TWI497928B - Passive optical network system - Google Patents

Description

Passive optical network system

The present invention relates to a network system, and more particularly to a passive optical network system.

As the number of Internet users increases, so does the amount of data transfer. The traditional technology of using electrical signals for communication, because of the bandwidth limitation of electrical signals, will cause congestion in the network. As a result, many Internet service providers use fiber-optic communications to provide network services to a variety of Internet users with different needs.

Figure 1, Figure 2 and Figure 3 are time-division multiplex passive optical network (TDM-PON), split-multiplexed passive optical network (WDM-PON), split-wave multiplexing and time-multiplexed passive light The basic architecture of the network (WDM-TDM-PON). TDM-PON is a network that transmits time and time, allowing OLT (optical line termination) 10 to transmit data to different users at different times. The remote node (RN) distributes the data to each user through a Power Splitter 12. In the WDM-PON architecture, different users and the OLT 14 transmit data through different wavelengths, and the remote node (RN) uses an Arrayed Waveguide (AWG) 16 to distribute the optical signals of different wavelengths. Different users. Since the amount of data that can be carried by a single wavelength is very large, the transmission speed of each optical network unit (ONU) 18 can be effectively increased in the WDM-PON architecture. WDM-TDM-PON is proposed for more efficient integration and utilization of optical networks for situations where there may be less speed or cost sharing required by ONUs. WDM-TDM-PON is as its name suggests A hybrid architecture of two optical networks, WDM-PON and TDM-PON. WDM-TDM-PON captures the characteristics of both TDM-PON and WDM-PON architectures. An optical coupler 22 is added to the WDM-PON array grating 20 to transmit the optical signal to broadcast ( The broadcast method is transmitted to all users of the same wavelength, and different users receive or upload data according to the usage period to which they are assigned.

Since pure TDM technology has gradually failed to meet the high-speed needs of users, in reality, if the entire architecture is to be converted from TDM-PON to WDM-PON, the cost of the entire network renovation will be very expensive, so the time of Figure 4 is proposed. A multiplexed passive optical network (TWDM-PON) in which a light end 24 and a plurality of optical network units 26 transmit a plurality of different wavelength signals λ ₁ ... λ ₈ , which is improved compared to WDM-TDM-PON. transfer speed. However, TWDM-PON does not meet the network bandwidth requirements in the future due to network scalability and number of shunts.

Accordingly, the present invention has been made in view of the above problems, and a passive optical network system is proposed to solve the problems caused by the prior art.

The main purpose of the present invention is to provide a passive optical network system, which is a new split-wave multiplexing passive optical network (WDM-PON) after the first signal receiving end, to improve the split ratio and the transmission speed. The amount of data transmission, without changing the network architecture of the front end, can be used as an extended network of time division multiplexed passive optical network (TWDM-PON) or a split-multiplexed and time-multiplexed passive optical network (WDM-TDM- PON) is an intermediary medium with low cost and high economic efficiency.

To achieve the above objective, the present invention provides a passive optical network system including a plurality of signal providing terminals respectively generating a first optical signal carrying one of the following transmission signals, and all of the first optical signals have different wavelengths. The signal providing end sequentially connects a first optical filter and a splitter to thereby output the first optical signal. The optical splitter is connected to the plurality of first signal receiving ends, and the corresponding ones are respectively corresponding The signal receiving end receives the first optical signal from each of the first signal receiving ends, and captures the first optical signal generated by the corresponding signal providing end carrying the downlink signal, and outputs the remaining first optical signals. The first signal receiving end sequentially connects a second optical filter and a third optical filter, and the third optical filter receives the outputted first optical signal through the second optical filter, and outputs a plurality of different wavelengths according to the first optical filter. Second optical signal. The third optical filter is connected to the plurality of third optical couplers, and each of the third optical couplers is connected to the plurality of second signal receiving ends, and each of the second optical signals is respectively received for transmission to the corresponding second signal receiving end.

For a better understanding and understanding of the structural features and the achievable effects of the present invention, please refer to the preferred embodiment and the detailed description.

