TWM638881U - Optical fiber network signal access module that can access the same and different wavelengths - Google Patents

Abstract

This model proposes an optical fiber network signal access module that can access the same and different wavelengths, which can improve the convenience of use, including: the first wavelength division multiplexer, including common ports, reflection ports, and transmission ports and a filter element; the second wavelength division multiplexer is connected to the first wavelength division multiplexer, and the second wavelength division multiplexer includes a common port, a reflection port, a transmission port and a filter element, wherein the second wavelength division multiplexer can pass through the The wavelength of the optical signal of the filter element is the same as or different from the wavelength of the optical signal that can pass through the first filter element; and the first optical circulator includes three first communication ports, one of which is connected to the first wavelength division multiplexer One of the transmission port of the multiplexer and the transmission port of the second wavelength division multiplexer, the first communication port can receive optical signals of the same wavelength.

Description

Optical fiber network signal access module that can access the same and different wavelengths

The present invention relates to the technical field of an optical fiber network signal access module, in particular to an optical fiber network signal access module capable of accessing the same and different wavelengths.

Optical fiber is a kind of fiber made of glass or plastic. It is a light transmission tool that uses the principle of total reflection to transmit light in these fibers. It has the advantages of high speed, high capacity, good safety, low loss, light weight, and low cost. , so it has been widely used in the transmission of network signals.

In optical fiber network signal transmission, the working wavelength of the optical fiber can be divided into multiple channels, such as 80 channels, so that a larger amount of data can be transmitted in the same optical fiber. For example, a telecommunications company can use the same optical fiber to Simultaneous transmission of telephone, Internet, cable TV signals. Since different optical signals in the same optical fiber have different wavelengths, a wavelength division multiplexer (Wavelength Division Multiplexing, WDM) must be used to separate the different wavelengths.

Please refer to FIG. 1 , which is a structural diagram of a conventional optical fiber network signal access module disclosed in US Patent No. 5,629,995. As shown in Figure 1, the conventional optical fiber network signal access module 9 includes a first wavelength division multiplexer 91, a second wavelength division multiplexer 92, and amplifiers 93, 94, and the optical signal of wavelength λ1 is transmitted by the first The common port (Common Port) 911 of the wavelength division multiplexer 91 enters, because the filter element 914 of the wavelength division multiplexer A is designed to allow the optical signal of the wavelength λ1 to pass through, so the optical signal of the wavelength λ1 can pass through the filter element 914 And output by the transmission port (Pass Port) 913, after that, the optical signal of the wavelength λ1 passes through the amplifier 94 (to increase the signal strength to avoid signal attenuation) and enters by the common port 921 of the second wavelength division multiplexer 92, because the second wavelength division The filter element 924 of the multiplexer 92 is designed not to allow the optical signal of the wavelength λ1 to pass through, so the optical signal of the wavelength λ1 will be reflected by the filter element 924 to the reflection port (Reflect Port) 922 for output. On the contrary, the optical signal of wavelength λ2 enters through the reflection port 922 of the second wavelength division multiplexer 92 and passes through the filter element 924 (the filter element 924 is designed to allow the optical signal of wavelength λ2 to pass through) and is output by the transmission port 923, and then Through the amplifier 93 and then by the reverse of the first wavelength division multiplexer 91 The emission port 912 enters, and then is reflected by the filter element 914 to the output of the common port 911 (the filter element 914 is designed not to allow the optical signal of wavelength λ2 to pass through).

It can be seen from the above that because of the characteristics of the wavelength division multiplexer, that is, its filter element is designed to only allow optical signals of a certain wavelength to pass through, therefore, the application architecture shown in Figure 1 can only access (Add/Drop) ( That is, the so-called addition/extraction) of optical signals of different wavelengths, that is, only λ1 (λ2)/addition of λ2 (λ1) can be extracted, which cannot meet the requirements of today's optical fiber communication.

In order to solve the above-mentioned problem that the conventional optical fiber network signal access module can only receive signals of different wavelengths, this new model proposes a fiber optic network signal access module with a changed architecture design, which can receive the same and different signals. Optical fiber network signals with different wavelengths increase the flexibility of use.

