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公开(公告)号:US5479286A
公开(公告)日:1995-12-26
申请号:US191501
申请日:1994-02-04
CPC分类号: H04N7/17318 , H04J14/0298 , H04N7/22
摘要: An optical fibre communications system includes a head end connected to n customers by an optical fibre network. The head end has a transmitter unit and a receiver unit, and each of the customers has an optical network unit with an optical receiver and a transmitter unit. The head end transmitter and receiver units are connected respectively to the receivers and the transmitter units of the customer optical network units by at least one passive optical network. The head end transmitter unit includes an optical transmitter driven by a sub-carrier multiplexer, the sub-carrier multiplexer having a plurality of input sub-carriers at different frequencies. One of the sub-carriers carries interactive signals provided by a further optical transmitter unit. The remaining sub-carriers carry broadband service signals. Each customer transmitter unit includes an optical transmitter and apparatus for multiplexing interactive signals and control signals to drive the optical transmitter. The head end includes a system control unit for controlling the transmission of broadband services by the head end transmitter unit in dependence upon the control signals received by the head end receiver unit from the customer transmitter units.
摘要翻译: 光纤通信系统包括通过光纤网络连接到n个用户的头端。 头端具有发射机单元和接收机单元,并且每个客户具有带有光接收机和发射机单元的光网络单元。 前端发射机和接收机单元通过至少一个无源光网络分别连接到客户光网络单元的接收机和发射机单元。 前端发送器单元包括由副载波复用器驱动的光发送器,副载波复用器具有不同频率的多个输入子载波。 一个子载波携带由另一个光发射机单元提供的交互信号。 其余的子载波承载宽带业务信号。 每个客户发射机单元包括光发射机和用于复用交互信号和控制信号以驱动光发射机的装置。 头端包括系统控制单元,用于根据头端接收机单元从客户发射机单元接收的控制信号来控制头端发射机单元的宽带业务的传输。