10‧‧‧Light end

12‧‧‧ Spectroscope

14‧‧‧Light end

16‧‧‧Array grating

18‧‧‧ Optical Network Unit

20‧‧‧Array grating

22‧‧‧Optocoupler

24‧‧‧Light end

26‧‧‧Optical network unit

28‧‧‧ Signal provider

30‧‧‧First optical filter

32‧‧‧Amplifier

33‧‧‧Amplifier

34‧‧‧Abeam splitter

36‧‧‧First signal receiver

38‧‧‧Second optical filter

40‧‧‧ Third optical filter

42‧‧‧The third optocoupler

44‧‧‧second signal receiver

46‧‧‧First optical signal generator

48‧‧‧First photoelectric transducer

50‧‧‧Second optical signal generator

52‧‧‧First optical circulator

54‧‧‧First light receiver

56‧‧‧Second optical circulator

58‧‧‧Second light receiver

60‧‧‧First optical modulation unit

62‧‧‧Second light modulation unit

64‧‧‧The third optical circulator

66‧‧‧Second photoelectric transducer

68‧‧‧First Optocoupler

70‧‧‧ Third optical modulation unit

72‧‧‧fourth optical circulator

74‧‧‧First fiber Bragg grating

76‧‧‧The fifth optical circulator

78‧‧‧Second fiber Bragg grating

80‧‧‧ sixth optical circulator

82‧‧‧ third fiber Bragg grating

84‧‧‧First optical signal generator

86‧‧‧First photoelectric transducer

88‧‧‧First optical circulator

90‧‧‧First light receiver

92‧‧‧Second optical circulator

94‧‧‧First optical modulation unit

96‧‧‧First Optocoupler

98‧‧‧Second light receiver

100‧‧‧ Third optical circulator

102‧‧‧Second photoelectric transducer

104‧‧‧Second optocoupler

106‧‧‧Second light modulation unit

108‧‧‧fourth optical circulator

110‧‧‧First fiber Bragg grating

112‧‧‧The fifth optical circulator

114‧‧‧Second fiber Bragg grating

116‧‧‧First optical signal generator

118‧‧‧First photoelectric transducer

120‧‧‧First light receiver

122‧‧‧First optical circulator

124‧‧‧First optical modulation unit

126‧‧‧Second light receiver

128‧‧‧Second optical signal generator

130‧‧‧Second photoelectric transducer

132‧‧‧First Optocoupler

134‧‧‧Second light modulation unit

136‧‧‧Second optical circulator

138‧‧‧First fiber Bragg grating

140‧‧‧The third optical circulator

142‧‧‧Second fiber Bragg grating

144‧‧ ‧ laser generator

146‧‧‧Mcson Modulator

147‧‧‧Light Circulator

148‧‧‧Light Circulator

149‧‧Amplifier

150‧‧‧Attenuator

152‧‧‧First fiber Bragg grating

154‧‧‧Second fiber Bragg grating

156‧‧‧Light Circulator

157‧‧‧Attenuator

158‧‧‧Photodetector

160‧‧‧Laser Generator

162‧‧‧Light Circulator

163‧‧‧Light Circulator

164‧‧Amplifier

166‧‧‧Attenuator

168‧‧‧First fiber Bragg grating

169‧‧‧Light Circulator

170‧‧‧Second fiber Bragg grating

172‧‧‧Light Circulator

174‧‧‧Reflective semiconductor optical amplifier

176‧‧‧Attenuator

177‧‧‧Amplifier

178‧‧‧ Dimmable filter

179‧‧‧ attenuator

180‧‧‧Photodetector

Figure 1 is a schematic diagram of a prior art time division multiplex passive optical network (TDM-PON).

Figure 2 is a schematic diagram of a prior art split-wave multiplexing passive optical network (WDM-PON).

Figure 3 is a schematic diagram of a prior art split-wave multiplexing and time division multiplex passive optical network (WDM-TDM-PON).

Figure 4 is a schematic diagram of a prior art time division multiplexed passive optical network (TWDM-PON).

Figure 5 is a schematic diagram of a network system in accordance with a first embodiment of the present invention.

Figure 6 is a schematic diagram of a network system of a second embodiment of the present invention.

Figure 7 is a schematic diagram of a network system of a third embodiment of the present invention.

Figure 8 is a schematic diagram of a network system of a fourth embodiment of the present invention.

Figure 9 is a schematic diagram of a network system of a fifth embodiment of the present invention.

Figure 10 is a schematic diagram of a network system of a sixth embodiment of the present invention.

Figure 11 (a) and Figure 11 (b) are schematic diagrams of the architecture of the transmission and uploading experiments of the present invention.

Figure 12(a) is a diagram showing the bit error rate distribution of the transmission number under the present invention.

Figure 12(b) is a diagram showing the error rate distribution of the uploaded signal of the present invention.

The first embodiment will be described first, see Fig. 5. The present invention includes a plurality of signal providing terminals 28 respectively generating a first optical signal S ₁ and a third optical signal S ₃ carrying a lower transmission signal S _d , all of the first optical signal S ₁ and the third optical signal S The wavelengths of ₃ are all different. The signal providing terminal 28 is connected to a first optical filter 30, which receives all the first optical signals S ₁ and all the third optical signals S ₃ and outputs them. The first optical filter 30 is connected to a splitter 34 through the two amplifiers 32 and 33. The first optical signal S ₁ and all the third optical signals S _{3 are} received by the amplifier 32 and output. The splitter 34 is connected to the plurality of first signal receiving ends 36, which respectively correspond to the signal providing end 28, and each of the first signal receiving ends 36 receives all the first optical signals S ₁ and all the third optical signals S ₃ and correspondingly The first optical signal S ₁ and the third optical signal S ₃ , which are generated by the signal receiving terminal 28 and carrying the downlink signal S _d , output the remaining first optical signal S ₁ and the remaining third optical signal S ₃ . The first signal receiving end 36 is connected to a second optical filter 38 for receiving the first optical signal S ₁ and the third optical signal S ₃ from the first signal receiving end 36 and outputting the same. The second optical filter 38 is connected to a third optical filter 40, which receives the first optical signal S ₁ and the third optical signal S ₃ from the second optical filter 38, and outputs a plurality of second lights of different wavelengths according to the second optical filter 38. Signal S ₂ . The third optical filter 40 is connected to the plurality of third optical couplers 42, and each of the third optical couplers 42 is connected to the plurality of second signal receiving ends 44, and receives each second optical signal S ₂ for transmission to the corresponding The second signal receiving end 44. The first optical filter 30, the second optical filter 38, and the third optical filter 40 are all exemplified by an arrayed waveguide grating. Each of the second signal receiving ends 44 can also sequentially pass through the third optical coupler 42, the third optical filter 40, the second optical filter 38, the first signal receiving end 36, the optical splitter 34, the amplifier 33, and the first The optical filter 30 transmits a fourth optical signal S ₄ to the signal supply terminal 28.

Each signal providing end 28 further includes a first optical signal generator 46 that generates a first optical signal S ₁ . The first optical signal generator 46 is coupled to the first optical filter 30 to a first photo-modulator 48, such as a Mach-Zehnder modulator, a reflective semiconductor optical amplifier (RSOA), and an electro-absorption modulator ( EAM (electro-absorption modulator) or Fabry-Perot laser diode (FP-LD), which receives the first optical signal S ₁ and the downlink signal S _d to be modulated The first optical signal S ₁ carries a downlink signal S _d and is transmitted to the first optical filter 30. Another second optical signal generator 50 generates a third optical signal S ₃ . The second optical signal generator 50 is connected to a first optical circulator 52, which receives the third optical signal S ₃ and transmits it to the first optical filter 30, the amplifier 32 and the optical splitter 34 to all the first signal receiving. The first signal receiving end 36 captures the corresponding third optical signal S ₃ to carry the upload signal S _u and transmits the third optical signal S ₃ carrying the upload signal S _{u to} the optical splitter. 34. The amplifier 33 and the first optical filter 30 are returned to the corresponding first optical circulator 52. A first optical circulator 52 is connected to a first light receiver 54, such as an optical detector (PD) or the optical spectrum analyzer (the OSA), which is based from the first optical circulator 52 with a third reception carrier signal S _u of upload Optical signal S ₃ .

