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52.发明公开Waveguides for use in acousto-optical mode converters and method for making the same 审中-公开Wellenleiter zur Verwendung in akustooptischen Modenumwandlern und Herstellungsmethodedafür
公开(公告)号：EP0969310A1
公开(公告)日：2000-01-05
申请号：EP99110918.2
申请日：1999-06-04
CPC分类号： G02F1/335 , G02B6/1342 , G02B2006/12116 , G02F1/125
摘要： The invention relates to optical birefringent waveguides, acousto-optical devices using such optical waveguides and an acoustic waveguide formed in a substrate as well as a manufacturing method therefore. The optical waveguides of the invention exhibit a small birefringent variation with respect to a change of waveguide parameters, if the fundamental mode propagating in the optical waveguide has a propagation constant near to the cut-off condition. The optical waveguide dimensions are typically chosen such that the cut-off wavelength of the waveguide is below 1650 nm for an operating wavelength in the window between 1530 nm and 1565 nm. The acousto-optic mode converter using such optical waveguides have a superior conversion characteristic over the conversion frequency with reduced side lobes. Therefore, using the thin and narrow optical waveguides of the invention, a superior performance of the acousto-optical devices using such an optical waveguide can be obtained.
摘要翻译： 本发明涉及光学双折射波导，使用这种光波导的声光器件和形成在衬底中的声波导以及其制造方法。 如果在光波导中传播的基模具有接近截止条件的传播常数，则本发明的光波导相对于波导参数的变化表现出小的双折射变化。 通常选择光波导尺寸，使得对于1530nm和1565nm之间的窗口中的工作波长，波导的截止波长低于1650nm。 使用这种光波导的声光模式转换器在转换频率上具有优异的转换特性，并且旁瓣减少。 因此，使用本发明的薄而窄的光波导，可以获得使用这种光波导的声光装置的优异性能。
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公开(公告)号：EP0749591B1
公开(公告)日：1999-09-15
申请号：EP95908349.4
申请日：1995-02-17
CPC分类号： G02F1/335 , G02F1/0134 , G02F1/125 , G02F1/3131 , G02F2201/124
摘要： An optical device comprises an optical fibre directional coupler having at least a first optical fibre (10) optionally coupled at a coupling region (30) to a second optical fibre (20) such that light can propagate in the coupling region in at least two possible electromagnetic transmission modes; and means (40, 50, 60) for transferring energy between the modes by a spatially periodic perturbation (e.g. a flexural acoustic vibration or an electric field generated by a pair of interdigital electrodes) of at least a part of the coupling region.
摘要翻译： 一种光学装置包括光纤定向耦合器，所述光纤定向耦合器具有至少第一光纤（10），其可选地在耦合区域（30）处耦合到第二光纤（20），使得光可以在至少两种可能的方式中在耦合区域中传播 电磁传输模式; 和用于通过耦合区的至少一部分的空间周期性扰动（例如弯曲声波振动或由一对叉指电极产生的电场）在模式之间传递能量的装置（40,50,60）。
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54.发明公开Acousto-optical tunable filters cascaded together 有权Optische Filterungsvorrichtung beruhend auf hintereinander angeordneten akustooptisch abstimmbaren Filtern
公开(公告)号：EP0938017A1
公开(公告)日：1999-08-25
申请号：EP99102744.2
申请日：1999-02-19
申请人： FUJITSU LIMITED
发明人： Nakazawa, Tadao , Onaka, Hiroshi , Seino, Minoru
IPC分类号： G02F1/125
CPC分类号： G02F1/113 , G02F1/116 , G02F1/125 , G02F2201/16 , G02F2202/20
摘要： A configuration of acousto-optical tunable filters (AOTF) having stable output characteristics so that the output does not significantly vary with time. The configuration includes a plurality of AOTFs cascaded together. Each AOTF generates a surface acoustic wave in an optical waveguide in accordance with RF signals applied to the AOTF. A phase of a beat generated by the RF signals applied to one of the plurality of AOTFs is different from a phase of a beat generated by the RF signals applied to a different AOTF of the plurality of AOTFs.
