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公开(公告)号：EP0931274A1
公开(公告)日：1999-07-28
申请号：EP97944968.0
申请日：1997-10-08
发明人： ROBINSON, Alan
IPC分类号： G02B6
CPC分类号： G02B6/29317 , G02B6/02085 , G02B6/29389
摘要： A distributed Bragg reflection pass-band filter in an optical fibre waveguide (170) is provided by grating elements (172) arranged to provide improved flatness of reflection pass-band, a high rate of roll-off, and reduced amplitude side-bands by the use of nonlinear chirp and apodisation profiles that are related such that the square of the coupling coefficient is substantially proportional to the rate of change of chirp.
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公开(公告)号：EP0919005A1
公开(公告)日：1999-06-02
申请号：EP97933794.0
申请日：1997-07-30
CPC分类号： G02B6/12014 , G02B6/12021 , G02B6/124 , G02B2006/12107
摘要： An optical multiplexer/demultiplexer with an improved spectral characteristic is provided by two diffraction gratings (61, 60) arranged optically in tandem, the gratings being arranged to provide free spectral ranges differing by a factor of at least two, and having a coupling between them that carries over into the second grating information concerning the dispersion afforded by the first grating.
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公开(公告)号：EP0513002A1
公开(公告)日：1992-11-19
申请号：EP90917395.0
申请日：1990-11-30
IPC分类号： H01S5
CPC分类号： H01S5/06832
摘要： Un circuit de commande de diode à laser assure une puissance de sortie moyenne voulue de la diode à laser (10) en détectant (18) la sortie optique, en amplifiant (24) la sortie détectée et en commandant de manière appropriée le courant de polarisation (14) de la diode à laser. Un signal pilote (20) est associé à la sortie détectée (18) et amplifié avec celle-ci, et le niveau amplifié (24) du signal est détecté (22) et utilisé pour commander (26) un courant de modulation (16) pour la diode à laser. Dans un des agencements décrits la diode à laser (10) est commandée de manière à posséder un rapport élevé d'extinction lorsque le courant de polarisation est situé au coude (42) de la courbe caractéristique de la diode, et dans un autre agencement, un rapport d'extinction inférieur est obtenu lorsque le courant de polarisation est situé au-dessus du coude (42).
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公开(公告)号：EP0891570A1
公开(公告)日：1999-01-20
申请号：EP97906822.0
申请日：1997-03-06
IPC分类号： G02B6
CPC分类号： G02B6/4206 , G02B6/4203
摘要： An assembly for combining the outputs from a group of n single mode optical fibres on to the photosensitive surface of a photodetector (1) has an adiabatically tapered bundle (2) of fibres (3) the small end of which is fusion spliced to one end of a length (4) of multimode fibre whose other end is optically coupled with the detector (1) by means of a lens (5).
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公开(公告)号：EP0812517A1
公开(公告)日：1997-12-17
申请号：EP95922390.0
申请日：1995-06-28
摘要： A cellular packet data arrangement includes an interface unit (NIU) to a packet data network and link interface units (LIUs) each providing a channel to a respective radio transceivers for communicating data packets with mobile terminals each having an individual identifier (TEI). Each LIU stores the TEI, channel number, and protocol data for communications with each mobile terminal handled by the LIU. In response to a first LIU receiving a communication from a mobile terminal whose communications have previously been on a channel handled by a second LIU, this is identified from the mobile terminal's TEI not being stored in the first LIU and being stored in the NIU in respect of the second LIU, and the protocol data for the mobile terminal is transferred from the second to the first LIU. To avoid a possible error condition, the first LIU can suppress a reply to the communication from the mobile terminal until this is resent.