Each of the first signal receiving ends 36 further includes a second optical circulator 56 that is connected to the optical splitter 34 and receives all of the first optical signals S ₁ and all of the third optical signals S ₃ for output. The second optical circulator 56 and the second optical receiver 58 are connected to a first optical modulation unit 60, which receives all the first optical signals S ₁ and all the third optical signals S ₃ , and transmits the corresponding signals. Transmitting the first optical signal S _{1 of the} signal S _d to the second optical receiver 58 and outputting the remaining first optical signal S ₁ and all the third optical signals S ₃ , wherein the second optical receiver 58 can be implemented by PD or OSA . The first optical modulation unit 60 is connected to a third optical circulator 64 via a second optical modulating unit 62. The second optical modulating unit 62 receives the first optical signal S ₁ and the first output of the first optical modulating unit 60. Sanko signal S _3, and the corresponding signal S ₃ of the third light transmitted to the third optical circulator 64, and the remaining output of the first optical signal S ₁ and the rest of the third optical signal S _3. The third optical circulator 64 is coupled to a second photo modulator 66, such as a Mach-Zehnder modulator, a reflective semiconductor optical amplifier, an electro-absorption modulator or an FP-LD, which receives the first optical circulator 64. The third optical signal S ₃ receives the upload signal S _u , the third optical circulator 64 is connected to the second optical circulator 56 through a first optical coupler 68 , and the second optical modulator 66 modulates the third optical signal S _{3 .} The upload signal S _{u is carried} and is output to the beam splitter 34 through the third optical circulator 64 , the first optical coupler 68 and the second optical circulator 56 in sequence. In addition, the second optical modulation unit 62 is coupled to a third optical modulation unit 70 that is coupled to the second optical circulator 56 through the first optical coupler 68. The third optical modulation unit 70 receives the remaining first optical signal S ₁ and the remaining third optical signal S ₃ output by the second optical modulation unit 62, and selects at least one of them as a recognized optical signal, and the rest is used as a complex application. The optical signal, the third optical modulation unit 70 sequentially transmits the identification optical signal through the first optical coupler 68, the second optical circulator 56, the optical splitter 34, the first optical filter 30, and the first optical circulator 52. Returning to the first optical receiver 54, the application optical signal is simultaneously outputted to the second optical filter 38. Since the first optical receiver 54 can be a PD, the PD can determine whether the downstream first signal receiving end 36 is still connected to the entire network according to whether the identification optical signal is received. When the first optical receiver 54 is an OSA, the OSA determines whether the downstream first signal receiving terminal 36 is still connected to the entire network according to the spectrum. If the specific identification optical signal is not received by the signal providing terminal 28, the signal providing end can guess that the specific first signal receiving end 36 is faulty, so that the identification optical signal cannot be returned. If most of the identification optical signals are not transmitted back to the first signal receiving end 36, it can be guessed that the optical distribution network (ODN) of the network may be malfunctioning.

The first optical modulation unit 60 further includes a fourth optical circulator 72 and a first fiber Bragg grating 74. The fourth optical circulator 72 is connected to the second optical circulator 56 and the second optical receiver 58 to receive all the first optical signals S ₁ and all the third optical signals S ₃ and output them. The first fiber Bragg grating 74 is coupled to the fourth optical circulator 72 to receive all of the first optical signal S ₁ and all of the third optical signals S ₃ . Since the fiber Bragg grating itself has a structure that bounces back to a specific wavelength, the first fiber Bragg grating 74 transmits the corresponding first optical signal S ₁ to the second optical receiver 58 through the fourth optical circulator 72, and the rest The first optical signal S _{1 is} output with all of the third optical signals S ₃ . The second optical modulation unit 62 further includes a fifth optical circulator 76 and a second fiber Bragg grating 78. The fifth optical circulator 76 is connected to the first fiber Bragg grating 74 and the third optical circulator 64 to receive the first optical signal S ₁ and the third optical signal S ₃ output by the first fiber Bragg grating 74 and output the same. The second fiber Bragg grating 78 is connected to the fifth optical circulator 76 to receive the first optical signal S ₁ and the third optical signal S ₃ , and transmits the corresponding third optical signal S _{3 to the} fifth optical circulator 76 . The three-light circulator 64 outputs the remaining first optical signal S ₁ and the remaining third optical signal S ₃ . The third optical modulation unit 70 further includes a sixth optical circulator 80 and a third fiber Bragg grating 82. The sixth optical circulator 80 is connected to the second fiber Bragg grating 78 and the first optical coupler 68 to receive the first optical signal S ₁ and the third optical signal S ₃ output by the second fiber Bragg grating 78 and output the same. The third fiber Bragg grating 82 is connected to the sixth optical circulator 80 to receive the first optical signal S ₁ and the third optical signal S ₃ , and transmits the identification optical signal to the first optical coupler 38 through the sixth optical circulator 80 . The optical signal output will be applied again.

The signal transmission process of the first embodiment will be described below. First, the first optical signal generator 46 and the second optical signal generator 50 of each signal providing terminal 28 respectively generate a first optical signal S ₁ and a third optical signal S ₃ . The first photo-modulator 48 receives the first optical signal S ₁ and transmits the first optical signal S _d , and then sequentially transmits the first optical filter 30 , the amplifier 32 and the optical splitter 34 together with the third optical signal S ₃ . And passed to all the first signal receiving ends 36. Then, the second optical circulator 56 receives all the first optical signals S ₁ and all the third optical signals S ₃ and transmits them to the first fiber Bragg grating 74 through the fourth optical circulator 72 . The first fiber Bragg grating 74 transmits the corresponding first optical signal S ₁ to the second optical receiver 58 through the fourth optical circulator 72, and outputs the remaining first optical signal S ₁ through the fifth optical circulator 76. All third optical signals S ₃ to second fiber Bragg gratings 78. The second fiber Bragg grating 78 then transmits the corresponding third optical signal S ₃ through the fifth optical circulator 76 and the third optical circulator 64 to the second photo modulator 66 while the remaining first light is The signal S ₁ and the remaining third optical signal S ₃ are output to the third fiber Bragg grating 82 through the sixth optical circulator 80. The second photo-electric modulator 66 carries the third optical signal S ₃ on the upload signal S _u , and sequentially passes through the third optical circulator 64 , the first optical coupler 68 , the second optical circulator 56 , the optical splitter 34 , and the amplifier . 33. The first optical filter 30 and the corresponding first optical circulator 52 are transmitted to the corresponding first optical receiver 54. At the same time, the third fiber Bragg grating 82 selects at least one of the first optical signal S ₁ and the third optical signal S ₃ as the identification optical signal, and the other applies the optical signal as a plurality. The third fiber Bragg grating 82 sequentially passes through the sixth optical circulator 80, the first optical coupler 68, the second optical circulator 56, the optical splitter 34, the amplifier 33, the first optical filter 30, and the corresponding first optical cycle. The device 52 transmits the identification optical signal back to the corresponding first optical receiver 54 and outputs the applied optical signal to the second optical filter 38. The third optical filter 40 receives the applied optical signal from the second optical filter 38 and outputs a plurality of second optical signals S _{2 of} different wavelengths accordingly. Each of the third optical couplers 42 receives each of the second optical signals S ₂ for transmission to the corresponding second signal receiving end 44. In addition, each of the second signal receiving ends 44 can also sequentially transmit through the third optical coupler 42, the third optical filter 40, the second optical filter 38, the corresponding first signal receiving end 36, the optical splitter 34, and the amplifier. 33 and the first optical filter 30 transmit the fourth optical signal S ₄ to the corresponding signal providing end 28. The components through which the fourth optical signal S ₄ passes at the first signal receiving end 36 are a third fiber Bragg grating 82, a sixth optical circulator 80, a first optical coupler 68, and a second optical circulator 56 at the signal providing end. The elements that pass through 28 are the first optical circulator 52 and the first optical receiver 54.

