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公开(公告)号：EP1080520B1
公开(公告)日：2003-03-19
申请号：EP99915910.6
申请日：1999-04-09
发明人： LAMING, Richard, Ian , ZERVAS, Michael, Nickolaos , SET, Sze, Yun , IBSEN, Morten , RONNEKLEIV, Erland , YAMASHITA, Shinji
CPC分类号： G02B6/02138 , G02B6/02109 , H01S3/0675
摘要： A method of fabricating a distributed feedback optical fibre laser, comprises the step of exposing an optical fibre (20) to a transverse light beam (30) to form a grating structure in a section of the optical fibre, the writing light beam being polarised in a direction not parallel to the axis of the section (10) of optical fibre (20).
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公开(公告)号：EP0846353A1
公开(公告)日：1998-06-10
申请号：EP96928548.0
申请日：1996-08-23
发明人： SAMSON, Bryce, Neilson , HEWAK, Daniel, William Little Staplewood , LAMING, Richard, Ian , PAYNE, David, Neil , BROCKLESBY, William, Simon
CPC分类号： C03C3/321 , C03C4/0071 , C03C13/043 , H01S3/06716 , H01S3/1613
摘要： An optical fibre amplifier, laser or superluminescent source, consisting of a chalcogenide glass matrix hosting trivalent rare earth ions and which is doped with oxide in the form of a metallic oxide. The device utilizes the properties of the added oxide to improve the fabrication and efficiency of optical waveguide sources, in particular for applications around 1.3 νm. Specifically, the oxide broadens the wavelenght range for pump absorption, broadens the wavelength range for light emission, increases the device efficiency through a change in lifetime of certain laser levels and modifies properties of the glass to prevent crystallization during fibre fabrication. The device exploits the intentional addition of oxide to improve amplifier, laser, glass and fibre properties.
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公开(公告)号：EP0756767A1
公开(公告)日：1997-02-05
申请号：EP95916756.0
申请日：1995-04-24
IPC分类号： H01S3
CPC分类号： H01S3/06716 , H01S3/1606 , H01S3/1618 , H01S3/1698 , H01S3/17
摘要： PCT No. PCT/GB95/00928 Sec. 371 Date Feb. 26, 1997 Sec. 102(e) Date Feb. 26, 1997 PCT Filed Apr. 22, 1995 PCT Pub. No. WO95/29522 PCT Pub. Date Nov. 2, 1995The core of a low phonon energy glass optical fibre is doped with trivalent Dysprosium ions for application as an efficient optical fibre amplifier operating around 1.3 mu m. The device utilises the transition 6H9/2-6F11/2 to 6H15/2. The low phonon energy (high quantum efficiency) glasses include mixed halides, chalcogenides and chalcohalides. Improvements in efficiency can be achieved by co-doping of the fibre core with Eu3+ and/or Tb3+ ions.
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公开(公告)号：EP1012645B1
公开(公告)日：2002-09-18
申请号：EP98917409.9
申请日：1998-04-20
发明人： LAMING, Richard, Ian , DONG, Liang
CPC分类号： G02B6/2932 , G02B6/02042 , G02B6/2835 , G02B6/29383 , G02B2006/2839
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公开(公告)号：EP0760111B1
公开(公告)日：2002-08-21
申请号：EP95919514.0
申请日：1995-05-19
CPC分类号： H01S3/06708 , G02B2006/2839 , G02F1/3523 , G02F2201/02 , G02F2202/06 , G02F2203/055 , H01S3/06737 , H01S3/0675 , H01S3/06754 , H01S3/08022 , H01S3/08027 , H01S5/141 , H01S5/146
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公开(公告)号：EP1080520A1
公开(公告)日：2001-03-07
申请号：EP99915910.6
申请日：1999-04-09
发明人： LAMING, Richard, Ian , ZERVAS, Michael, Nickolaos , SET, Sze, Yun , IBSEN, Morten , RONNEKLEIV, Erland , YAMASHITA, Shinji
CPC分类号： G02B6/02138 , G02B6/02109 , H01S3/0675
摘要： A method of fabricating a distributed feedback optical fibre laser, comprises the step of exposing an optical fibre (20) to a transverse light beam (30) to form a grating structure in a section of the optical fibre, the writing light beam being polarised in a direction not parallel to the axis of the section (10) of optical fibre (20).
