Abstract: This disclosure describes a wavelength division multiplexing passive optical network system (100) comprising an optical line terminal (180) for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator (110) connected to the optical line terminal (180) for determining the transmission paths of the optical signals; a splitter (120) connected to the circulator (110) for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier (160) connected to the splitter (120) for amplifying the second portion of optical signals; and a modulator (170) connected in between the amplifier (160) and the splitter (120) for modulating the amplified second portion of optical signals to be transmitted to the circulator (110); a converter (140) connected to the splitter (130) for converting the fi

Abstract: The present invention discloses an optical line terminal that includes one or more downstream signal processing means for generating a downstream signal, and converting data of the downstream signal into a serial data; a wavelength division multiplexing means for combining the serial data of different wavelengths together and then performing transmission of the combined signals; and one or more upstream signal processing means for extracting data of an upstream signal from the wavelength division multiplexing means. The terminal includes an extender including a first optical amplifier for amplifying the upstream signal, a second optical amplifier for amplifying the downstream signal, a Raman wavelength division multiplexing module for separating and combining data signal and pump light from Raman pump unit, and a Raman pump unit coupled to the Raman wavelength division multiplexing module to provide Raman amplification to the upstream and downstream signals.

Abstract: The present invention provides an improved optical communication network (300) that utilizes an apparatus of optical channel protection. The apparatus for optical channel protection of the present invention including a transmitting end network switch (200), a first and a second receiving end network switch (201, 202), a plurality of wavelength tuneable transmitting end transponders (400, 401 . . . 405), a plurality of wavelength tuneable receiving end transponders (400?, 401? . . . 405?), a transmitting end controller (10a) connected to a network monitoring and control system (100a) and a receiving end controller (10b) connected to said network monitoring and control system (100a). The present invention utilizes a method of optical channel protection that can be broadly categorized under optical multiplex switching.

Abstract: This disclosure describes a wavelength division multiplexing passive optical network system (100) comprising an optical line terminal (180) for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator (110) connected to the optical line terminal (180) for determining the transmission paths of the optical signals; a splitter (120) connected to the circulator (110) for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier (160) connected to the splitter (120) for amplifying the second portion of optical signals; and a modulator (170) connected in between the amplifier (160) and the splitter (120) for modulating the amplified second portion of optical signals to be transmitted to the circulator (110); a converter (140) connected to the splitter (130) for converting the fi

Abstract: A passive optical network (100) with immediate fault protection comprises an optical line termination (OLT) (11), an optical distribution network communicating with the OLT (11), the optical distribution network comprising a splitter (13) connected to the OLT (11) through a feed fiber (15) for separating and distributing optical signals from the OLT (11), a plurality of optical network units (ONUs) (17) each connected to the splitter (13) through a distribution fiber (19), and characterized in that each ONU (17) is equipped with a wireless router (21) communicating with its adjacent wireless routers (21) to form a mesh-like wireless network, whereby when failure has occurred in any distribution fiber (19) connected to the ONUs (17), the wireless router (21) of the disabled ONU (17) connected to the fiber (19) automatically searches and receives bandwidth from the nearest wireless router (21) of the ONU (17) connected to the functioning fiber (19) or wireless router (21) of disabled ONU (17) through the mesh-l

Abstract: The present invention provides an improved optical communication network (300) that utilizes an apparatus of optical channel protection. The apparatus for optical channel protection of the present invention including a transmitting end network switch (200), a first and a second receiving end network switch (201, 202), a plurality of wavelength tuneable transmitting end transponders (400, 401 . . . 405), a plurality of wavelength tuneable receiving end transponders (400?, 401? . . . 405?), a transmitting end controller (10a) connected to a network monitoring and control system (100a) and a receiving end controller (10b) connected to said network monitoring and control system (100a). The present invention utilizes a method of optical channel protection that can be broadly categorized under optical multiplex switching.