According to the present invention, an optical fiber network signal access module capable of accessing the same and different wavelengths is provided, including a first wavelength division multiplexer, a second wavelength division multiplexer and a first optical circulator . Wherein, the first wavelength division multiplexer includes a first common port, a first reflection port, a first transmission port and a first filter element, and the first common port is based on the reflection effect of the first filter element And the signal is connected to the first reflection port, the first common port is connected to the first transmission port by the passing function of the first filter element; the second wavelength division multiplexer is connected to the first wavelength A wavelength division multiplexer, and the second wavelength division multiplexer includes a second common port, a second reflection port, a second transmission port and a second filter element, and the second common port is filtered by the second The signal is connected to the second reflection port by the reflection of the component, and the second common port is connected to the second transmission port by the passing function of the second filter element, wherein the light that can pass through the second filter element The wavelength of the signal is the same as or different from the wavelength of the optical signal that can pass through the first filter element; the first optical circulator includes three first communication ports, and one of the three first communication ports is connected to the One of the first transmission port and the second transmission port.

In the optical fiber network signal access module proposed by the above-mentioned new model that can access the same and different wavelengths, an optical circulator (Circulator) is added, and the so-called optical circulator is a kind of optical circulator with three (or four) ) optical device of the communication port, which can transmit the optical signal from one communication port to the next communication port in a certain direction, for example, when the optical signal with a certain wavelength enters the optical circulator from the first communication port, It will be output from the second communication port, and when the optical signal of a certain wavelength enters the optical circulator from the second communication port, it will be output from the third communication port, forming a channel from the first communication port to the second communication port. Two communication ports, the optical signal transmission path from the second communication port to the third communication port; in other words, when an optical signal of a certain wavelength is reflected, it will not return to the original communication port, but will be transmitted by another One communication port output, so the optical circulator can be used to separate the optical signal transmitted in the opposite direction in the optical fiber, so as to achieve the purpose of bidirectional transmission on a single optical fiber. Therefore, compared to the conventional optical fiber network signal access module which can only receive optical signals of different wavelengths, the new model can receive optical signals of the same and different wavelengths by using an optical circulator. It can improve the flexibility of use.

Optionally, in a non-limiting exemplary embodiment, the second reflection port of the second wavelength division multiplexer is connected to the first reflection port of the first wavelength division multiplexer.

Optionally, in a non-limiting exemplary embodiment, the second common port of the second wavelength division multiplexer is connected to the first reflection port of the first wavelength division multiplexer.

Optionally, in a non-limiting exemplary embodiment, one of the above-mentioned three first communication ports is connected to the first transmission port, and the other of the three first communication ports is connected to the second Transmission port.

Optionally, in a non-limiting exemplary embodiment, one of the three first communication ports of the above-mentioned first optical circulator is connected to the first transmission port; in addition, the same and different wavelengths can be accessed The optical fiber network signal access module further includes a second optical circulator, the second optical circulator includes three second communication ports, and one of the three second communication ports is connected to the second transmission port. The illustrated implementation aspects are generally applicable to peer-to-peer (P2P) networks.

In the above exemplary implementation, the optical fiber network signal access module capable of accessing the same and different wavelengths further includes a terminator, which is connected to the second reflection port. This prevents reflected signals from interfering with other nodes and receivers at the source host.

Optionally, in a non-limiting exemplary embodiment, the optical fiber network signal access module that can access the same and different wavelengths further includes a third wavelength division multiplexer, a fourth wavelength division A wavelength multiplexer and a second optical circulator, wherein the third wavelength division multiplexer is connected to the second wavelength division multiplexer, and the third wavelength division multiplexer includes a third common port and a third reflection Port, a third transmission port and a third filter element, the third common port is connected to the third reflection port by the reflection of the third filter element, and the third common port is connected by the passing function of the third filter element The signal is connected to the third transmission port; the fourth wavelength division multiplexer is connected to the third wavelength division multiplexer, and the fourth wavelength division multiplexer includes a fourth common port, a fourth reflection port, a fourth The transmission port and a fourth filter element, the fourth common port is connected to the fourth reflection port by the reflection effect of the fourth filter element, The fourth common port is connected to the fourth transmission port through the passing function of the fourth filter element, wherein the wavelength of the optical signal that can pass through the third filter element is the same as or different from the wavelength of the optical signal that can pass through the fourth filter element Same; the second optical circulator includes three second communication ports, one of the three second communication ports is connected to the third transmission port, and the other of the three second communication ports is connected to the fourth transmission port . The illustrated implementation aspect is generally applicable to a ring (Ring) network.