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公开(公告)号：EP1012645A1
公开(公告)日：2000-06-28
申请号：EP98917409.9
申请日：1998-04-20
发明人： LAMING, Richard, Ian , DONG, Liang
CPC分类号： G02B6/2932 , G02B6/02042 , G02B6/2835 , G02B6/29383 , G02B2006/2839
摘要： An optical fibre coupler has at least an m-core optical fibre (100) optically coupled to an n-core optical fibre (110), where m and n are positive integers and m is greater than 1. A channel add/drop multiplexer comprises such an optical fibre coupler and a Bragg grating (130) disposed on the m-core fibre outside the coupling region (120).
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公开(公告)号：EP0826161B1
公开(公告)日：2000-06-28
申请号：EP96915103.4
申请日：1996-05-14
IPC分类号： G02B6/16
CPC分类号： G02B6/02152 , G02B6/02085 , G02B6/02138
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公开(公告)号：EP1004045A1
公开(公告)日：2000-05-31
申请号：EP98936525.9
申请日：1998-07-28
发明人： LAMING, Richard, Ian
CPC分类号： G02B6/2932 , G02B6/12007 , G02B6/2938 , G02B2006/12107 , G02B2006/12109 , G02B2006/12164 , H04J14/0208 , H04J14/0209 , H04J14/0213 , H04J14/0219
摘要： An optical wavelength division demultiplexing apparatus for demultiplexing a multiplexed optical signal having a plurality of channels occupying respective wavelength bands. The apparatus comprising at least one waveband selector (10, 11) that acts to select wavelength bands corresponding to non-adjacent channels, the selected wavelength bands being routed to an associated array demultiplexer (30, 31) that outputs the selected wavelength bands as a parallel array of channels.
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公开(公告)号：EP0925522A2
公开(公告)日：1999-06-30
申请号：EP97939091.0
申请日：1997-09-10
发明人： LAMING, Richard, Ian , RICHARDSON, D., J. , CULVERHOUSE, David , YUN, Seok, Hyun , FARWELL, Selina, G. , ZERVAS, Michael, Nickoloas , BIRKS, Timothy, Adam
IPC分类号： G02F1
CPC分类号： G02F1/0134 , G02F1/3131
摘要： An optical fibre device comprises an optical fibre null coupler (10) formed of two or more optical fibres (20, 30) fused together at a coupling region, at least a part of the coupling region being mechanically twisted substantially about a longitudinal axis of the coupling region. The twisting can alleviate the polarisation dependance observed in untwisted null coupler devices. In other embodiments of the invention, substantially polarization-insensitive operation of a null coupler acousto-optic tunable filter is obtained by simultaneously applying two acoustic waves.The two waves provide phase-matched coupling for each of the individual eigen-polarization states. The polarization dependence of the device to excitation at one of the acoustic frequencies leads to two different filter responses, one corresponding to each polarisation. One of these two responses will be at higher optical wavelength than the other, and if a particular input polarisation gives rise to, say, the higher optical wavelength filter response of the pair at a particular acoustic frequency it will do so at other acoustic frequencies. So, if two acoustic frequencies are applied, the acoustic frequencies can be selected so that the higher wavelength response of the two filter responses from one acoustic frequency overlies in optical wavelength the lower wavelength response of the two filter responses from the other acoustic frequency, then the combination of the two overlying filter responses (which relate to the two different input polarisations) provides a substantially polarisation independent filter response.
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