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1. 发明授权

US06282341B1 Tunable, mechanically induced long-period fiber grating with enhanced polarizing characteristics 有权
标题翻译：可调谐，机械诱导具有增强的偏振特性的长周期光纤光栅
公开(公告)号：US06282341B1
公开(公告)日：2001-08-28
申请号：US09469744
申请日：1999-12-21
申请人： Michel J. F. Digonnet , Silviu Savin , Gordon S. Kino , H. John Shaw
发明人： Michel J. F. Digonnet , Silviu Savin , Gordon S. Kino , H. John Shaw
IPC分类号： G02B634
CPC分类号： G02B6/02071 , G02B6/02095 , G02B6/02109 , G02B6/022 , G02B6/274 , G02B6/2793 , H01S3/0675 , H01S2301/04
摘要： A new type of fiber filter is useable in optical communication systems. In particular, the fiber filter may be used to flatten the gain of erbium-doped fiber amplifiers (EDFAs). Such gain flattening is important for long-haul, dense (wavelength dependent multiplexed) WDM communication systems. The filter includes a periodic mechanical structure pressed against the side of a single-mode fiber to induce a wavelength-dependent loss in a signal propagating in the fiber core by coupling the signal to fiber cladding modes. The mechanical structure is a periodic comb of small ridges. Each ridge induces a local index change in the fiber via the photoelastic effect. For coupling to the right cladding modes, the period of the grating (and the comb) is in the range of few hundreds of microns. Thus, the grating is easy to fabricate with standard machining equipment.
摘要翻译：一种新型的光纤滤波器可用于光通信系统。特别地，光纤滤波器可用于平坦化掺铒光纤放大器（EDFA）的增益。这种增益平坦化对于长距离密集（波长相关多路复用）WDM通信系统是重要的。滤波器包括按照单模光纤侧面的周期性机械结构，以通过将信号耦合到光纤包层模式来引起在光纤芯中传播的信号中的波长相关损耗。机械结构是小脊的周期梳。每个脊通过光弹效应引起纤维中的局部折射率变化。为了耦合到正确的包层模式，光栅（和梳子）的周期在几百微米的范围内。因此，光栅易于用标准的加工设备制造。

2. 发明授权

US06356385B1 Inhomogeneous broadening to modify the gain of an optical amplifier 有权
标题翻译：不均匀的加宽以修改光放大器的增益
公开(公告)号：US06356385B1
公开(公告)日：2002-03-12
申请号：US09245554
申请日：1999-02-05
申请人： Michel J. F. Digonnet , Silviu Savin
发明人： Michel J. F. Digonnet , Silviu Savin
IPC分类号： H01S300
CPC分类号： H04B10/296 , H01S3/094042 , H01S3/1302 , H01S3/131 , H01S3/1608 , H01S3/1691 , H01S2301/04
摘要： An optical amplifier has a gain profile which is substantially flat and independent, over a wide range, of the pump power, power of the input signals, and the number of input signals. The amplifier utilizes an optical resonator having a gain medium whose gain broadening behaves inhomogeneously by pumping the gain medium at at least one wavelength in at least one absorption tail of the gain medium. The resonator is a ring resonator that preferably includes an erbium-doped fiber. Codopants may be added to the fiber to enhance the inhomogeneous broadening effect. A method of gain flattening introduces a pump signal into a gain medium. The pump signal has a wavelength in the tail of the absorption profile of the gain medium. A plurality of optical signals at different wavelengths are introduced into the gain medium. Stimulated emission within the gain medium clamps the gain of the gain medium.
摘要翻译：光放大器具有在泵浦功率，输入信号的功率和输入信号数量的大范围内基本平坦且独立的增益分布。放大器利用具有增益介质的光谐振器，其增益增宽通过在增益介质的至少一个吸收尾部中以至少一个波长泵浦增益介质而非均匀地表现。谐振器是优选包括铒掺杂光纤的环形谐振器。可以将纤维素添加到纤维中以增强不均匀的加宽效果。增益平坦化的方法将泵浦信号引入增益介质。泵浦信号在增益介质的吸收曲线的尾部具有波长。将不同波长的多个光信号引入到增益介质中。增益介质内的受激发射夹着增益介质的增益。

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