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    Article comprising a bragg reflective mach-zehnder filter of reduced coupler dependence
    2.
    发明公开
    Article comprising a bragg reflective mach-zehnder filter of reduced coupler dependence 审中-公开
    由马赫 - 曾德尔的对象与布拉格反射器具有减少的滤波器Kopplerabhängigkeit

    公开(公告)号：EP0909963A1

    公开(公告)日：1999-04-21

    申请号：EP98308092.0

    申请日：1998-10-05

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Henry, Charles Howard ,  Strasser, Thomas A. ,  Madsen, Christi Kay

    IPC: G02B6/122 ,  G02B6/293 ,  H04J14/02

    CPC classification number: G02B6/12007 ,  G02B2006/12159

    Abstract: A Bragg-reflective Mach-Zehnder filter consists of two planar optical waveguide segments (16,17) extending between 3 dB couplers (14,15). Each of the segments includes a refractive index Bragg grating, preferably a single grating (18) that extends across the two segments. In a conventional filter the straight-through (non-resonant) signal emerges at the port (21) opposite to the input port (19), so that it is a cross state of the filter. If the couplers (14,15) deviate from their nominal 50-50 coupling, there is a loss in the non-resonant signal which would significantly accumulate in a chain of such filters. According to the invention a phase difference of π radians between the two segments is introduced for transmitted signal, but not for reflective signals, for example by placing a phase shifter (31) in one segment downstream of the Bragg grating. The non-resonant signal now emerges at port 25, as a bar state of the filter, and the transmission is less sensitive to deviations of the couplers (14,15) from 50-50 coupling.

    Abstract translation: 的布拉格反射马赫 - 策德尔滤波器由两个平面光波导段（16,17）3分贝耦合器（14,15）之间延伸的。 每个节段包括一个折射率布拉格光栅，优选地单光栅（18）做跨两个区段延伸。 在传统的过滤器中的直通（非谐振）信号出现在端口（21）相反的输入端口（19），所以没有它是过滤器的一个交叉状态。 如果耦合器（14,15）与名义50-50耦合偏离，存在非共振信号，这将在搜索过滤器的环比大幅积累的损失。 。根据本发明所述两个部段之间PI弧度的相位差被引入反式mitted信号，但不用于反射信号，例如通过在布拉格光栅的下游的一个片段放置一个移相器（31）。 非共振信号现在在出现端口25，作为过滤器的直通状态，并且发送是从50-50耦合耦合器（14,15）的偏差较不敏感。

    Article comprising a cascaded raman fiber laser
    5.
    发明公开
    Article comprising a cascaded raman fiber laser 失效
    Kaskadenramanfaserlaser enthaltender Artikel

    公开(公告)号：EP0883221A1

    公开(公告)日：1998-12-09

    申请号：EP98304326.6

    申请日：1998-06-02

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Reed, William Alfred ,  Strasser, Thomas A. ,  Stentz, Andrew John

    IPC: H01S3/30

    CPC classification number: H01S3/302 ,  H01S3/0675

    Abstract: The conversion efficiency of a cascaded Raman laser (CRL 30) can be significantly improved if it comprises one or more of the below recited design features. The CRL comprises an intracavity section (21) between an input section (34) and an output section (35). The CRL is adapted for receiving pump radiation of wavelength λ p , and for emitting output radiation of wavelength λ n > λ p , and each of the input section and output section comprises fiber Bragg gratings of center wavelengths λ 1 , λ 2 .....λ n , where n ≥ 2 and λ 1 2 n . Among the efficiency-increasing features is ordering of the fiber Bragg gratings such that in the input section and the output section the gratings of center wavelengths λ 1 ....... λ n and λ 1 ...... λ n-1 , respectively, are disposed in sequence according to center wavelength, with center wavelengths increasing with increasing distance from the intracavity section. In a preferred embodiment the fiberBragg grating of center wavelength λ n of the output section is disposed between the intracavity section and the grating with center wavelength λ 1 . Other efficiency-increasing features are choice of the λ n grating in the output section such that it has a reflectivity in the range 10-25%, disposition of a grating of center wavelength λ p in the output section downstream of the λ n-1 grating, choice of at least some of the fiber Bragg gratings such that their reflectivity has full width at half maximum in the range 0.8-2.0 nm, selection of the fiber Bragg gratings such that the center wavelength spacing between successive gratings corresponds to a frequency shift in the range 11.7-14.9 THz, choice of a specified optical fiber refractive index profile, and use of an intracavity section of length in the range 300-1200 m.