In the first embodiment, in addition to the optical circulator and the fiber Bragg grating, the first optical modulation unit 60, the second optical modulation unit 62, and the third optical modulation unit 70 may also be micro-rings. Filter) implemented. Moreover, if network detection is not required, the first signal receiving end 36 may lack the third optical modulation unit 70 and be replaced by a seventh optical circulator. Therefore, the second optical filter 38 can receive the first optical signal S ₁ and the third optical signal S ₃ output by the second fiber Bragg grating 78 through the seventh optical circulator, and output multiple second optical signals S of different wavelengths according to the second optical filter 38. ₂ , for use by subsequent components. The components of the fourth optical signal S ₄ passing through the first signal receiving end 36 are a seventh optical circulator, a first optical coupler 68 and a second optical circulator 56.

The second embodiment will be described below, see Fig. 6. The second embodiment differs from the first embodiment in that the second embodiment lacks the third optical coupler 42. The third optical filter 40 is directly connected to all the second signal receiving ends 44, so that each of the second signal receiving ends 44 receives each of the second optical signals S ₂ . In addition, each of the second signal receiving ends 44 can also sequentially pass through the third optical filter 40, the second optical filter 38, the corresponding first signal receiving end 36, the optical splitter 34, the amplifier 33, and the first optical filter. 30 transmits the fourth optical signal S ₄ to the corresponding signal providing terminal 28.

The third embodiment will be described below, see Fig. 7. The third embodiment includes a plurality of signal providing terminals 28 respectively generating a first optical signal S ₁ carrying a lower transmission signal S _d , and all of the first optical signals S ₁ have different wavelengths. The signal providing terminal 28 is connected to a first optical filter 30, which receives all the first optical signals S ₁ and outputs them. The first optical filter 30 is connected to a splitter 34 through the two amplifiers 32 and 33, and receives all the first optical signals S ₁ through the amplifier 32 and outputs them. A first beam splitter 34 is connected to a plurality of signal receiving terminal 36, which respectively correspond to the signal lines 28 supply terminal, each of the first signal receiving terminal 36 receives all of the first optical signal S _1, and retrieve the corresponding supply terminal 28 of the signal generated by the The first optical signal S ₁ carrying the downlink signal S _d and the remaining first optical signal S _{1 are} output. The first signal receiving end 36 is connected to a second optical filter 38, which receives the first optical signal S ₁ from the first signal receiving end 36 and outputs it. The second optical filter 38 is coupled to a third optical filter 40 for receiving the first optical signal S ₁ from the second optical filter 38 and outputting a plurality of second optical signals S _{2 of} different wavelengths. The third optical filter 40 is connected to the plurality of third optical couplers 42, and each of the third optical couplers 42 is connected to the plurality of second signal receiving ends 44, and receives each second optical signal S ₂ for transmission to the corresponding The second signal receiving end 44. The first optical filter 30, the second optical filter 38, and the third optical filter 40 are all exemplified by an arrayed waveguide grating. Each of the second signal receiving ends 44 can also sequentially pass through the third optical coupler 42, the third optical filter 40, the second optical filter 38, the first signal receiving end 36, the optical splitter 34, the amplifier 33, and the first The optical filter 30 transmits a fourth optical signal S ₄ to the signal supply terminal 28.

Each signal providing end 28 further includes a first optical signal generator 84 that generates a first optical signal S ₁ . The first optical signal generator 84 is coupled to a first photo-electric modulator 86, such as a Mach-Zehnder modulator, a reflective semiconductor optical amplifier (RSOA), and an electro-absorption modulator (EAM). Or a Fabry-Perot laser diode (FP-LD), which receives the first optical signal S ₁ and the downlink signal S _d to modulate the first optical signal S ₁ There is a downlink signal S _d and it is output. The first photo-electric modulator 86 is connected to the first optical filter 30 to receive a first optical circulator 88, which receives the first optical signal S ₁ carrying the downlink signal S _d and transmits the first optical signal S ₁ through the first optical filter. 30. The amplifier 32 and the splitter 34 are output to all of the first signal receiving ends 36. Each of the first signal receiving ends 36 captures the corresponding first optical signal S ₁ to carry an upload signal S _u , and transmits the first optical signal S ₁ carrying the upload signal S _{u to} the optical splitter 34 and the amplifier. 33 and the first optical filter 30 are transmitted back to the corresponding first optical circulator 88. A first optical circulator 88 is connected to a first light receiver 90, such as an optical detector (PD) or the optical spectrum analyzer (the OSA), which system contains a first signal S _u upload the first optical circulator 88 receives from Optical signal S ₁ .