Optionally, in a non-limiting exemplary embodiment, the third common port of the above-mentioned third wavelength division multiplexer is connected to the second common port of the second wavelength division multiplexer, and the fourth wavelength The fourth reflection port of the wavelength division multiplexer is connected to the third reflection port of the third wavelength division multiplexer.

1,3,4: Optical fiber network signal access modules that can access the same and different wavelengths

11,41: The first wavelength division multiplexer

111,411: the first common port

112,412: the first reflection port

113,413: the first transmission port

114,414: first filter element

12,42: Second wavelength division multiplexer

121,421: the second common port

122,422: Second reflection port

123,423: the second transmission port

124,424: Second filter element

13: The third wavelength division multiplexer

131: The third common port

132: The third reflection port

133: The third transmission port

134: The third filter element

14: The fourth wavelength division multiplexer

141: The fourth common port

142: The fourth reflection port

143: The fourth transmission port

144: The fourth filter element

15,43: The first optical circulator

151,152,153,431,432,433: the first communication port

16,44: Second optical circulator

161,162,163,441,442,443: the second communication port

17: The third optical circulator

171: The third communication port

18: The fourth optical circulator

181: The fourth communication port

21,22,23,24,25,26: optical fiber

45:Terminator

9: Conventional optical fiber network signal access module

91: The first wavelength division multiplexer

92: second wavelength division multiplexer

911,921: common port

912,922: reflection port

913,923: Transmissive port

914,924: filter element

93:Amplifier

94: Amplifier

Fig. 1 is a structural diagram of a conventional optical fiber network signal access module.

Fig. 2 is a structural diagram of an optical fiber network signal access module capable of accessing the same and different wavelengths in the first preferred embodiment of the present invention.

Fig. 3 is a structural diagram of an optical fiber network signal access module capable of accessing the same and different wavelengths in the second preferred embodiment of the present invention.

Fig. 4 is a structural diagram of an optical fiber network signal access module capable of accessing the same and different wavelengths according to a third preferred embodiment of the present invention.

In conjunction with the accompanying drawings, the technical content of the present invention, its advantages and the effects it can achieve are further described in the form of preferred specific embodiments, but its purpose is only for illustration to facilitate a better understanding, not to Used for restrictions.

Please refer to FIG. 2 , which is a structural diagram of the first preferred embodiment of the present invention. In Fig. 2, the optical fiber network signal access module 1 that can access the same and different wavelengths is shown. In addition to using a wavelength division multiplexer, an optical circulator is used again. By virtue of the characteristics of the optical circulator (Please refer to the above), so that the optical fiber network signals of the same and different wavelengths can be accessed, which can improve the flexibility of use, and can also reduce the use of optical fibers and reduce wiring costs.

The optical fiber network signal access module 1 that can access the same and different wavelengths shown in Figure 2 includes a first wavelength division multiplexer 11, a second wavelength division multiplexer 12 and a first optical circulator 15 . Wherein, the first wavelength division multiplexer 11 and the second wavelength division multiplexer 12 have the same elements and functions. For example, the first wavelength division multiplexer 11 and the second wavelength division multiplexer 12 can be, for example, a coarse wavelength division multiplexer (Coarse Wavelength Division Multiplexing, CWDM), a dense wavelength division multiplexer (Dense Wavelength Division Multiplexing , DWDM), fine wavelength division multiplexer (Lan Wavelength Division Multiplexing, LWDM or LanWDM), medium wavelength wavelength division multiplexer (Metro Wavelength Division Multiplexing, MWDM) and coexistence wavelength division multiplexer (Coexistence Wavelength Division Multiplexing, CExWDM )wait.

Specifically, the first wavelength division multiplexer 11 includes a first common port 111, a first reflection port 112, a first transmission port 113 and a first filter element 114, wherein the first common port 111 is The signal of the first filter element 114 is connected to the first reflection port 112 by the reflection function of the first filter element 114 , and the signal of the first common port 111 is connected to the first transmission port 113 by the pass function of the first filter element 114 . The second wavelength division multiplexer 12 is connected to the first wavelength division multiplexer 11. Similarly, the second wavelength division multiplexer 12 includes a second common port 121, a second reflection port 122, a second transmission port Port 123 and a second filter element 124, the second common port 121 is connected to the second reflection port 122 by the reflection of the second filter element 124, and the second common port 121 is used by the passage of the second filter element 124 The signal is connected to the second transmission port 123 , and in this embodiment, the second reflection port 122 of the second wavelength division multiplexer 12 is connected to the first reflection port 112 of the first wavelength division multiplexer 11 . It will also be explained below that in the above structure, the wavelength of the optical signal that can pass through the second filter element 124 of the second wavelength division multiplexer 12 and the wavelength of the optical signal that can pass through the first filter element 114 of the first wavelength division multiplexer 11 The optical signals have the same wavelength.

