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公开(公告)号：US5673280A
公开(公告)日：1997-09-30
申请号：US600354
申请日：1996-02-12
CPC分类号： H04B10/2916 , H01S3/302 , H01S2301/02 , H01S3/06787 , H01S3/094003 , Y10S372/703
摘要： A low noise optical fiber Raman amplifier (FRA) comprises an upstream and a downstream length of silica-based amplifier fiber, of combined length >200 m, typically >1 km, with an optical isolator disposed between the upstream and downstream lengths of amplifier fiber such that passage of backscattered signal radiation from the latter to the former is substantially blocked. In preferred embodiments counter-propagating pump radiation is coupled into the downstream length of amplifier fiber, and wavelength-selective means are provided for shunting the pump radiation around the optical isolator. The described FRA is advantageously incorporated into optical fiber communication systems. Exemplarily it can serve as power amplifier, as pre-amplifier, or as in-line amplifier. For instance, it can be used to replace conventional opto-electronic repeaters in existing 1.3 .mu.m fiber communication systems, or it can be used as power amplifier in a multi-subscriber optical fiber CATV system. In a still further exemplary embodiment, the FRA is used as a distributed pre-amplifier in a remotely pumped fiber communication system.
摘要翻译： 低噪声光纤拉曼放大器（FRA）包括上游和下游长度的二氧化硅基放大器光纤，其长度> 200m，通常> 1km，光隔离器设置在放大器光纤的上游和下游之间 使得后向散射信号辐射从后者到前者的通过基本上被阻挡。 在优选实施例中，反向传播的泵浦辐射被耦合到放大器光纤的下游长度中，并且提供波长选择装置用于在光隔离器周围分流泵浦辐射。 所描述的FRA有利地结合到光纤通信系统中。 例如，它可以作为功率放大器，作为前置放大器，或作为在线放大器。 例如，它可以用于替代现有的1.3μm光纤通信系统中的常规光电中继器，或者可以用作多用户光纤CATV系统中的功率放大器。 在又一示例性实施例中，FRA用作远程泵浦光纤通信系统中的分布式前置放大器。
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公开(公告)号：US5959750A
公开(公告)日：1999-09-28
申请号：US659607
申请日：1996-06-06
申请人： Lars Erik Eskildsen , Stephen Gregory Grubb , Per Bang Hansen , Andrew John Stentz , Kenneth Lee Walker
发明人： Lars Erik Eskildsen , Stephen Gregory Grubb , Per Bang Hansen , Andrew John Stentz , Kenneth Lee Walker
CPC分类号： H04B10/2916 , H01S3/06754 , H01S3/302 , H04J14/02 , H04J14/08
摘要： An upgrade method in which Raman amplification is added to an existing transmission system to provide an increase in power budget and permit a substantial increase in transmission capacity either by time division multiplexing (TDM), wavelength division multiplexing (WDM), or a combination thereof. The power budget improvement permits higher transmission capacity by increasing either a single channel data rate and/or the number of wavelength division multiplexed data channels that can be accommodated by existing fiber links.
摘要翻译： 一种升级方法，其中将拉曼放大添加到现有传输系统以提供功率预算的增加，并且通过时分复用（TDM），波分复用（WDM）或其组合来允许传输容量的显着增加。 功率预算改进通过增加单个信道数据速率和/或可由现有光纤链路容纳的波分复用数据信道的数量来允许更高的传输容量。
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公开(公告)号：US5933438A
公开(公告)日：1999-08-03
申请号：US910948
申请日：1997-08-08
CPC分类号： H01S3/0675 , H01S3/094003 , H01S3/09408 , H01S3/2383
摘要： An optical fiber amplifier is pumped by a pair of pump lasers which have at least partially overlapping resonators. In one embodiment, the fiber gain section of the amplifier is located external to the resonators. In another embodiment, the coupler, which couples the pump lasers to the gain section, is located at least partially within said resonators. In a preferred embodiment the resonators are provided with polarization selection properties, and the outputs of the pump lasers are coherent.