Each of the first signal receiving ends 36 further includes a second optical circulator 92 that is coupled to the optical splitter 34 and receives all of the first optical signals S ₁ therefrom for output. The second optical circulator 92 is connected to a first optical modulation unit 94, which receives all the first optical signals S ₁ from the second optical circulator 92 and is connected to a second optical receiver through a first optical coupler 96. 98 and a third optical circulator 100, wherein the second optical receiver 98 can be implemented by PD or OSA. The first optical modulation unit 94 transmits the corresponding first optical signal S ₁ to the second optical receiver 98 and the third optical circulator 100 carrying the downlink signal S _d through the first optical coupler 96, and outputs the remaining An optical signal S ₁ . The third optical circulator 100 is coupled to a second photo modulator 102, such as a Mach-Zehnder modulator, a reflective semiconductor optical amplifier, an electro-absorption modulator or an FP-LD, which receives a corresponding response from the third optical circulator 100. The first optical signal S ₁ and receives the upload signal S _u . The third optical circulator 100 is connected to the second optical circulator 92 through a second optical coupler 104. The first optical signal S ₁ corresponding to the modulation of the second photoelectric modulator 102 carries the upload signal S _u and sequentially passes through the third optical circulator 100 , the second optical coupler 104 and the second optical circulator 92 . Output to the beam splitter 34. In addition, the first optical modulation unit 94 is coupled to a second optical modulation unit 106 that is coupled to the second optical circulator 92 through the second optical coupler 104. The second optical modulation unit 106 receives the first optical signal S ₁ output by the first optical modulation unit 94 and selects at least one of them as a recognized optical signal, and the rest applies the optical signal as a plurality. The second optical modulation unit 106 sequentially transmits the identification optical signals to the second optical coupler 104, the second optical circulator 92, the optical splitter 34, the amplifier 33, the first optical filter 30, and the first optical circulator 86. Returning to the first optical receiver 90, the application optical signal is simultaneously outputted to the second optical filter 38. As in the first embodiment, by identifying the optical signal, it is possible to detect whether the network is faulty.

The first optical modulation unit 94 further includes a fourth optical circulator 108 and a first fiber Bragg grating 110. The fourth optical circulator 108 is connected to the second optical circulator 92 and the first optical coupler 96 to receive all of the first optical signals S ₁ and output them. The first fiber Bragg grating 110 is connected to the fourth optical circulator 108 to receive all the first optical signals S ₁ and transmits the corresponding first optical signal S ₁ to the first optical circulator 108 and the first optical coupler 96 to The second optical receiver 98 and the third optical circulator 100 further output the remaining first optical signals S ₁ . The second optical modulation unit 106 further includes a fifth optical circulator 112 and a second fiber Bragg grating 114. The fifth optical circulator 112 connects the first fiber Bragg grating 110 and the second optical coupler 104 to receive the first optical signal S ₁ output by the first fiber Bragg grating 110 and output it. The second fiber Bragg grating 114 is connected to the fifth optical circulator 112 to receive the first optical signal S ₁ , and transmits the identification optical signal to the second optical coupler 104 through the fifth optical circulator 112 , and then applies the optical signal output. .

The signal transmission process of the third embodiment will be described below. First, the first optical signal generator 84 of each signal providing terminal 28 generates a first optical signal S ₁ . Then, the first photo-modulator 86 receives the first optical signal S ₁ and transmits the upper and lower signals S _d , and then sequentially passes through the first optical circulator 88 , the first optical filter 30 , the amplifier 32 , and the optical splitter . 34, passed to all the first signal receiving ends 36. The second optical circulator 92 receives all of the first optical signals S ₁ from the beam splitter 34 and transmits them to the first fiber Bragg grating 110 through the fourth optical circulator 108. The first fiber Bragg grating 110 transmits the corresponding first optical signal S ₁ to the second optical receiver 98 and the third optical circulator 100 through the fourth optical circulator 108 and the first optical coupler 96, and the rest The first optical signal S ₁ is output to the second fiber Bragg grating 114 through the fifth optical circulator 112. The third optical circulator 100 transmits the first optical signal S ₁ to the second photo-modulator 102, and the first optical signal S ₁ corresponding to the second photo-modulator 102 is modulated by the upload signal S _u and The sequence is transmitted to the third optical circulator 100, the second optical coupler 104, the second optical circulator 92, the optical splitter 34, the amplifier 33, the first optical filter 30, and the corresponding first optical circulator 88. Corresponding to the first light receiver 90. Meanwhile, the second fiber Bragg grating 114 from the received first optical signal S _1, selecting at least one of the optical signal as an identification, the remaining optical signal as a complex application. The second fiber Bragg grating 114 sequentially passes through the fifth optical circulator 112, the second optical coupler 104, the second optical circulator 96, the optical splitter 34, the amplifier 33, the first optical filter 30, and the corresponding first optical cycle. The device 88 transmits the identification optical signal back to the corresponding first optical receiver 90, and outputs the applied optical signal to the second optical filter 38. The third optical filter 40 receives the applied optical signal from the second optical filter 38 and outputs a plurality of second optical signals S _{2 of} different wavelengths accordingly. Each of the third optical couplers 42 receives each of the second optical signals S ₂ for transmission to the corresponding second signal receiving end 44. In addition, each of the second signal receiving ends 44 can also sequentially transmit through the third optical coupler 42, the third optical filter 40, the second optical filter 38, the corresponding first signal receiving end 36, the optical splitter 34, and the amplifier. 33 and the first optical filter 30 transmit the fourth optical signal S ₄ to the corresponding signal providing end 28. The components of the fourth optical signal S ₄ passing through the first signal receiving end 36 are the second fiber Bragg grating 114, the fifth optical circulator 112, the second optical coupler 104, and the second optical circulator 92 at the signal providing end. The element that passes through 28 is the first optical circulator 88 and the first optical receiver 90.

In the third embodiment, in addition to the optical circulator and the fiber Bragg grating, the first optical modulation unit 94 and the second optical modulation unit 106 can also be implemented by a micro-ring filter. Moreover, if network detection is not required, the first signal receiving end 36 may lack the second optical modulation unit 106 and be replaced by a sixth optical circulator. Therefore, the second optical filter 38 can receive the first optical signal S ₁ outputted by the first fiber Bragg grating 110 through the sixth optical circulator, and output a plurality of second optical signals S _{2 of} different wavelengths for subsequent components. . The components through which the fourth optical signal passes at the first signal receiving end 36 are a seventh optical circulator, a second optical coupler 104, and a second optical circulator 92.

The fourth embodiment will be described below, see Fig. 8. The fourth embodiment differs from the third embodiment in that the fourth embodiment lacks the third optical coupler 42. The third optical filter 40 is directly connected to all the second signal receiving ends 44, so that each of the second signal receiving ends 44 receives each of the second optical signals S ₂ . In addition, each of the second signal receiving ends 44 can also sequentially pass through the third optical filter 40, the second optical filter 38, the corresponding first signal receiving end 36, the optical splitter 34, the amplifier 33, and the first optical filter. 30 transmits the fourth optical signal S ₄ to the corresponding signal providing terminal 28.