The first optical circulator 15 shown in FIG. 2 also includes three first communication ports 151, 152, 153, and two of the three first communication ports 151, 152, 153 are connected to the first wavelength branch respectively. The first transmission port 113 of the wavelength multiplexer 11 and the second transmission port 123 of the second wavelength division multiplexer 12 . As mentioned above, the so-called optical circulator is an optical device with three (or four) communication ports, which can transmit optical signals from one communication port to the next communication port in a certain direction. In this embodiment, The three first communication ports 151, 152, and 153 are respectively defined as the first communication port 151 of sequence one, the first communication port 152 of sequence two, and the first communication port 153 of sequence three, wherein the first communication port 151 of sequence one The signal is connected to the first transmission port 113 , and the first communication port 153 in sequence three is connected to the second transmission port 123 . When an optical signal with a certain wavelength enters the first optical circulator 15 from the first communication port 152 of the second sequence, it will be output to the second transmission port of the second wavelength division multiplexer 12 through the first communication port 153 of the third sequence. port 123, and when an optical signal with a certain wavelength enters the first optical circulator 15 from the first communication port 151 of the sequence one, it will be output from the first communication port 152 of the sequence two to the next communication node (not shown in the figure) ).

The transmission process of optical signals of the same wavelength is described in detail below. As shown in Figure 2, the optical signals of different wavelengths λ1, λ2, λ3, λ4... carried by the optical fiber 21 enter the first wavelength division multiplexer 11 through the first common port 111 of the first wavelength division multiplexer 11 Afterwards, since the first filter element 114 of the first wavelength division multiplexer 11 (such as a filter, utilizes the difference in the reflectivity and transmittance of each wavelength to divide and solve the optical signals of different wavelengths) is designed to only allow wavelength The optical signal of λ1 passes through, and the optical signals of other wavelengths λ2, λ3, λ4, . . . cannot pass through the first filter element 114 and are reflected.

Therefore, the optical signal of wavelength λ1 passes through the first filter element 114 from the first common port 111 and is output from the first transmission port 113, is transmitted through the optical fiber 22, and enters the first optical circulator 15 through the first communication port 151 of the sequence one. , and then output from the first communication port 152 of the second sequence (that is, to pick up the optical signal of the Drop wavelength λ1), and the optical signals of the wavelength λ2, λ3, λ4... are filtered and reflected by the first filter element 114 and then transmitted by the first The reflection port 112 output enters the second wavelength division multiplexer 12 by the second reflection port 122 of the second wavelength division multiplexer 12 through the transmission of the optical fiber 23. Similarly, the second filter element 124 (such as a filter) is It is designed to only allow optical signals with wavelength λ1 to pass through. Therefore, optical signals with wavelengths λ2 , λ3 , λ4 .

Please refer to Fig. 2 again, the optical signal of wavelength λ1 enters the first optical circulator 15 from the first communication port 152 of the second sequence in the first optical circulator 15 through the single-core bidirectional optical fiber 24 (that is, adding the optical signal of Add wavelength λ1 ), the optical signal of wavelength λ1 will be output from the first communication port 153 of the sequence three, and enter the second wavelength division multiplexer 12 from the second transmission port 123 of the second wavelength division multiplexer 12 through the optical fiber 25, the wavelength The optical signal of λ1 passes through the second filter element 124 (as mentioned above, the second filter element 124 is designed to only allow the optical signal of wavelength λ1 to pass through), and the second common port 121 is output through the optical fiber 26 and includes the wavelength λ1, Optical signals of λ2, λ3, λ4.... Therefore, through the first optical circulator 15, the optical fiber network signal access module 1 can receive optical signals of the same wavelength.