摘要翻译： 具有稳定输出特性的声光可调谐滤波器（AOTF）的配置，使得输出不随时间显着变化。 该配置包括多个级联在一起的AOTF。 每个AOTF根据施加到AOTF的RF信号在光波导中产生声表面波。 由施加到多个AOTF中的一个的RF信号产生的拍子的相位与由施加到多个AOTF的不同AOTF的RF信号产生的拍子的相位不同。
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55.发明公开
公开(公告)号：EP0882251A1
公开(公告)日：1998-12-09
申请号：EP97931873.0
申请日：1997-07-04
申请人： THOMSON CSF
CPC分类号： H01S3/0057 , G02F1/11 , G02F1/113 , G02F1/116 , G02F1/125 , G02F2203/26
摘要： This acousto-optic device comprises an elasto-optic medium (1) with an acoustic transducer (2) capable of generating in the elasto-optic medium an acoustic wave modulated along a predetermined direction, and means for coupling in the elasto-optic medium a polarised incident optical wave (Si). The device has a programming circuit (6) for modulating the acoustic wave. This device can be inserted in a laser system. It then receives a polarised extended optical impulse to be amplified and supplies an extended optical impulse. An optical amplifier amplifies the extended optical impulse and an optical compressing device compresses the amplified extended optical impulse. The effects of the chain dispersal can be compensated by programming the acousto-optic device.
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公开(公告)号：EP0843392A2
公开(公告)日：1998-05-20
申请号：EP97116907.3
申请日：1997-09-29
发明人： Chang, Kok-Wai
IPC分类号： H01S3/106
CPC分类号： G02F1/125 , H01S3/1068
摘要： A tunable laser [100] that includes a laser amplifier [112] and an acousto-optic filter [110] (AOTF). The AOTF [110] includes a waveguide having first and second ports [185,186]. A first polarization filter [123] passes light of a first polarization state, the first polarization filter [123] being located between the laser amplifier [112] and the first port [185] of the AOTF [110]. The laser [100] also includes a first asymmetrical polarization rotator [154] located between the first port [185] of the AOTF [110] and the first polarization filter [123]. The first asymmetrical polarization rotator [185] rotates the polarization of light traveling from the first port [185] of the AOTF [110] to the first polarization filter [123] by 90° while leaving unchanged the polarization of light traveling from the first polarization filter [123] to the first port [185] of the AOTF [185]. A reflector [120] reflects light leaving the second port [186] of the AOTF [110] back into the second port [186] of the AOTF [110]. A second polarization filter [153] located between the mirror [120] and the second port [186] of the AOTF [110] passes light of a second polarization state which is orthogonal to the first polarization. A second asymmetrical polarization rotator [155] is located between the second port [186] of the AOTF [110] and the second polarization filter [153]. The second asymmetrical polarization rotator [155] rotates the polarization of light traveling from the second polarization filter [153] to second port [186] of the AOTF [110] by 90° while leaving unchanged the polarization of light traveling from the second port [186] of the AOTF [110] to the second polarization filter [153].
摘要翻译： 可调激光器[100]包括一个激光放大器[112]和一个声光滤波器[110]（AOTF）。 AOTF [110]包括具有第一和第二端口的波导[185,186]。 第一偏振滤波器[123]通过第一偏振态的光，第一偏振滤波器[123]位于激光放大器[112]和AOTF [110]的第一端口[185]之间。 激光器[100]还包括位于AOTF [110]的第一端口[185]和第一偏振滤光器[123]之间的第一不对称偏振旋转器[154]。 第一不对称偏振旋转器[185]将从AOTF [110]的第一端口[185]传播到第一偏振滤光器[123]的光的偏振旋转90°，同时保持从第一偏振 过滤[123]到AOTF [185]的第一个端口[185]。 反射器[120]将离开AOTF [110]的第二端口[186]的光反射回AOTF [110]的第二端口[186]。 位于AOTF [110]的反射镜[120]和第二端口[186]之间的第二偏振滤光器[153]传递与第一偏振正交的第二偏振状态的光。 第二非对称偏振旋转器[155]位于AOTF [110]的第二端口[186]和第二偏振滤波器[153]之间。 第二不对称偏振旋转器[155]将从第二偏振滤光器[153]传播到AOTF [110]的第二端口[186]的光的偏振旋转90°，同时保持从第二端口[ AOTF [110]的第一偏振滤波器[186]输出到第二偏振滤波器[153]。
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57.发明公开Polarization-independent, tunable, acousto-optical waveguide device for the wavelength selection of an optical signal 失效Polarisationsunabhängigeabstimmbare akusto-optische Wellenleitervorrichtung zurWellenlängenselektioneines optischen Signals
公开(公告)号：EP0814362A1
公开(公告)日：1997-12-29
申请号：EP96109993
申请日：1996-06-20
申请人： PIRELLI CAVI SPA
发明人： PIRELLI CAVI S P A
CPC分类号： G02F1/125 , G02F1/335 , G02F2001/0142 , G02F2203/055 , G02F2203/06
摘要： An acousto-optical waveguide device for the wavelength selection of an optical signal comprises two polarization conversion stages (3, 103), one polarization selective input element (4), one polarization selective output element (105) and two intermediate polarization selective elements (5, 104) located at the output of the first conversion stage (3) and at the input of the second conversion stage (103), respectively; the intermediate polarization selective elements (5, 104) have two branches connected together (18, 110) and two branches not connected together (16, 111) located on opposite sides with respect to the branches connected together (18, 110).