摘要翻译： 光纤放大器由一对具有至少部分重叠的谐振器的泵激光器泵浦。 在一个实施例中，放大器的光纤增益部分位于谐振器的外部。 在另一个实施例中，将泵浦激光器耦合到增益部分的耦合器至少部分地位于所述谐振器内。 在优选实施例中，谐振器具有偏振选择特性，并且泵浦激光器的输出是相干的。
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公开(公告)号：US5923684A
公开(公告)日：1999-07-13
申请号：US975899
申请日：1997-09-09
CPC分类号： H01S3/094003 , H01S3/0675 , H01S3/094011 , H01S3/094096
摘要： An optical fiber amplifier is pumped by a fiber pump laser which has a pair of separate active media within a common resonator. The fiber gain section of the amplifier is also located within the resonator.
摘要翻译： 光纤放大器由纤维泵浦激光器泵浦，光纤泵浦激光器在公共谐振器内具有一对单独的有源介质。 放大器的光纤增益部分也位于谐振器内。
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公开(公告)号：US5659644A
公开(公告)日：1997-08-19
申请号：US659853
申请日：1996-06-07
申请人： David John DiGiovanni , Stephen Gregory Grubb , Daryl Inniss , Ralph Stephen Jameson , Kenneth Lee Walker
发明人： David John DiGiovanni , Stephen Gregory Grubb , Daryl Inniss , Ralph Stephen Jameson , Kenneth Lee Walker
CPC分类号： G02B6/4215 , H01S3/094003 , G02B6/14 , G02B6/29356 , G02B6/2937 , G02B6/4207 , H01S3/0675 , H01S3/094069
摘要： In an optical fiber light source a section of multimode fiber is interposed between an energizing laser (e.g,, a diode laser) and a single mode fiber active medium. In a preferred embodiment the single mode fiber active medium is surrounded by a multimode cladding coupled to the multimode fiber. The source may serve as a pump laser for a fiber amplifier or as an amplified spontaneous emission source. Arrangements for coupling several energizing lasers to the active medium are also described.
摘要翻译： 在光纤光源中，将多模光纤的一部分介于激光激光器（例如，二极管激光器）和单模光纤活性介质之间。 在优选实施例中，单模光纤有源介质由耦合到多模光纤的多模包层围绕。 源可以用作光纤放大器的泵浦激光器或者作为放大的自发发射源。 还描述了将几个激励激光器耦合到活性介质的布置。
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公开(公告)号：US5805621A
公开(公告)日：1998-09-08
申请号：US747946
申请日：1996-11-12
申请人： Stephen Gregory Grubb , Clifford Headley , Martin Heinrich Muendel , Janet Renee Pedrazzani , Bennett H. Rockney , Thomas A. Strasser
发明人： Stephen Gregory Grubb , Clifford Headley , Martin Heinrich Muendel , Janet Renee Pedrazzani , Bennett H. Rockney , Thomas A. Strasser
CPC分类号： H01S3/0675 , H01S3/08022
摘要： Applicants have discovered that the intermodal beat noise of a fiber multimode laser can be substantially reduced by providing the fiber with an output coupler of broadened bandwidth. In a preferred embodiment, a reduced-noise, high power light source comprises a cladding pumped fiber laser having a chirped output grating. Experiments show that increasing the output bandwidth from 0.254 to 0.577 nm reduces the relative intensity-to-noise ratio 10 dB in a Nd-doped fiber laser. Increasing the bandwidth from 0.2 nm to 0.3 nm in a Yb-doped laser similarly reduces the noise by 12 dB.
摘要翻译： 申请人已经发现，通过为光纤提供带宽增加的输出耦合器，可以显着地减少光纤多模激光器的联运节拍噪声。 在优选实施例中，降噪噪声大功率光源包括具有啁啾输出光栅的包层泵浦光纤激光器。 实验表明，增加输出带宽从0.254到0.577纳米的Nd掺杂光纤激光器的相对强度 - 噪声比降低了10 dB。 在Yb掺杂激光器中将带宽从0.2 nm增加到0.3 nm同样可以将噪声降低12 dB。
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