Please refer to FIG. 3 , which is a structural diagram of a second preferred embodiment of the present invention. In the embodiment shown in Figure 3, the optical fiber network signal access module 3 that can access the same and different wavelengths includes the first wavelength division multiplexer 11 and the second wavelength division multiplexer shown in Figure 2 12 and the first optical circulator 15, also includes a third wavelength division multiplexer 13, a fourth wavelength division multiplexer 14 and a second optical circulator 16, and the third wavelength division multiplexer 13 The elements and functions of the fourth wavelength division multiplexer 14 and the second optical circulator 16 are the same as those of the first wavelength division multiplexer 11 , the second wavelength division multiplexer 12 and the first optical circulator 15 .

Specifically, the third wavelength division multiplexer 13 is connected to the second wavelength division multiplexer 12, and the third wavelength division multiplexer 13 includes a third common port 131, a third reflection port 132, a first Three transmission ports 133 and a third filter element 134, wherein the third common port 131 is connected to the third reflection port 132 by the reflection of the third filter element 134, and the third common port 131 is connected by the third filter element The passing function of 134 is connected to the third transmission port 133; the fourth wavelength division multiplexer 14 is connected to the third wavelength division multiplexer 13, and similarly, the fourth wavelength division multiplexer 14 includes a fourth wavelength division multiplexer 14 Common port 141, a fourth reflection port 142, a fourth transmission port 143 and a fourth filter element 144, the fourth common port 141 is connected to the fourth reflection port 142 by the reflection of the fourth filter element 144, The fourth common port 141 is connected to the fourth transmission port 143 by the passage of the fourth filter element 144; the second optical circulator 16 includes three second communication ports 161, 162, 163, and the three second communication ports One of the ports 161, 162, 163 is connected to the third transmission port 133 of the third wavelength division multiplexer 13, and the other of the three second communication ports 161, 162, 163 is connected to the fourth transmission port 143. As in the first embodiment above, the first communication port 151 of the first optical circulator 15 is connected to the first transmission port 113 of the first wavelength division multiplexer 11, and the first communication port 153 of the third order is connected In the second transmission port 123 of the second wavelength division multiplexer 12 . The second communication port 161 of the sequence one of the second optical circulator 16 is connected to the third transmission port 133 of the third wavelength division multiplexer 13, and the second communication port 162 of the sequence three is connected to the fourth wavelength division multiplexer. The fourth transmission port 143 of device 14

In this embodiment, the third common port 131 of the third wavelength division multiplexer 13 is connected to the second common port 121 of the second wavelength division multiplexer 12, and the fourth reflection of the fourth wavelength division multiplexer 14 The port 142 is connected to the third reflection port 132 of the third wavelength division multiplexer 13 . The wavelength of the optical signal that can pass through the third filter element 134 of the third wavelength demultiplexer 13 is the same as the wavelength of the optical signal that can pass through the fourth filter element 144 of the fourth wavelength demultiplexer 14, but can pass through the first The wavelength of the optical signal of the first filter element 114 of the wavelength division multiplexer 11 and the second filter element 124 of the second wavelength division multiplexer 12 and the third filter element 134 that can pass through the third wavelength division multiplexer 13 The wavelength of the optical signal is different from that of the fourth filter element 144 of the fourth wavelength division multiplexer 14 .

As shown in Figure 3, the first wavelength division multiplexer 11, the second wavelength division multiplexer 12 and the first optical circulator 15 can be used to receive the optical signal of wavelength λ1, the third wavelength division multiplexer 13, The fourth wavelength division multiplexer 14 and the second optical circulator 16 can be used to receive the optical signal of the wavelength λ2 (the third filter element 134 and the fourth filter element 144 are designed to only allow the optical signal of the wavelength λ2 to pass through) ; That is, the second common port 121 output by the second wavelength division multiplexer 12 includes wavelengths λ1, λ2, λ 3. The optical signal of λ4... enters the third wavelength division multiplexer 13 from the third common port 131 of the third wavelength division multiplexer 13, and then the optical signal of wavelength λ2 passes through the third filter through the third common port 131 The component 134 is output from the third transmission port 133 to the second communication port 161 of the sequence one to enter the second optical circulator 16, and then output through the second communication port 162 of the sequence two (that is, to capture the optical signal of the drop wavelength λ2) , and the optical signals of wavelengths λ1, λ3, λ4... are filtered and reflected by the third filter element 134, and then output to the fourth wavelength demultiplexer 14 from the third reflection port 132. Similarly, the fourth filter element 144 (such as filter) is designed to only allow optical signals with wavelength λ2 to pass through, therefore, optical signals with wavelengths λ1, λ3, λ4, .