    Abstract translation: 拉曼光纤激光器包括一段长度的光纤，其包括位于输入部分和输出部分之间的长度为L的腔内部分。 输入部分和输出部分各自包括具有中心波长λ1，λ2 ...λn的光纤布拉格光栅，其中n> = 2和λ1λ2 ...λn。 在输入部分，中心波长λ1，λ2 ...λn的光纤布拉格光栅根据中心波长依次定位。 中心波长随着距离腔内部分的距离增加而增加。 在输出部分，中心波长λ1，λ2 ...λn-1的光纤布拉格光栅根据中心波长依次定位。 中心波长随着距腔内部分的距离增加而增加。 在输出部分，中心波长λn的光纤布拉格光栅位于腔内部分和中心波长λn-1的光纤布拉格光栅之间。

    Mode coupling optical waveguide grating
    6.
    发明公开
    Mode coupling optical waveguide grating 失效
    模耦合光波导光栅

    公开(公告)号：EP0829740A3

    公开(公告)日：1998-04-22

    申请号：EP97306780.4

    申请日：1997-09-02

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Strasser, Thomas A.

    IPC: G02B6/16

    CPC classification number: G02B6/29317 ,  G02B6/02085 ,  G02B6/14 ,  G02B6/29332 ,  H01S3/06754 ,  H01S3/06758

    Abstract: Reflective mode coupling refractive index gratings are disclosed. The gratings can couple light of wavelength λ i in a fundamental spatial mode of the waveguide (e.g., LP 01 ) to a reflected higher order spatial mode (e.g., LP 11 ), substantially without reflection of any light of wavelength λ j ≠ λ i in a spectral range Δλ ≲ 0.01 λ i . The mode coupling gratings (MCGs) can find a variety of uses in optical waveguide systems. Exemplarily, an MCG can serve as a wavelength-dependent loss element with abrupt (e.g., ∼1 nm) spectral dependence. However, a chirped grating with or without strength modulation can yield an MCG having relatively wide spectral dependence, including variable loss over a relatively wide (e.g., ∼10 nm) spectral range. Both types of MCGs are advantageously used in, for instance, optical waveguide amplifiers.

    Abstract translation: 公开了反射模耦合折射率光栅。 光栅可以在波长（例如，LP01）的基本空间模式下将波长λi的光耦合到反射的高阶空间模式（例如，LP11），基本上不反射波长λj≠λi的任何光在光谱范围Δλ ≲0.01λi。 模式耦合光栅（MCG）可以在光波导系统中找到各种用途。 示例性地，MCG可以用作具有陡峭的（例如〜1nm）光谱依赖性的波长依赖性损耗元件。 然而，具有或不具有强度调制的啁啾光栅可以产生具有相对宽光谱依赖性的MCG，包括在相对宽（例如〜10nm）光谱范围内的可变损耗。 两种类型的MCG都有利地用于例如光波导放大器。

    Magnetically tunable optical fiber gratings
    8.
    发明授权
    Magnetically tunable optical fiber gratings 失效
    磁性可调谐光纤光栅

    公开(公告)号：EP0856752B1

    公开(公告)日：2001-05-09

    申请号：EP98300403.7

    申请日：1998-01-20

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Jin, Sungho ,  Strasser, Thomas A. ,  Lemaire, Paul Joseph

    IPC: G02B6/16 ,  G02F1/01

    CPC classification number: G02B6/2932 ,  G02B6/022 ,  G02B6/29322 ,  G02B6/29383 ,  G02F1/0131 ,  G02F1/0134 ,  G02F2201/307

