System and method for realizing multiple protection and extended functions of a three-dimensional passive optical access network
A passive optical access network and multiple protection technologies, applied in the field of optical communication, can solve problems such as limitations and loss of market competitiveness of operators
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Embodiment 1
[0031] see Figure 1-Figure 3 , the three-dimensional passive optical access network realizes multiple protection and expansion functions. An optical link terminal OLT (1) is connected to a remote node RN (14) through two single-mode feeder optical fibers (11, 12), The remote node RN (14) is connected to N (N≥1) optical network units ONU (27) through a distributed optical fiber (26); it is characterized in that:
[0032] 1) if figure 1 As shown, the optical link terminal OLT (1) includes N optical transmitters (2), which are connected to 1 of a first three-port optical circulator (5) after passing through a first arrayed waveguide grating AWG (4). mouth. Port 2 of the three-port optical circulator (5) is connected to a first erbium-doped fiber amplifier EDFA1 (6). The right end of the EDFA1 (6) is connected to a first photodetector D 1 (7). Port 3 of the three-port optical circulator (5) is connected to a second arrayed waveguide grating AWG (8), and another N optical rec...
Embodiment 2
[0037] A system for realizing multiple protection and extended functions of a three-dimensional passive optical access network proposed by the present invention uses the system of Embodiment 1 to operate as follows:
[0038] In normal working mode, N wavelengths (3) are generated by the transmitter array (2) of the optical link terminal OLT (1), and after being combined by the first AWG (4), they pass through the three-port optical circulator (5) , the first erbium-doped fiber amplifier (6) and the first photodetector D 1 After (7), connect to a 1×2 optical switch (10). Such as figure 1 As shown, in the normal working mode, the optical switch (10) is placed at the upper port position. Downlink direction: the downlink optical signal after N channels are combined by the first AWG (4) into 1 channel passes through a single-mode feeder fiber (11) and the output port of the 2×1 optical coupler (13) and then reaches the remote node RN (14). After the downlink signal passes throu...
Embodiment 3
[0040] The system proposed by the present invention has a three-dimensional passive optical access network to realize multiple protection and expansion functions, and the method for realizing multiple protection and dynamic wavelength scheduling is as follows:
[0041] 1) Special protection method for feeder
[0042] refer to Figure 4 , when the feeder fiber (11) between the optical link terminal OLT (1) and the remote node RN (14) fails, all the downlink N optical wavelengths (3) cannot reach the remote node RN (14 ), the first photodetector D located in the optical link terminal OLT(1) 1 (7) The loss of the optical signal will be detected, and a control signaling will be sent to switch the 1×2 optical switch (10) between the OLT (1) and the RN (14) from the upper port to the lower port. At this time, all N channels of optical wavelengths are transmitted to the remote node RN (14) through the dedicated feeder protection optical fiber (12), thereby ensuring normal communica...
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