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公开(公告)号：EP0072678A3
公开(公告)日：1983-03-09
申请号：EP82304278
申请日：1982-08-12
申请人： THE POST OFFICE
发明人： Thake, Roy Charles
摘要： A receptacle for flat sheet-like items, for example letters, is incorporated in a machine, for example a letter sorting machine, which includes first conveyor means (2) arranged to deposit the items in a laid flat position in the receptacle. The receptacle incorporates a second conveyor (4) which is arranged to receive and support the items being stacked, and is operable to move these items away from the loading position in such manner that apart from an initially formed stack, the items adopt a successively overlapping relationship in the receptacle.
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公开(公告)号：EP0044712A3
公开(公告)日：1982-08-04
申请号：EP81303273
申请日：1981-07-16
申请人： THE POST OFFICE
IPC分类号： G02B05/14 , C03B37/075 , C03B37/025
CPC分类号： G02B6/03633 , C03B37/018 , C03B37/01861 , C03B2203/24 , C03C13/045 , G02B6/03627 , Y10S65/90
摘要： A glass fibre for optical communication is formed by a vapor deposition process on the inside surface of pure silica substrate tube. The substrate forms the outer cladding whilst the inner and core are formed by the deposited layers. An intermediate layer of the cladding has a refractive-index similar to pure silica but due to compensating dopants. Thus deposition and sintering temperature is reduced. The inner layer of the cladding is however undoped pure silica, thus reducing absorption losses in this important region. A step in a process for making optical fibres comprising collapsing a tubular substrate to provide a preform is carried out in a stream of pure chlorine vapour acting as a drying agent.
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33.发明公开
公开(公告)号：EP0046351A1
公开(公告)日：1982-02-24
申请号：EP81303568.0
申请日：1981-08-05
申请人： THE POST OFFICE
CPC分类号： H04Q11/04 , H04B10/2504
摘要： An electronic telephone exchange of the type employing time-space-time switching, has an optical fibre data link connecting the space (3) and time switches (2,4). In order to meet the design requirements for use in a telephone exchange, the fibre optic link has to have fairly well defined performance parameters. In particular the overall diameters of the optical fibres (16) employed in the optical fibre link lies between 180 and 250 microns, preferably 200 microns, and the core diameter of the optical fibres (16) lies in the range 0.6 to 0.95 of the cladding diameter. Preferably the core diameter lies in the range 160 to 180 microns. The optical fibre link is characterised by the numerical aperture of the fibre, insertion loss of the fibre, sensitivity and dynamic range of the receiver (19) and the power output and extinction ratio of the transmitter (13).
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公开(公告)号：EP0002363B1
公开(公告)日：1981-12-23
申请号：EP78300697.6
申请日：1978-11-30
申请人： THE POST OFFICE
CPC分类号： H04R31/00 , H01G7/02 , H04R7/18 , H04R19/00 , H04R31/006 , Y10T29/49005
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公开(公告)号：EP0039174A1
公开(公告)日：1981-11-04
申请号：EP81301648.2
申请日：1981-04-14
申请人： THE POST OFFICE
CPC分类号： H01L23/53247 , H01L23/53242 , H01L23/53252 , H01L2924/0002 , H01L2924/00
摘要： Gold is preferred as the conductor material in metallisation layer (4) of a semiconductor device because of its high conductivity and freedom from electromigration effects but gold is inclined to diffuse into the semiconductor substrate (1),typically silicon, so degrading the p-n junction characteristics within the semiconductor substrate and rendering the device inoperative. Previously this problem has been overcome by placing a protective barrier layer of titanium (3) between the gold layer (4) and the substrate (1). The gold/titanium interface is subject to corrosion and this corrosion adjacent the substrate (1) contrining the active areas of the device also leads to failure of the device. This is prevented by covering the gold metallisation layer (4) ofthe device on its top (5), bottom (3) and side surfaces (7) with titanium. This prevents the diffusion of the gold into any other layer (1, 2, 8) of the semiconductor device above or below it and there is no gold/titanium interface exposed adjacent any active area of the device.
