Abstract: A fault protection method for optical networks is provided. The method includes monitoring intensity of downstream optical signals transmitted through a first route from a rear terminal of a primary optical channel, so as to determine if there occurs any fault; and activating a second route to transmit optical signals when a fault in the primary optical channel is detected, in which the second route is counter to the first route. The present invention also includes a system performing the fault protection method.

Abstract: The present invention provides an optical link monitoring method for the passive optical network. The method includes the steps of: determining a plurality of groups such that each group includes portion of a plurality of optical network units; connecting each of the plurality of groups to an optical splitter through an optical fiber link; determining status of the optical fiber links among an optical line terminal, the optical splitter and the plurality of groups according to the upstream optical signals or optical energy accepted by the optical line terminal. The present invention also provides an apparatus and a system to implement the method.

Abstract: The present invention provides an optical fiber monitoring system and method incorporated with an automatic fault protection mechanism. The optical fiber monitoring system includes a primary optical channel, a secondary optical channel, an optical channel fault examination device, a plurality of automatic fault protection devices, and a plurality of optical terminal equipments. When an automatic fault protection device detects a fault, it switches the connection of the optical terminal equipments from the primary optical channel to the secondary optical channel; meanwhile, a test optical channel is selected to be checked by the optical channel fault examination device.

Abstract: A fault protection method for optical fiber networks is provided. The method includes monitoring intensity of downstream optical signals transmitted through a first route from a rear terminal of a primary optical channel, so as to determine if there occurs any fault; and activating a second route to transmit optical signals when a fault in the primary optical channel is detected, in which the second route is counter to the first route. The present invention also includes a system performing the fault protection method.

Abstract: A method and an apparatus for switching channel connection between multiple optical channels synchronously and automatically. The apparatus employs an optical switch to interface among a plurality of optical channels, and an optical power meter to monitor data transmission over the plurality of optical channels by measuring the optical power level of optical signals over the channel. When signal transmission is detected over a specific optical channel, the optical switch is locked to the specific optical channel allowing data signals over the specific optical channel to be transmitted to a specific device or another optical channel through the optical switch. When no optical signal is detected over the channel, said optical switch will be switched to another optical channel, such that signal monitoring and switching channels among a plurality of optical channels is able to be performed synchronously and automatically.

Abstract: A method and an apparatus for switching channel connection between multiple optical channels synchronously and automatically. The apparatus employs an optical switch to interface among a plurality of optical channels, and an optical power meter to monitor data transmission over the plurality of optical channels by measuring the optical power level of optical signals over the channel. When signal transmission is detected over a specific optical channel, the optical switch is locked to the specific optical channel allowing data signals over the specific optical channel to be transmitted to a specific device or another optical channel through the optical switch. When no optical signal is detected over the channel, said optical switch will be switched to another optical channel, such that signal monitoring and switching channels among a plurality of optical channels is able to be performed synchronously and automatically.