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    • 55. 发明公开
    • Optical communication method and optical communication system
    • OptischesÜbertragungsverfahrenund optischesÜbertragungssystem。
    • EP0438153A2
    • 1991-07-24
    • EP91100520.5
    • 1991-01-17
    • CANON KABUSHIKI KAISHA
    • Nakamura, Kanji, c/o Canon Kabushiki KaishaNitta, Jun, c/o Canon Kabushiki Kaisha
    • H04Q11/00H04J14/02
    • H04J14/0227H04J14/0224H04J14/0241H04J14/0282H04Q11/0001H04Q2011/0081
    • Disclosed is a method of and an apparatus for conducting communications using an optical communication system that includes a plurality of light transmitters and a plurality of light receivers mutually connected to the plurality of light transmitters. The communication method includes detecting, from a predetermined wavelength range, first and second wavelengths in one of the light transmitters, which wavelengths are different from each other and which have not been used by other light transmitters; conducting communications between one of the light transmitters and one of the light receivers using light having the first wavelength; and conducting communications between the light transmitter and the light receiver using light having the second wavelength when the quality of the communications using the light having the first wavelength deteriorates. Also disclosed is a method of and an apparatus for conducting communications using an optical communication system that includes a plurality of mutually connected light transceivers. This communication method includes conducting communications between those light transceivers which are a selected pair of light transceivers using light having a set wavelength; detecting interference in the communications between the selected pair of light transceivers and interference in those light transceivers other than the selected pair; and shifting the set wavelength to avoid the interference when interference is detected.
    • 公开了一种使用包括多个光发射机和多个彼此连接到多个光发射机的光接收机的光通信系统进行通信的方法和装置。 通信方法包括:从预定波长范围检测一个光发射机中的第一和第二波长,这些波长彼此不同,并且未被其它光发射机使用; 使用具有第一波长的光进行光发射器之一与一个光接收器之间的通信; 以及当使用具有第一波长的光的通信的质量劣化时,使用具有第二波长的光,在光发射器和光接收器之间进行通信。 还公开了一种使用包括多个相互连接的光收发器的光通信系统进行通信的方法和装置。 该通信方法包括使用具有设定波长的光进行作为所选择的一对光收发器的那些光收发器之间的通信; 检测所选择的一对光收发器之间的通信中的干扰以及除了所选择的对之外的那些光收发器的干扰; 并且当检测到干扰时,移位设定的波长以避免干扰。
    • 57. 发明公开
    • Hybrid network
    • Netzwerk的Hybrides。
    • EP0421602A2
    • 1991-04-10
    • EP90309559.4
    • 1990-08-31
    • NORTHERN TELECOM LIMITED
    • Powell, William Hugh
    • H04Q11/02H04B10/12H04Q7/00
    • H04Q11/0001H04B10/25751H04M1/725
    • An hybrid network providing a range of services for subscribers, which services are separated by frequency allocation and include cordless telephony. The otherservices may comprise broadcast TV, premium TV, data, hi-fi etc. The network employs optical fibre (4) between a head end Cable TV (1) and telephony exchange (2) and intermediate distribution points (6) and coaxial cable (7, 9) from thence to the interior of the subscribers premises and a radio interface. Within the premises two-way cordless telephony operation is achieveable. A cordless telephony base station (11) can be provided at the intermediate distribution point (6) to provide outgoing call facilities for cordless telephones outside of the premises and within range thereof.
    • 为用户提供一系列服务的混合网络,这些服务由频率分配分隔,包括无绳电话。 其他服务可以包括广播电视,付费电视,数据,高度适配等。网络使用头端有线电视(1)和电话交换机(2)之间的光纤(4)和中间分配点(6)和同轴电缆 (7,9)从用户房屋的内部到无线电接口。 在该处所内,双向无绳电话操作(13-Fig 2)是可实现的。 可以在中间分配点(6)处提供无绳电话基站(11),以在房屋外部及其范围内提供用于无绳电话的呼出设施。
    • 58. 发明公开
    • Clock distribution arrangement for time-multiplexed switched optical network
    • Netzwerk的最佳选择是Taktverteilungsvorrichtungfürein zeitmultiplexgeschaltetes。
    • EP0385644A1
    • 1990-09-05
    • EP90301851.3
    • 1990-02-21
    • AT&T Corp.