The optical signal of wavelength λ2 enters the second optical circulator 16 from the second communication port 162 of the second order in the second optical circulator 16 (that is, adding the optical signal of Add wavelength λ2), and the optical signal of wavelength λ2 will pass through the third communication port 162 of the third order. The second communication port 163 is output to the fourth transmission port 143 of the fourth wavelength division multiplexer 14 and enters the fourth wavelength division multiplexer 14, and the optical signal of wavelength λ2 passes through the fourth filter element 144 again, and passes through the fourth common port 141 outputs optical signals including wavelengths λ1, λ2, λ3, λ4.... Therefore, through the first optical circulator 15 and the second optical circulator 16 , the optical fiber network signal access module 3 can receive optical signals of the same and different wavelengths.

Referring to FIG. 3 again, a third optical circulator 17 and a third optical circulator 17 can be respectively set at a specific distance away from the first optical circulator 15 and the second optical circulator 16 (such as a user end at 1 km to 2 km). A fourth optical circulator 18, the third optical circulator 17 and the fourth optical circulator 18 are used for separating optical signals, that is, the single signal transmitted through the corresponding first optical circulator 15 and second optical circulator 16 The bidirectional optical signal can be separated by the third optical circulator 17 and the fourth optical circulator 18 to allow the optical transceiver to transmit and receive signals.

The third communication port 171 of the third optical circulator 17 is connected to the first communication port 152 of the second order in the first optical circulator 15, and the optical signal of wavelength λ1 is output from the first optical circulator 15 to the third optical circulator 17, and the third optical circulator also outputs an optical signal of wavelength λ1 to the first optical circulator 15; the fourth communication port 181 of the fourth optical circulator 18 is connected to the second port of the sequence two in the second optical circulator 16. The communication port 162 outputs the optical signal of wavelength λ2 from the second optical circulator 16 to the fourth optical circulator 18 , and the fourth optical circulator 18 also outputs the optical signal of wavelength λ2 to the second optical circulator 16 . In this way, optical signals of the same wavelength can be bidirectionally transmitted forward (Forward) through the first optical circulator 15 or the second optical circulator 16, and optical signals of different wavelengths can be transmitted through the integration of the first optical circulator 15 and the second optical circulator. The circulator 16 transmits forward (Forward) bidirectionally, so that the received optical signal is bidirectionally transmitted in the single-core optical fiber, which can reduce the usage of optical fiber and reduce the layout of optical fiber. line cost. Generally speaking, the forward transmission signal is usually applied to the ring (Ring) network (transmission signal from one client to another until all the clients are connected into a ring).

Please refer to FIG. 4 , which is a structure diagram of a third preferred embodiment of the present invention. In the embodiment shown in Figure 4, the optical fiber network signal access module 4 that can access the same and different wavelengths includes a first wavelength division multiplexer 41, a second wavelength division multiplexer 42, a The first optical circulator 43 and a second optical circulator 44, and the first optical circulator 43 and the second optical circulator 44 can be separated from the first wavelength division multiplexer 41 and the second wavelength division multiplexer 42 respectively They are set at a certain distance apart, for example, 1 km to 2 km.

Specifically, the first wavelength division multiplexer 41 includes a first common port 411, a first reflection port 412, a first transmission port 413 and a first filter element 414, wherein the first common port 411 is The signal of the first filter element 414 is connected to the first reflection port 412 by the reflection function of the first filter element 414 , and the signal of the first common port 411 is connected to the first transmission port 413 by the pass function of the first filter element 414 . Similarly, the second wavelength division multiplexer 42 includes a second common port 421, a second reflection port 422, a second transmission port 423 and a second filter element 424, and the second common port 421 is filtered by the second The signal is connected to the second reflection port 422 by the reflection of the element 424, and the second common port 421 is connected to the second transmission port 423 by the passing function of the second filter element 424, wherein the light that can pass through the second filter element 424 The signal wavelength is different from the optical signal wavelength that can pass through the first filter element 414 , and the second wavelength multiplexer 42 is connected to the first reflective port 412 of the first wavelength multiplexer 11 through the second common port 421 .