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公开(公告)号：EP0879435A1
公开(公告)日：1998-11-25
申请号：EP97902473.0
申请日：1997-02-05
CPC分类号： B29C66/69 , B29C65/4835 , B29C65/548 , B29C66/1122 , B29C66/526 , B29L2011/0075 , G02B6/3636 , G02B6/3652 , G02B6/3692 , G02B6/3861 , G02B6/423 , G02B6/4239
摘要： To minimise the risk of adhesive resin (20, 21) securing an optical fibre (11) in a silicon V-groove (13, 14) from filling the space under the fibre, which can lead to delamination effects resulting from thermal expansion mismatch, a controlled amount of the resin is dispensed into each of two reservoirs (31) located on either side of the groove from which the resin flows into the groove along feeder channels (32) linking the reservoirs to the groove.
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公开(公告)号：EP0776534A1
公开(公告)日：1997-06-04
申请号：EP96917597.0
申请日：1996-06-13
CPC分类号： H01S3/0675 , H01S3/0826 , H01S5/146
摘要： A laser has an optical laser cavity one end of which is constituted by a partial reflector formed in optical waveguide by an unbalanced Michelson interferometer comprising an optical waveguide splitter/combiner (23; 33) and two optical waveguide Bragg grating reflectors (24a, 24b; 34a, 34b; 44a, 44b).
摘要翻译： 一种激光器具有光学激光腔，其一端由在光波导中由不平衡迈克尔逊干涉仪形成的部分反射器构成，所述不平衡迈克尔逊干涉仪包括光波导分束器/组合器（23; 33）和两个光波导布拉格光栅反射器（24a，24b; 34a，34b; 44a，44b）。
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公开(公告)号：EP0708930A1
公开(公告)日：1996-05-01
申请号：EP94915483.0
申请日：1994-05-11
IPC分类号： G02F1
CPC分类号： G02F1/025 , G02F1/2257 , G02F2001/0151 , G02F2001/212 , G02F2201/12
摘要： A semiconductor-based optical phase-modulating device has first and second pairs of phase-fixing electrodes bracketing a pair of phase-modulating electrodes. The phase-fixing electrodes fix electric fields across end regions of the phase-modulating device to reduce distributed resistance and capacitance of the phase-modulating device, thereby improving the frequency response of the phase-modulating device. The optical phase-modulating device is particularly applicable to use in integrated optic Mach-Zehnder interferometers used for optical signal modulation.
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公开(公告)号：EP0907993A1
公开(公告)日：1999-04-14
申请号：EP97928354.0
申请日：1997-06-25
CPC分类号： H04B10/2912 , H01S3/10023 , H04B10/291 , H04B10/2941 , H04B2210/003
摘要： A variable gain optical amplifier, in which homogeneous gain broadening is dominant, has first and second fixed gain rare-earth doped optical waveguide amplifiers (51, 53) optically in series together with an intervening variable attenuation optical attenuator (52). This arrangement circumvents the problem of gain tilt encountered when operating such amplifiers under variable gain conditions. An alternative form of the module has variable gain waveguide amplifiers, but these are co-regulated so that the aggregate of their gain at a wavelength within the gain spectrum is maintained constant. A further alternative form of module is employed in a concatenation of such modules. In such a concatenation, the gain of individual modules is allowed to vary, but the aggregate of the gain, at a wavelength within the gain spectrum, of all the waveguide amplifiers of all the modules of the concatenation is maintained constant.
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公开(公告)号：EP0876696A1
公开(公告)日：1998-11-11
申请号：EP97901693.0
申请日：1997-01-24
CPC分类号： G02B6/305 , H01S5/026 , H01S5/1014 , H01S5/1028 , H01S5/1032 , H01S5/1064
摘要： A 'big spot' semiconductor laser has a passive modal spot size transformer (2) formed integrally in tandem with the active region (1) of the laser. The passive transformer has a layer structure (5, 6) that supports a restricted set of modes and is designed such that, at the laser frequency, its length provides a phase slippage of π between modes of adjacent order.
摘要翻译： “大斑点”半导体激光器具有与激光器的有源区（1）串联地整体形成的无源模式点尺寸变压器（2）。 无源变压器具有支持有限组模式的层结构（5,6），并且被设计为使得在激光频率下，其长度在相邻阶模式之间提供π相位滑移。
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