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公开(公告)号：EP0018109A3
公开(公告)日：1981-07-15
申请号：EP80300952
申请日：1980-03-27
申请人： THE POST OFFICE
CPC分类号： C03C3/089 , C03C13/046 , C03C21/00
摘要： Graded index optical fibres can be made by a double crucible technique in which the refractive index gradation is induced by thermal diffusion. In fibre made from alkali- boro-alkaline earth-silica glasses, the refractive index variation in the fibre is improved if the core and cladding glass compositions are selected so that no simple ion-exchange processes occur. These fibres have improved bandwith. Preferred glass compositions for the core contain 55-65 mole per cent silica, 10-20 mole per cent boric oxide, 14 to 25 mole per cent sodium oxide, and up to 20 mole per cent of alkaline earth oxide, preferred glass composition for the cladding contain 55-65 mole per cent silica, 10-20 mole per cent boric oxide, 19-25 mole per cent sodium oxide, and the cladding glass contains the same amount or less sodium oxide than the core.
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37.发明公开Method of precisely locating the end of a dielectric optical waveguide in a waveguide coupling device 失效一种用于在光导Kupplingseinrichtung一个介质光波导的端部的精确放置过程。
公开(公告)号：EP0022374A1
公开(公告)日：1981-01-14
申请号：EP80302310.0
申请日：1980-07-08
申请人： THE POST OFFICE
IPC分类号： G02B7/26
CPC分类号： G02B6/3841 , G02B6/2552 , G02B6/262 , G02B6/2817 , G02B6/32 , G02B6/3825 , G02B6/3827 , G02B6/3829 , G02B6/3874
摘要： A technique for aligning and coupling dielectric optical waveguides comprises threading the end of waveguide 20 through the central opening of a triad ball connector and forming by fusion a generally spherical glass bead 24 on the end of the waveguide using, for example, an electric arc. The waveguide is then drawn back so that the bead 24 contacts the balls of the triad connector to accurately locate the waveguide. The bead acts as a locating element and also has beneficial focussing properties.
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公开(公告)号：EP0018834A1
公开(公告)日：1980-11-12
申请号：EP80301437.2
申请日：1980-05-01
申请人： THE POST OFFICE
IPC分类号： H04M3/36
CPC分类号： H04M3/36
摘要： The availability of service in a telephone exchange is evaluated by a technique which includes monitoring for each call type over a period oftimethe level of usage of the items of equipment required forthat call type and evaluating using the monitored data the probability of each particular item not being able to provide a service when required. The probability figures of the call types can be combined to give an index figure indicative of the availability of service of the exchange.
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39.发明公开Optical fibre core glass, optical fibres containing such glass and process for the manufacture of such glass 无效玻璃用于光学纤维的芯，包含纤维和制造这种玻璃的方法此玻璃。
公开(公告)号：EP0018110A1
公开(公告)日：1980-10-29
申请号：EP80300953.9
申请日：1980-03-27
申请人： THE POST OFFICE
CPC分类号： C03C3/064 , C03C3/089 , C03C13/046
摘要： A glass suitable for use as the core glass in a high numerical aperture optical fibre has a composition calculated by taking a notional soda-boro-silicate glass having the following composition range: soda 15-25 mol%, boric oxide 0-20 mol%, silica 25-65 mol%; and substituting up to 12 mol% of boric oxide by barium oxide, and up to 42 mol% of silica by germania. The glass can be prepared by controlling the partial oxygen pressure of the melt so that it is approximately 10 -5 atmospheres. An optical fibre can be produced, by using a soda-boro-silicate clad glass, and a core glass having the composition in the above range.
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公开(公告)号：EP0016575A1
公开(公告)日：1980-10-01
申请号：EP80300659.2
申请日：1980-03-05
申请人： THE POST OFFICE
CPC分类号： G02B6/3841 , G02B6/3873
摘要： In a dielectric optical waveguide device two optical fibres (2) to be coupled end-to-end are respectively located within a cluster of straight rigid elements (1). The meeting ends (4) of the elements are tapered to provide docking ramps which ensure precise axial alignment of the clusters.
摘要翻译： 在电介质光波导器件中，要端对端耦合的两根光纤（2）分别位于直刚性元件（1）的簇内。 元件的会议端（4）是锥形的，以提供对接斜坡，其确保簇的精确轴向对准。
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