Referring to FIG. 4 again, the first optical circulator 43 includes three first communication ports 431, 432, 433, and these three first communication ports 431, 432, 433 are respectively defined as the first communication ports 431, 431, 433 of the sequence one. The first communication port 432 of the second sequence and the first communication port 433 of the third sequence, the first communication port 432 of the second sequence is connected to the first transmission port 413 of the first wavelength division multiplexer 41; the second optical circulator 44 Including three second communication ports 441, 442, 443, and these three second communication ports 441, 442, 443 are respectively defined as the second communication port 441 of the first sequence, the second communication port 442 of the second sequence and the second communication port of the third sequence The second communication port 443 and the second communication port 442 in the second sequence are connected to the second transmission port 423 of the second wavelength division multiplexer 42 . The transmission process of optical signals with different wavelengths is described in detail below.

As shown in Figure 4, after the optical signals of different wavelengths λ1, λ2, λ3, λ4... enter the first wavelength division multiplexer 41 through the first common port 411 of the first wavelength division multiplexer 41, due to the first The first filter element 414 of the wavelength division multiplexer 41 is designed to only allow the optical signal of the wavelength λ1 to pass through, and the optical signal of the wavelength λ1 passes through the first filter element 414 from the first common port 411 and is output by the first transmission port 413 , and pass through the first optical circulator 43 through the first communication port 432 of the second sequence (that is, to capture the drop wavelength λ1 optical signal), and then transmitted to the next communication node (not shown) by the first communication port 433 of the third sequence in the first optical circulator 43. The optical signals of other wavelengths λ2, λ3, λ4... cannot pass through the first filter The component 414 is reflected and output from the first reflection port 412 , and enters the second wavelength division multiplexer 42 through the second common port 421 of the second wavelength division multiplexer 42 . Similarly, the second filter element 424 is designed to only allow the optical signal of the wavelength λ2 to pass through, and the optical signal of the wavelength λ2 passes through the second filter element 424 from the second common port 421 and is output by the second transmission port 423, and is sequentially The second communication port 442 of the second pass through the second optical circulator 44 (i.e. captures the optical signal of Drop wavelength λ2), and then transmits to the next communication node ( not shown), the optical signals of other wavelengths λ3, λ4, . The optical signal transmission direction in this embodiment is defined as backward (Backward) bidirectional transmission.

Please refer to Fig. 4 again, the optical signal of wavelength λ1 is passed through the first optical circulator 43 by the first communication port 431 of the sequence one in the first optical circulator 43, and then by the first communication port 431 of the sequence two in the first optical circulator 43 The port 432 enters the first transmission port 413 of the first wavelength division multiplexer 41 (i.e. adding the optical signal of the Add wavelength λ1), and the optical signal of the wavelength λ1 passes through the first filter element 414 (as mentioned above, the first filter element 414 It is designed to allow only optical signals with wavelength λ1 to pass through), and the first common port 411 outputs optical signals including wavelengths λ1, λ2, λ3, λ4 . . . Similarly, the optical signal of wavelength λ2 enters the second optical circulator 44 from the second communication port 441 of the first order in the second optical circulator 44, and then enters the second communication port 442 of the second order in the second optical circulator 44. The second transmission port 423 of the second wavelength division multiplexer 42 (i.e. adding the optical signal of Add wavelength λ2), the optical signal of wavelength λ2 passes through the second filter element 424 (as mentioned above, the second filter element 424 is designed as Only optical signals with wavelength λ2 can pass through), and the second common port 421 outputs optical signals including wavelengths λ2, λ3, λ4 . . .

In the embodiment shown in Figure 4, the connection mode of the first wavelength division multiplexer 41 and the second wavelength division multiplexer 42 is opposite to that of the first wavelength division multiplexer 11 and the first wavelength division multiplexer 11 shown in Figure 2 and Figure 3 The connection mode of the second wavelength division multiplexer 12, and the first wavelength division multiplexer 41 shown in FIG. The first wavelength division multiplexer 11 shown in FIG. 2 and FIG. 3 is connected to the second reflection port 122 of the second wavelength division multiplexer 12 through the first reflection port 112 .

When transmitting bidirectional signals at the same wavelength backwards, part of the optical circulator can be omitted and the optical circulator at the transceiver end can be directly used (a specific distance from the first wavelength division multiplexer 41 and the second wavelength division multiplexer 42 respectively). The first optical circulator 43 and the second optical circulator 44) are separated and accessed Signals are transmitted bi-directionally in a single core fiber. Backward signaling is usually used in peer-to-peer (P2P) networks (each client is both a node and a server, and any node cannot directly find other nodes).

