can be accomplished by either increasing the bit rate or adding wavelength-multiplexed channels. Recent advances in erbium-doped fiber amplifier technology make the wavelength division multiplexed option particularly attractive. Unfortunately, because of nonuniform wavelength-dependent gain profile and saturation characteristic of erbium-doped fiber amplifiers, each channel of a wavelength-multiplexed system will experience a different optical gain which, in turn, can result in an excessive bit-error-rate performance in some channels. This invention is directed toward processing apparatus which selectively equalizes the optical gain or the optical signal-to-noise ratios of the channels of a wavelength-multiplexed optical transmission system. The output powers and the signal-to-noise ratios are selectively equalized by adjusting the optical input signal powers. With this invention, wavelength-multiplexed channels can be added to an existing optical fiber transmission system without requiring new optical components, upgrades or adjustments at intermediate amplifier sites. <IMAGE></p> |
申请公布号 |
EP0543570(A2) |
申请公布日期 |
1993.05.26 |
申请号 |
EP19920310342 |
申请日期 |
1992.11.12 |
申请人 |
AMERICAN TELEPHONE AND TELEGRAPH COMPANY |
发明人 |
CHRAPLYVY, ANDREW R.;NAGEL, JONATHAN A.;TKACH, ROBERT W. |
分类号 |
H01S3/10;H01S3/06;H01S3/067;H01S3/13;H04B10/08;H04B10/16;H04B10/17;H04B10/18;H04J14/00;H04J14/02 |
主分类号 |
H01S3/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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