发明名称 |
Nonlinear fiber amplifiers used for a 1430-1530 nm low-loss window in optical fibers |
摘要 |
An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths lambdr should lie in close proximity to the zero-dispersion wavelength lambd0 of the amplifying fiber. For this intermediate Raman order, spectral broadening will occur due to phase-match with four-wave mixing (if lambdr<lambd0) or phase-matched parametric amplification (if alphar>lambd0). In further cascaded Raman orders, the gain spectrum will continue to broaden due to the convolution of the gain spectrum with the spectrum from the previous Raman order.
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申请公布号 |
US6606187(B1) |
申请公布日期 |
2003.08.12 |
申请号 |
US20000694858 |
申请日期 |
2000.10.23 |
申请人 |
THE REGENTS OF THE UNIVERSITY OF MICHIGAN;XTERA COMMUNICATIONS, INC. |
发明人 |
ISLAM MOHAMMED NAZRUL;HARRIS HAYDEN HENRY |
分类号 |
H01S3/06;H01S3/067;H01S3/10;H01S3/108;H01S3/30;H04B10/17;(IPC1-7):H01S3/30;H04B10/18;G02B6/26 |
主分类号 |
H01S3/06 |
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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