Also shown in FIG. 4 , the optical fiber network signal access module 4 of this embodiment can further include a terminator (Terminator) 45, and this terminator 45 is signal-connected to the second wavelength division multiplexer 42. reflection port 422. The terminator 45 can be, for example, an optical attenuator (Attenuator) or an angled lead (APC Pigtail) to prevent reflected signals from interfering with other nodes and the receiver at the source host end.

It can be seen from the above preferred embodiments that the structure of the optical fiber network signal access module proposed by the present invention can access the same and different wavelengths, so it has great flexibility in use, for example, it can be used according to different customers. According to the requirements (such as fiber optic wiring area, transmission capacity, network architecture type, etc.), it can be designed in a customized way, and can reduce the use of optical fibers and reduce wiring costs.

The above descriptions are only preferred specific embodiments of the present invention, and they are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

1: Fiber optic network signal access module that can access the same and different wavelengths

11: The first wavelength division multiplexer

111: the first common port

112: The first reflection port

113: The first transmission port

114: the first filter element

12: The second wavelength division multiplexer

121: Second common port

122: Second reflection port

123: Second transmission port

124: the second filter element

15: The first optical circulator

151,152,153: the first communication port

21,22,23,24,25,26: optical fiber

Claims (8)

An optical fiber network signal access module capable of accessing the same and different wavelengths, including: A first wavelength division multiplexer, including a first common port, a first reflection port, a first transmission port and a first filter element, the first common port is formed by the reflection of the first filter element The signal is connected to the first reflection port, and the first common port is connected to the first transmission port by the passing function of the first filter element; A second wavelength division multiplexer is connected to the first wavelength division multiplexer, and the second wavelength division multiplexer includes a second common port, a second reflection port, a second transmission port and a The second filter element, the second common port is connected to the second reflection port by the reflection function of the second filter element, and the second common port is connected to the signal by the pass function of the second filter element. a second transmission port, wherein the wavelength of the optical signal that can pass through the second filter element is the same as or different from the wavelength of the optical signal that can pass through the first filter element; and A first optical circulator includes three first communication ports, one of the three first communication ports is connected to one of the first transmission port and the second transmission port. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 1, wherein the second reflection port of the second wavelength division multiplexer is connected to the first wavelength division multiplexer The first reflection port of the device. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 1, wherein the second common port of the second wavelength division multiplexer is connected to the first wavelength division multiplexer The first reflection port of the device. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 1, wherein one of the three first communication ports is connected to the first transmission port, and the three third communication ports are connected to the first transmission port. The other of one communication port is connected to the second transmission port. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 1, wherein one of the three first communication ports of the first optical circulator is connected to the first The transmission port; the optical fiber network signal access module that can access the same and different wavelengths further includes a second optical circulator, and the second optical circulator includes three second communication ports, and the three second communication ports One of the ports is connected to the second transmission port. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 5, further comprising a terminator connected to the second reflection port. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 1 further includes: A third wavelength division multiplexer is connected to the second wavelength division multiplexer, and the third wavelength division multiplexer includes a third common port, a third reflection port, a third transmission port and a The third filter element, the third common port is connected to the third reflection port by the reflection function of the third filter element, and the signal is connected to the third common port by the pass function of the third filter element. the third transmission port; A fourth wavelength division multiplexer is connected to the third wavelength division multiplexer, and the fourth wavelength division multiplexer includes a fourth common port, a fourth reflection port, a fourth transmission port and a The fourth filter element, the fourth common port is connected to the fourth reflection port by the reflection function of the fourth filter element, and the fourth common port is connected to the signal by the passing function of the fourth filter element. A fourth transmission port, wherein the wavelength of the optical signal that can pass through the third filter element is the same as or different from the wavelength of the optical signal that can pass through the fourth filter element; and A second optical circulator, including three second communication ports, one of the three second communication ports is connected to the third transmission port, and the other of the three second communication ports is connected to the The fourth transmission port. The optical fiber network signal access module capable of accessing the same and different wavelengths as described in claim 7, wherein the third common port of the third wavelength division multiplexer is connected to the second wavelength division multiplexer The second common port of the device, and the fourth reflection port of the fourth wavelength division multiplexer is connected to the third reflection port of the third wavelength division multiplexer.

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