The fifth embodiment will be described below, see Fig. 9. The fifth embodiment includes a plurality of signal providing terminals 28 respectively generating a first optical signal S ₁ carrying a lower transmission signal S _d , and the wavelengths of all the first optical signals S _{1 are} different. The signal providing terminal 28 is connected to a first optical filter 30, which receives the first optical signal S ₁ and outputs it. The first optical filter 30 is connected to a splitter 34 through the two amplifiers 32 and 33, and receives the first optical signal S ₁ through the amplifier 32 and outputs it. A first beam splitter 34 is connected to a plurality of signal receiving terminal 36, which respectively correspond to the signal lines 28 supply terminal, each of the first signal receiving terminal 36 receives the first optical signal S _1, and the capture of the corresponding carrier signals generated to provide the end 28 There is a first optical signal S _{1 of the} downlink signal S _d , and the remaining first optical signal S ₁ is output. The first signal receiving end 36 is connected to a second optical filter 38, which receives the first optical signal S ₁ from the first signal receiving end 36 and outputs it. The second optical filter 38 is coupled to a third optical filter 40 for receiving the first optical signal S ₁ from the second optical filter 38 and outputting a plurality of second optical signals S _{2 of} different wavelengths. The third optical filter 40 is connected to the plurality of third optical couplers 42, and each of the third optical couplers 42 is connected to the plurality of second signal receiving ends 44, and receives each second optical signal S ₂ for transmission to the corresponding The second signal receiving end 44. The first optical filter 30, the second optical filter 38, and the third optical filter 40 are all exemplified by an arrayed waveguide grating. Each of the second signal receiving ends 44 can also sequentially pass through the third optical coupler 42, the third optical filter 40, the second optical filter 38, the first signal receiving end 36, the optical splitter 34, the amplifier 33, and the first The optical filter 30 transmits a fourth optical signal S ₄ to the signal supply terminal 28.

Each signal providing end 28 further includes a first optical signal generator 116 that generates a first optical signal S ₁ . The first optical signal generator 116 is coupled to a first photo-electric modulator 118, such as a Mach-Zehnder modulator, a reflective semiconductor optical amplifier (RSOA), or an electro-absorption modulator (EAM). Or a Fabry-Perot laser diode (FP-LD), the first photo-modulator 118 is connected to the first optical filter 30, and receives the first optical signal S ₁ and the lower transmission No. S _d , the modulated first optical signal S ₁ carries a downlink signal S _d , which is sequentially transmitted to the first signal receiving end 36 through the first optical filter 30 , the amplifier 32 and the optical splitter 34 . The signal providing terminal 28 also includes a first optical receiver 120, such as a photodetector (PD) or an optical spectrum analyzer (OSA), which is coupled to the first optical filter 30, and each of the first signal receiving terminals 36 captures Corresponding to the first optical signal S ₁ , and using a third optical signal S _{3 to} carry an upload signal S _u , the third optical signal S ₃ carrying the upload signal S _u is transmitted through the optical splitter 34 , the amplifier 33 and the first light The filter 30 is transmitted back to the corresponding first optical receiver 120, and all the third optical signals S _{3 are} different from the wavelengths of all the first optical signals S ₁ .

Each of the first signal receiving ends 36 further includes a first optical circulator 122 that is connected to the optical splitter 34 and receives all of the first optical signals S ₁ for output. The first optical circulator 122 is coupled to a first optical modulation unit 124, and the first optical modulation unit 124 is coupled to a second optical receiver 126, such as a PD or an OSA. The first optical modulation unit 124 receives all the first optical signals S ₁ from the first optical circulator 122 and transmits the corresponding first optical signal S ₁ to the second optical receiver 124 carrying the downlink signal S _d , and The remaining first optical signal S _{1 is} output. Another one of generating a third light signal S ₃ of the second optical signal generator 128 which sequentially through a second photo-based modulator 130 and a first optical coupler 132 is connected to a first optical circulator 122. The second photo-modulator 130 can be implemented by a Mach-Zehnder modulator, a reflective semiconductor optical amplifier, an electro-absorption modulator, or an FP-LD. The second photo-electric modulator 130 receives the third optical signal S ₃ and the upload signal S _u , and modulates the third optical signal S _{3 to} carry the upload signal S _u and transmits the first optical coupler 132 and the first light. The circulator 122 is output to the beam splitter 34. In addition, the first optical modulation unit 124 is coupled to a second optical modulation unit 134 that is coupled to the first optical circulator 122 through the first optical coupler 132. The second optical modulation unit 134 receives the first optical signal S ₁ output by the first optical modulation unit 124 and selects at least one of them as a recognized optical signal, and the rest applies the optical signal as a plurality. The second optical modulation unit 134 sequentially transmits the identification optical signal to the first optical receiver 132, the first optical circulator 122, the optical splitter 34, the amplifier 33, and the first optical filter 30, and returns the optical signal to the first optical receiver. In 120, the application optical signal is simultaneously outputted to the second optical filter 38. As in the second embodiment, by identifying the optical signal, it is possible to detect whether the network is faulty.

The first optical modulation unit 124 further includes a second optical circulator 136 and a first fiber Bragg grating 138. The second optical circulator 136 is connected to the first optical circulator 122 and the second optical receiver 126 to receive all of the first optical signals S ₁ and output them. The second optical circulator 136 is connected to the first fiber Bragg grating 138, which receives all the first optical signals S ₁ from the second optical circulator 136 and transmits the corresponding first optical signal S ₁ through the second optical circulator 136. To the second optical receiver 126, the remaining first optical signals S _{1 are} output. The second optical modulation unit 134 further includes a third optical circulator 140 and a second fiber Bragg grating 142. The third optical circulator 140 connects the first fiber Bragg grating 138 and the first optical coupler 132 to receive the first optical signal S ₁ output by the first fiber Bragg grating 138 and output it. The second fiber Bragg grating 142 is connected to the third optical circulator 140 to receive the first optical signal S ₁ , and transmits the identification optical signal to the first optical coupler 132 through the third optical circulator 140 , and then applies the optical signal output. .

