-
公开(公告)号：US5059230A
公开(公告)日：1991-10-22
申请号：US468433
申请日：1990-01-22
IPC分类号： C03B37/012 , C03B37/018 , C03C13/04 , G02B6/00
CPC分类号： C03C13/045 , C03B37/01211 , C03B2201/04 , C03B2201/34 , C03B2201/36 , C03B2203/22 , Y10S65/90
摘要： Reproducible doped optical fiber preforms having a predetermined dopant concentration level are fabricated by inserting a doped filament into a completed preform prior to consolidation and final collapse so that the filament and dopant materials are centrally located in the core region upon formation of the preform. Doped fiber is drawn from the doped preform using standard fiber drawing techniques.
-
2.发明授权Lightwave transmission system having remotely pumped quasi-distributed amplifying fibers 失效具有远程泵浦准分布放大光纤的光波传输系统
公开(公告)号：US5039199A
公开(公告)日：1991-08-13
申请号：US458928
申请日：1989-12-29
IPC分类号： G02B6/02 , G02F1/00 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/0915 , H01S3/30 , H04B10/00 , H04B10/17
CPC分类号： H04B10/2912 , H01S3/06754 , H04B10/291 , H04B10/2916 , H04B10/2935 , H01S3/302
摘要： Near uniform optical amplification is achieved in a lightwave transmission system in which a plurality of short lengths of rare earth doped silica-based fibers and a corresponding plurality of long lengths of substantially undoped silica-based fibers are interleaved to form a fiber span having alternating sections of compensated (moderate gain) and uncompensated lightwave transmission media. Pumping of the amplifying fiber sections is performed remotely from either end of the fiber span. Bidirectional pumping, that is, pumping from each end of the fiber span, enhances the uniformity of the optical amplification for signals over the entire span. Amplifying fiber section lengths are variable in substantially inverse proportion to dopant concentration within the particular section.
摘要翻译： 在光波传输系统中实现近均匀光放大，其中多个短长度的稀土掺杂的二氧化硅基纤维和相应的多个长长度的基本上未掺杂的二氧化硅基纤维交织以形成具有交替部分的纤维跨距 的补偿（中等增益）和无补偿的光波传输介质。 从纤维跨度的任一端远程执行放大纤维部分的泵送。 双向泵浦，即从纤维跨度的每端泵浦，增强了整个跨度信号的光放大的均匀性。 放大纤维段长度可以与特定区段内的掺杂剂浓度基本成反比。
-
公开(公告)号：US5274659A
公开(公告)日：1993-12-28
申请号：US860526
申请日：1992-03-30
CPC分类号： H01S3/06791 , H01S3/082 , H01S3/1396 , H01S3/1062 , H01S3/1109 , H01S3/1121 , H01S3/1305
摘要： In a harmonically mode-locked laser, first (33) and second (34) optical beams are derived from the laser optical path which are directed, respectively, through first and second optical filters (37) having optical pass-bands (40, 41) that are displaced in frequency but which intersect at approximately the center frequency (f.sub.c) of operation of the laser. The free spectral range of a Fabry-Perot optical resonator (24) in the laser ring is deviated from a frequency exactly equal to the pulse repetition rate of the laser by a frequency (df) sufficient to permit changes in the length of the optical path to be manifested as changes in the wavelength of light transmitted along the optical path. Apparatus (39, 40, 42) for detecting the difference of intensity of light passing through the first and second filters can then be used to generate a signal proportional to the difference of intensity of such light for the purpose of adjusting, by length adjusting apparatus (43), the length of the optical path to compensate for spurious temperature-induced length variations.