摘要翻译： 用于光信号的波长选择的声光波导器件包括两个偏振转换级（3,103），一个偏振选择输入元件（4），一个偏振选择输出元件（105）和两个中间偏振选择元件（5） ，104）分别位于第一转换级（3）的输出端和第二转换级（103）的输入端; 中间偏振选择元件（5,104）具有两个连接在一起的分支（18,110）和两个不连接在一起的分支（16,111），分支相对于连接在一起的分支（18,110）的相对侧。
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公开(公告)号：EP0806696A2
公开(公告)日：1997-11-12
申请号：EP97303182.6
申请日：1997-05-09
IPC分类号： G02F1/125
CPC分类号： G02F1/125
摘要： A process for the manufacture of an acousto-optic tunable filter (AOTF) employs a single soaking step at an elevated temperature for an extended period. A suitable dopant such as titanium is deposited on a substrate typically of lithium niobate, in three parallel strips so that following soaking, an optical waveguide is formed between regions defining the limits of the acoustic waveguide. The thickness and linewidth of the deposited dopant which forms the optical waveguide are selected having regard to the soaking period required to form the acoustic waveguide, so that a predetermined mode geometry for the optical waveguide will be formed in substantially the same soaking period as is required to form the acoustic waveguide.
摘要翻译： 用于制造声光可调滤波器（AOTF）的方法在高温下采用单次均热步骤长时间。 将合适的掺杂剂如钛沉积在通常为铌酸锂的衬底上，以三个平行的条带沉积，使得在浸泡之后，在限定声波导的极限的区域之间形成光波导。 考虑到形成声波导所需的均热周期，选择形成光波导的沉积的掺杂剂的厚度和线宽，使得用于光波导的预定模式几何形状将形成在与所需的基本相同的均热周期 以形成声波导。
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公开(公告)号：EP0788010A1
公开(公告)日：1997-08-06
申请号：EP97300363.5
申请日：1997-01-21
发明人： Chang, Kok-Wal , Aronson, Lewis B.
IPC分类号： G02F1/125
CPC分类号： G02F1/125
摘要： A polarization independent acousto-optical tunable filter (AOTF). The AOTF is fabricate with two waveguides [33] [35] formed on a single substrate [31]. An incoming polarization independent beam of light is split into TE and TM optical components with a walk-off crystal [37] wherein each optical component is coupled into a different one of the two waveguides [33] [35]. The AOTF can be formed to provide two stages of filtering. The two stages of filtering can be realized be providing two successive stages or by passing the optical signal through the same filter twice. Various configurations are obtained by placing TM and TE polarizers within the optical path traveled by the incoming beam of light.
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公开(公告)号：EP0749591A1
公开(公告)日：1996-12-27
申请号：EP95908349.0
申请日：1995-02-17
CPC分类号： G02F1/335 , G02F1/0134 , G02F1/125 , G02F1/3131 , G02F2201/124
摘要： An optical device comprises an optical fibre directional coupler having at least a first optical fibre (10) optionally coupled at a coupling region (30) to a second optical fibre (20) such that light can propagate in the coupling region in at least two possible electromagnetic transmission modes; and means (40, 50, 60) for transferring energy between the modes by a spatially periodic perturbation (e.g. a flexural acoustic vibration or an electric field generated by a pair of interdigital electrodes) of at least a part of the coupling region.
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