The signal transmission process of the fifth embodiment will be described below. First, the first optical signal generator 116 of each signal providing terminal 28 generates a first optical signal S ₁ . Then, the first photo-modulator 118 receives the first optical signal S ₁ and transmits it to the upper and lower signals S _d , and sequentially transmits the first optical filter 30 , the amplifier 32 and the optical splitter 34 to all the first The signal is received in terminal 36. The first optical circulator 122 receives all of the first optical signals S ₁ from the beam splitter 34 and transmits them through the second optical circulator 136 to the first fiber Bragg grating 138. Then, the first optical fiber Bragg grating 138 transmits the corresponding first optical signal S ₁ to the second optical receiver 126 through the second optical circulator 136, and outputs the remaining first optical signal S _{1 to the} third optical circulator 140. To the second fiber Bragg grating 142. A second fiber Bragg grating 142 from the received first optical signal S _1, selecting at least one of the optical signal as an identification, the remaining optical signal as a complex application. The second fiber Bragg grating 142 sequentially transmits the identification optical signal through the first optical coupler 132, the first optical circulator 122, the optical splitter 34, the amplifier 33 and the first optical filter 30, and returns to the corresponding first optical receiving. In the device 120, the application optical signal is simultaneously outputted to the second optical filter 38. In addition, the second optical signal generator 128 generates the third optical signal S ₃ , and the second photoelectric modulator 130 receives the third optical signal S ₃ and the upload signal S _u , and modulates the third optical signal S ₃ . The signal S _{u is} uploaded and transmitted through the first optical coupler 132, the first optical circulator 122, the optical splitter 34, the amplifier 33 and the first optical filter 30, and then transmitted back to the corresponding first optical receiver 120. in. The third optical filter 40 receives the applied optical signal from the second optical filter 38 and outputs a plurality of second optical signals S _{2 of} different wavelengths accordingly. Each of the third optical couplers 42 receives each of the second optical signals S ₂ for transmission to the corresponding second signal receiving end 44. In addition, each of the second signal receiving ends 44 can also sequentially transmit through the third optical coupler 42, the third optical filter 40, the second optical filter 38, the corresponding first signal receiving end 36, the optical splitter 34, and the amplifier. 33 and the first optical filter 30 transmit the fourth optical signal S ₄ to the corresponding signal providing end 28. The component of the fourth optical signal S ₄ passing through the first signal receiving end 36 is a second fiber Bragg grating 142, a third optical circulator 140, a first optical coupler 132, and a first optical circulator 122 at the signal providing end. In 28, it is directly transmitted to the first optical receiver 120.

In the fifth embodiment, in addition to the optical circulator and the fiber Bragg grating, the first optical modulation unit 124 and the second optical modulation unit 134 may also be implemented by a micro-ring filter. Moreover, if network detection is not required, the first signal receiving end 36 may lack the second optical modulation unit 134 and be replaced by a fourth optical circulator. Therefore, the second optical filter 38 can receive the first optical signal S ₁ outputted by the first fiber Bragg grating 138 through the fourth optical circulator, and output a plurality of second optical signals S _{2 of} different wavelengths for subsequent components. . The other fourth optical signal S ₄ passes through the first optical receiving end 36 as a seventh optical circulator, a first optical coupler 132 and a first optical circulator 122.

The sixth embodiment will be described below, see Fig. 10. The sixth embodiment differs from the fifth embodiment in that the sixth embodiment lacks the third optical coupler 42. The third optical filter 40 is directly connected to all the second signal receiving ends 44, so that each of the second signal receiving ends 44 receives each of the second optical signals S ₂ . In addition, each of the second signal receiving ends 44 can also sequentially pass through the third optical filter 40, the second optical filter 38, the corresponding first signal receiving end 36, the optical splitter 34, the amplifier 33, and the first optical filter. 30 transmits the fourth optical signal S ₄ to the corresponding signal providing terminal 28.

The invention has very good expandability. When the speed of the first signal receiving end is to be improved, there is no need to change the optical distribution network (ODN), and only the number of wavelengths received by the first signal receiving end needs to be increased. As long as more fiber Bragg gratings are added, the need to receive multiple frequency bands can be achieved to achieve the goal of increasing the number of users, increasing the speed, and not changing the network architecture. The method of adding the fiber Bragg grating is only for the component insertion and removal of a specific signal receiving end, and has almost no cost consideration, so it has high economy.

It can be seen from the above six embodiments that the present invention is based on a time division multiplexed passive optical network (TWDM-PON), which is a new multiplexed passive optical network (WDM-PON) at the rear end of the TWDM-PON to increase the shunt. Split ratio. Increasing the number of wavelengths used in the network can also increase the overall amount of data transferred. In addition, Figure 4 shows the early proposed WDM-TDM-PON architecture with the most compact component usage and network simplicity. WDM-TDM-PON has many The advantages that other architectures cannot replace, based on the maximum development of each architecture, WDM-TDM-PON is an architecture that is very likely to develop in the future. If WDM-TDM-PON is to become the choice of future network architecture, it is necessary to provide an intermediary network architecture to achieve seamless integration. The present invention is suitable for playing such an intermediary architecture to achieve a seamless integration. When the first signal receiving end of the present invention is slowly replaced over time, the network architecture of the present invention can be seamlessly converted into a WDM-PON or WDM-TDM-PON based network architecture. In other words, the present invention is very important and highly economical, both as a TWDM-PON expansion network or as an intermediary medium for WDM-TDM-PON networks.

Figure 11(a) shows the experimental structure of the downlink signal. The laser generator 144 emits a laser, which is first modulated by a Mach-Zehnder modulator 146 and then input into a 40 km fiber through the optical circulator 147. After the far-end signal is amplified by the amplifier 149 via the optical circulator 148, an 18 millidB (dBm) attenuator 150 is input. 18 dBm is used to simulate 64 split ratios, and the 64-split number is in the TWDM architecture. Basic requirements. After the 18 dBm attenuator 150, the optical signals pass through the first fiber Bragg grating 152 and the second fiber Bragg grating 154, respectively. Here, in order to consider the worst case of the cascade attenuation of the fiber Bragg grating, the wavelength of the down signal can be adjusted to be the same as the wavelength of the second fiber Bragg grating 154. Therefore, the down signal will pass through the first fiber Bragg grating 152 and be bounced by the second fiber Bragg grating 154. The down signal enters the optical circulator 156 and is received by the photodetector 158 via the attenuator 157. Figure 11(b) shows the experimental structure of the upload signal. The laser generator 160 emits a laser, and the laser directly outputs the 40km optical fiber by the optical circulator 162. After the signal passes through the optical circulator 163, the optical signal is amplified by the amplifier 164, and an 18 dBm attenuator 166 is used to simulate the 64-split number. The attenuator 166 then passes through the first fiber Bragg grating 168, the optical circulator 169, and the second fiber Bragg grating 170 as well. Similarly, in order to consider the worst case of the series loss, we adjust the uploading carrier to the same wavelength as the second fiber Bragg grating 170. The uploading carrier is rebounded by the second fiber Bragg grating 170 and sequentially enters the optical circulator 169 and the light cycle The 172 is driven into the reflective semiconductor optical amplifier 174 to perform an amplitude modulation signal, and finally an attenuator 176 is driven. The attenuator 176 has the same attenuation of 18 dBm, mainly for simulating the same amount of energy that the optical signal will attenuate in both directions of the optical coupler. After the upload signal passes through the amplifier 177, the optical fiber and the optical circulator 163, it returns to the optical circulator 162 and enters an optical tunable filter (OTF) 178. In this optical filter 178 is to simulate the AWG channel of the OLT end, the wavelength of the OTF 178 is the same as the upload signal. After the OTF 178, the optical signal is received by the photodetector 180 via the attenuator 179.