摘要翻译： 在谐振锁模激光器中，第一（33）和第二（34）光束从激光光路导出，分别通过具有光通带（40,41）的第一和第二滤光器（37） ），其在频率上移位，但是在激光器的操作的近似中心频率（fc）处相交。 激光环中的法布里 - 珀罗光学谐振器（24）的自由光谱范围偏离与激光器的脉冲重复频率完全相同的频率，频率（df）足以允许光路长度的变化 被表现为沿着光路传输的光的波长的变化。 用于检测通过第一和第二滤波器的光的强度差的装置（39,40,42）可用于产生与这种光的强度差成比例的信号，以便通过长度调节装置 （43），光路的长度以补偿杂散温度引起的长度变化。
-
公开(公告)号：US4635263A
公开(公告)日：1987-01-06
申请号：US851274
申请日：1986-04-10
申请人： Linn F. Mollenauer
发明人： Linn F. Mollenauer
CPC分类号： H01S3/1112 , H01S2301/085 , H01S3/08013 , H01S3/083 , H01S3/105 , H01S3/106 , H01S3/1068 , H01S3/1086 , H01S3/1109 , H01S3/1681 , H01S3/302
摘要： A portion of the pulsed output of a 3-mirror, folded, astigmatically compensated cavity of a c.w., mode-locked, color center laser is coupled into a single-mode, polarization-preserving optical fiber. Following compression of the pulses by their propagation through the fiber, the shortened pulses, which take the form of essentially solitons, are fed back into the laser cavity so as to coincide and be in phase with the pulses in the laser cavity. Through the process of stimulated emission in the color center crystal, the injected pulses force the laser itself to produce shorter pulses of essentially the same shape as the solitons. Also described are embodiments employing a mode-locked semiconductor, fiber-Raman laser, and unidirectional pulse propagation in the fiber. Two of the fiber-Raman laser embodiments have separate gain and pulse shaping sections of optical fiber joined by an optical fiber directional coupler.
摘要翻译： c.w.模式锁定彩色中心激光器的3镜，折叠，散光补偿腔的一部分脉冲输出耦合到单模，偏振保留光纤中。 在通过它们通过光纤的传播来压缩脉冲之后，采取基本孤子形式的缩短的脉冲被反馈到激光腔中，以便与激光腔中的脉冲重合并与其相位。 通过彩色中心晶体中受激发射的过程，注入的脉冲迫使激光器本身产生与孤子基本相同形状的较短脉冲。 还描述了在光纤中采用锁模半导体，光纤拉曼激光器和单向脉冲传播的实施例。 两个光纤拉曼激光器实施例具有通过光纤定向耦合器连接的光纤的单独的增益和脉冲整形部分。
-
5.发明授权Soliton transmission system having sliding-frequency guiding filters with particular filter strengths and sliding rates 失效Soliton传输系统具有特定滤波器强度和滑动速率的滑动频率导引滤波器
公开(公告)号：US5463489A
公开(公告)日：1995-10-31
申请号：US297336
申请日：1994-08-29
CPC分类号： H04B10/25077
摘要： A soliton transmission system comprising optical filters whose center frequency intentionally differs from the center frequency of adjacent optical filters is disclosed, wherein the filter strength .eta. of the filters is between about 0.3-0.5, and preferably is 0.4. The center frequency of the series of optical filters is translated along the desired length of the system in a predetermined manner at a rate of less than or equal to (2/27).sup.1/2 .eta. and greater than or equal to 0.034.eta.+0.047.eta..sup.2. The center frequencies of the optical filters preferably increase in the direction of propagation.
摘要翻译： 公开了一种包括其中心频率与相邻滤光器的中心频率有意地不同的滤光器的孤子传输系统，其中滤光器的滤光强度等于或大于0.3-0.5，优选为0.4。 一系列滤光器的中心频率以小于或等于（2/27）1/2等于或大于或等于0.034等于+0.047的速率以预定方式沿着系统的期望长度平移 光学滤波器的中心频率优选地在传播方向上增加。
-
6.发明授权Method for forming spatially-varying distributed Bragg reflectors in optical media 失效在光学介质中形成空间变化的分布式布拉格反射器的方法
公开(公告)号：US5363239A
公开(公告)日：1994-11-08
申请号：US995492
申请日：1992-12-23
申请人： Victor Mizrahi , Linn F. Mollenauer
发明人： Victor Mizrahi , Linn F. Mollenauer
CPC分类号： G02B6/02138 , C03C13/045 , C03C25/6226 , C03C25/6233 , G02B6/02133 , G02B6/124 , H01S3/094003 , C03B2201/34 , C03B2203/18 , G02B6/0208 , G02B6/02085 , G02B6/02152 , H01S3/0675 , H01S3/094015
摘要： A method for forming a grating in a photosensitive medium such as a photosensitive optical fiber. The method comprises impinging a pair of interfering, actinic beams onto the medium, and during the impinging step, advancing the illuminated portion of the interference pattern relative to the medium. The advancement is carded out without changing the phase, or registration, of the interference pattern. According to one embodiment of the invention, a grating having a spatially dependent period is produced by varying the wavelength or the intersection angle of the actinic beams during the advancement. According to a second embodiment of the invention, a grating having a spatially dependent refractive index perturbation is produced by varying the dose of actinic radiation received by the medium during the advancement.