    • Azizi, AlirezaKorotky, Steven K.
    • H04B10/20H04J3/00H04Q3/00
    • H04Q11/0001H04L7/0075
    • In an optical time-multiplexed switched communication system, a master clock signal is distributed optically to subscribers (10,11,12,13) via a central switch (20). The switch (20) modulates a portion of an optical data signal with a representation of the master clock signal prior to its broadcast to a selected subscriber. Several different embodiments of the switch are described for modulating contiguous bit positions reserved within the optical data signal. One embodiment is described for continuously modulating the envelope of the optical data signal with a low amplitude representation of the master clock signal. All embodiments of the switch eliminate both the need for a separate network for broadcasting the master clock signal to subscribers and the need for allocating a specific wavelength to broadcast the master clock signal.
    • 在光时分复用交换通信系统中,主时钟信号经由中央交换机(20)以光学方式分配给用户(10,11,12,13)。 开关(20)在其广播到选定的用户之前用主时钟信号的表示来调制光数据信号的一部分。 描述了用于调制在光学数据信号中保留的连续位位置的开关的若干不同实施例。 描述一个实施例用于以主时钟信号的低幅度表示连续调制光数据信号的包络。 交换机的所有实施例都消除了对用于向订户广播主时钟信号的单独网络的需要,以及分配特定波长以广播主时钟信号的需要。
    • 59. 发明公开
    • Wavelength-division switching system for optical frequency-shift keying signals
    • Wellenlängenmultiplexermittlungssystemfüroptische Frequenzumgetastete Signale。
    • EP0380126A2
    • 1990-08-01
    • EP90101596.6
    • 1990-01-26
    • NEC CORPORATION
    • Nishio, Makoto, c/o NEC Corporation
    • H04J14/02
    • H04Q11/0001
    • An optical switching system comprises an input terminal for receiving an optical wavelength-division multiplexed (WDM) signal in which optical signals differing in center wavelength i (i = 1 to N) are wavelength-division multiplexed, the optical signal being an optical frequency-­shift keying (FSK) signal which is a first optical FSK signal F i . A splitter splits the optical WDM signal correspondingly to the wavelengths λ i to generate optical wavelength-corresponding WDM signals W i . Wavelength extracting circuits extract optical FSK signals F j (j = 1 to N) pertaining to wavelengths λ j , to which the wavelengths λ i are to be switched, from the optical wavelength-corresponding WDM signals W i to generate optical amplitude-shift keying (ASK) signals A j pertaining to the wavelengths λ j to be switched to. Wavelength switches switch the optical ASK signals A j to second optical FSK signals F i corresponding to the wavelengths λ i . A wavelength multiplexer wavelength-­multiplexes the second optical FSK signals F i into an optical switched WDM signal. This optical WD switching system reduces the signal deterioration due to crosstalk by optical signals of wavelengths other than that to be selected when an optical signal of a certain wavelength are being selected by a tunable or a fixed wavelength filter.
    • 光开关系统包括:输入端,用于接收中波长i(i = 1至N)不同的光信号被波分复用的光波分复用(WDM)信号,光信号是光频分复用 移位键控(FSK)信号,它是第一个光学FSK信号Fi。 分光器将光学WDM信号对应于波长λi分裂以产生与光学波长相关的WDM信号Wi。 波长提取电路从光波长对应的WDM信号Wi提取属于要被切换波长λi的波长λj的光学FSK信号Fj(j = 1至N),以产生光学振幅键控(ASK )信号关于要切换到的波长λj的Aj。 波长开关将光学ASK信号Aj切换到对应于波长λi的第二光学FSK信号Fi。 波长多路复用器将第二光FSK信号Fi复用到光交换WDM信号中。 该光学WD切换系统通过可调波长或固定波长滤波器选择某一波长的光信号时选择的波长以外的波长的光信号,由于串扰而降低信号劣化。