    Abstract: In accordance with the invention, a tunable fiber grating comprises a fiber grating secured between a pair of magnets so that magnetic force (repulsive or attractive) applied to the magnets is transmitted to the grating. An electromagnet is disposed adjacent the magnets for applying the field to magnetize them. Control of the current applied to the electromagnet permits control of the force transmitted to the fiber grating and, thus, control of the grating strain, spacing and reflection frequency. In a preferred embodiment the electromagnet is actuated to produce magnetic pulses which control the remanent force between the two magnets, eliminating the need for continuous power. An add/drop multiplexer employing the tunable gratings is described.

    Method and apparatus for making continuous chirped fiber bragg gratings
    9.
    发明公开
    Method and apparatus for making continuous chirped fiber bragg gratings 失效
    用于制造光纤布喇格与连续调制的晶格常数光栅的方法和装置

    公开(公告)号：EP0840147A3

    公开(公告)日：1999-06-16

    申请号：EP97308602.8

    申请日：1997-10-28

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Kohnke, Glenn Eric ,  Strasser, Thomas A.

    IPC: G02B6/16

    CPC classification number: G02B6/02138 ,  G02B6/02085

    Abstract: In accordance with the invention, a continuous chirped fiber Bragg grating is made by fabricating a continuous chirped phase mask and using the mask to write a Bragg grating on a parallel fiber. The chirped phase mask is made by exposing a photoresist-coated mask substrate to two interfering beams: one a collimated beam and the other a beam reflected from a continuous curved mirror. After etching, the resulting phase mask can be used to write a chirped fiber grating having a continuously varying grating period without physical modification of the fiber. The resulting fiber grating has a widened bandwidth and uniform dispersive delay characteristics useful for dispersion compensation in critical telecommunications applications.

    Abstract translation: 连续相控啁啾相位掩模是通过形成具有涂覆有光致抗蚀剂（22）的平面表面上的UV透明材料并暴露抗蚀剂的光的通过直接准直光束的第一部分的干涉形成的图案（24）由 和准直光束（25），其由弯曲镜连续地（26）反射的第二部分全部。 抗蚀剂进行显影和基片进行蚀刻以产生相位掩模。

    Article comprising an optical waveguide tap
    10.
    发明公开
    Article comprising an optical waveguide tap 失效
    装置与光纤抽头

    公开(公告)号：EP0840150A3

    公开(公告)日：1999-06-02

    申请号：EP97308339.7

    申请日：1997-10-21

    Applicant: LUCENT TECHNOLOGIES INC.

    Inventor： Strasser, Thomas A. ,  Wagener, Jefferson Lynn

    IPC: G02B6/34

    CPC classification number: G02B6/29323 ,  G01J3/1895 ,  G02B6/02085 ,  G02B6/02138 ,  G02B6/29358 ,  G02B6/29359 ,  G02B6/34 ,  G02B6/4215 ,  G02B6/4274 ,  G02B6/4291

    Abstract: A dispersive optical wave guide tap comprises a blazed and chirped refractive index grating (14) in the core of the waveguide (12), coupling means (15) and utilization means (19). The grating is selected such that guided mode light of predetermined wavelength will, in the absence of the coupling means, be directed into one or more cladding modes of the waveguide. The presence of the coupling means in optical cooperation with the waveguide, changes the guiding conditions such that the cladding modes are substantially eliminated from a portion of the waveguide that includes the cladding, whereby the grating directs the guided mode light into one or more radiation modes. The blaze angle typically is ≤15°. The chirp serves to bring the radiation mode light substantially to a focus in at least one dimension, the focal point (or line) depending on the wavelength of the light. The utilization means exemplarily comprise an array of photodetectors, and the coupling means exemplarily comprise an appropriately shaped glass member and index matching means. Dispersive waveguide taps are advantageously used in WDM optical communication systems, e.g., to provide status information (e.g., channel wavelength, channel power, including presence or absence of a channel) to, e.g., a system maintenance unit. The status information facilitates maintenance of operating conditions by conventional feedback control.

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