摘要翻译： 一种在诸如光敏光纤的感光介质中形成光栅的方法。 该方法包括将一对干涉光束束照射到介质上，并且在入射步骤期间相对于介质推进干涉图案的照射部分。 在不改变干扰模式的相位或注册的情况下，进行梳理。 根据本发明的一个实施例，具有空间依赖周期的光栅通过在提前期间改变光化光束的波长或相交角来产生。 根据本发明的第二实施例，通过改变介质在进给期间接收的光化辐射的剂量来产生具有空间上依赖的折射率扰动的光栅。
-
公开(公告)号：US5111322A
公开(公告)日：1992-05-05
申请号：US680456
申请日：1991-04-04
CPC分类号： G02B6/272 , G02B6/2773 , H04B10/25077 , H04J14/06 , H04J14/08
摘要： The single-wavelength bit-rate capacity of an ultra long distance soliton transmission system is increased by using a combination of polarization and time-division multiplexing. More specifically, two streams of differently (preferably orthogonally) polarized solitons are interleaved (time division multiplexed) at a transmitter, and later separated at the receiver to recover both data streams. The system operates at speeds of up to 7.5 GHZ and provides very thorough separation of channels required for 10.sup.-12 error rates at distances of 9000 km.
-
公开(公告)号：US5058974A
公开(公告)日：1991-10-22
申请号：US418000
申请日：1989-10-06
申请人： Linn F. Mollenauer
发明人： Linn F. Mollenauer
CPC分类号： H04B10/2912 , H04B10/291 , H04B10/2916 , H04B10/2935 , H01S3/06745 , H01S3/302
摘要： Bidirectional lightwave transmission is restored and uniform amplification of lightwave signals over long spans of optical fiber is achieved by employing distributed amplification over the spans. Distributed amplification is achieved with an amplifying optical fiber which includes a long length of optical fiber having a dilute rare-earth dopant concentration substantially in the fiber core region, and a corresponding pump signal generator at at least one end of the doped fiber having the appropriate wavelength and power to cause amplification of optical signals by both Raman effects and stimulated emission from the rare-earth dopants. Dilute concentrations are understood as the range of concentrations substantially satisfying the condition that the gain from the rare-earth dopant, when near saturation, is substantially equal to the fiber loss.
-
公开(公告)号：US5035481A
公开(公告)日：1991-07-30
申请号：US571963
申请日：1990-08-23
申请人： Linn F. Mollenauer
发明人： Linn F. Mollenauer
CPC分类号： H04B10/25077
摘要： Long distance soliton lightwave communications systems are considered for next generation application in terrestrial and transoceanic environments. These systems employ a chain of lumped fiber amplifiers interconnected by long spans of dispersion shifted optical fiber. In such systems, resultant pulse distortion and dispersive wave radiation are minimized when the soliton period is long relative to the perturbation length which is the longer of either the amplification period defined in terms of the length of the optical fiber span between consecutive amplifiers or the dispersion period defined in terms of the length over which the dispersion exhibits a periodic characteristic. Additional system parameters for optimized soliton transmission include the relationships of both the path-average soliton power to the normal soliton power and the path-average dispersion from one optical fiber span to the next. Single channel and wavelength division multiplexed systems are disclosed.
-
公开(公告)号：US4881790A
公开(公告)日：1989-11-21
申请号：US185573
申请日：1988-04-25
申请人： Linn F. Mollenauer
发明人： Linn F. Mollenauer
CPC分类号： H04B10/2916
摘要： An optical fiber communications system with Raman amplification of the signal radiation comprises a broadband pump radiation source, or, preferably, a multiplicity of pump radiation sources and polarization maintaining optical fiber as the transmission medium. The sources are selected to result in a pump radiation spectrum having individual spectral components such that pump radiation intensity for each spectral component in the desired polarization in the fiber core is less than a critical intensity I.sub.c. In particular, the average intensity of pump radiation in a first spectral interval, centered on any wavelength .lambda..sub.p in the pump radiation spectrum and of width equal to the Brillouin line width of the fiber at .lambda..sub.p, is to be less than that average intensity in the first spectral interval that results in conversion of 10% of the radiation in the first spectral interval to stimulated Brillouin radiation. Use of a multiplicity of pump sources not only can reduce pump noise and pump depletion due to stimulated Brillouin scattering, but typically also can result in enhanced system reliability and lower cost. In a preferred embodiment, the invention in a soliton fiber communications system, with pump radiation injected at one or more intermediate fiber locations.
-
-
-
-
-
-
-
-
-
搜索结果
24 条记录 (耗时 0.016 秒)