Figures 12(a) and 12(b) show the error rate distribution of the downlink signal and the upload signal, respectively. The diamond represents the data of the docking measurement, and the square represents the data of 40 kilometers of the signal transmission. As can be seen from the two figures, both the downlink signal and the upload signal can achieve a bit error rate (BER) of 10 ^-9 , which proves that the network architecture of the present invention can be implemented.

In summary, the present invention creates a new split-wave multiplexing passive optical network (WDM-PON) at a low cost after the first signal receiving end, so as to improve the split ratio, the transmission speed and the data transmission amount, and at the same time, Switch to WDM-TDM-PON for future network needs.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, so that the shapes, structures, features, and spirits described in the claims of the present invention are equally varied and modified. All should be included in the scope of the patent application of the present invention.

28‧‧‧ Signal provider

30‧‧‧First optical filter

32‧‧‧Amplifier

33‧‧‧Amplifier

34‧‧‧Abeam splitter

36‧‧‧First signal receiver

38‧‧‧Second optical filter

40‧‧‧ Third optical filter

42‧‧‧The third optocoupler

44‧‧‧second signal receiver

46‧‧‧First optical signal generator

48‧‧‧First photoelectric transducer

50‧‧‧Second optical signal generator

52‧‧‧First optical circulator

54‧‧‧First light receiver

56‧‧‧Second optical circulator

58‧‧‧Second light receiver

60‧‧‧First optical modulation unit

62‧‧‧Second light modulation unit

64‧‧‧The third optical circulator

66‧‧‧Second photoelectric transducer

68‧‧‧First Optocoupler

70‧‧‧ Third optical modulation unit

72‧‧‧fourth optical circulator

74‧‧‧First fiber Bragg grating

76‧‧‧The fifth optical circulator

78‧‧‧Second fiber Bragg grating

80‧‧‧ sixth optical circulator

82‧‧‧ third fiber Bragg grating

Claims (20)

A passive optical network system includes: a plurality of signal providing terminals respectively generating a first optical signal and a third optical signal carrying a first transmission signal, and the first optical signal and the third optical signal The wavelengths are all different; a first optical filter is connected to the signal providing ends to receive the first optical signals and the third optical signals, and output the same; a beam splitter is connected to the first optical filter And outputting the first optical signals and the third optical signals; the plurality of first signal receiving ends are connected to the optical splitters, and respectively corresponding to the signal providing ends, each of the first signal receiving ends receiving the The first optical signal and the third optical signals, and the first optical signal generated by the signal providing end carrying the downlink signal, and the remaining first optical signals, each of which is output The first signal receiving end captures the corresponding third optical signal to carry an upload signal, and transmits the third optical signal carrying the uploaded signal to the first optical filter through the optical splitter. To the corresponding signal providing end; a second optical filter And connecting the first signal receiving ends to receive the remaining first optical signals and outputting the same; a third optical filter connecting the second optical filters to receive the remaining first An optical signal, and correspondingly outputting a plurality of second optical signals of different wavelengths; and a plurality of second signal receiving ends connected to the third optical filter to receive the second optical signals; each of the first signal receiving ends is further The method includes: a second optical circulator, connecting the optical splitter, and receiving the first optical signal and the third optical signals to output the same; a first optical modulation unit connected to the second optical circulator And a second optical receiver for receiving the first optical signal and the third optical signals, and transmitting the corresponding Transmitting the first optical signal of the signal to the second optical receiver, and outputting the remaining first optical signals and the third optical signals; and a second optical modulation unit connecting the first optical modulation The unit and a third optical circulator to receive the remaining first optical signals and the third optical signals, and transmit the corresponding third optical signals to the third optical circulator, and output the remaining The first optical signal and the remaining third optical signals; and a second optical modulator connected to the third optical circulator to receive the third optical signal and receive the upload signal, the third optical cycle Connected to the second optical circulator, the second photo modulator modulates the third optical signal to carry the upload signal, and sequentially passes through the third optical circulator and the second optical circulator to output In the splitter. The passive optical network system of claim 1, wherein each of the signal providing ends further comprises: a first optical signal generator for generating the first optical signal; and a first photoelectric modulator connected to the first The optical signal generator and the first optical filter receive the first optical signal and the downlink signal to modulate the first optical signal to carry the downlink signal and transmit the downlink signal to the first optical filter. a second optical signal generator for generating the third optical signal; a first optical circulator coupled to the second optical signal generator for receiving the third optical signal and transmitting the third optical signal The third optical signal carrying the upload signal is transmitted back to the corresponding optical filter through the optical splitter and the first optical filter. The first optical circulator; and a first optical receiver connected to the first optical circulator to receive the third optical signal carrying the uploaded signal. The passive optical network system of claim 1, wherein each of the first signal receiving ends is further included a third optical modulation unit connected to the second optical modulation unit and connected to the second optical circulator through a first optical coupler, the first optical coupler being connected to the third optical circulator The third optical modulation unit receives the remaining first optical signals and the remaining third optical signals, and selects at least one of them as an identification optical signal, and the rest applies the optical signal as a plurality of optical signals. The modulating unit sequentially transmits the identification optical signal to the first optical coupler, the second optical circulator, the optical splitter, the first optical filter and the first optical circulator, and returns the first optical light to the first optical multiplexer. In the receiver, the application optical signals are simultaneously output. The passive optical network system of claim 3, wherein the first optical modulation unit further comprises: a fourth optical circulator connecting the second optical circulator and the second optical receiver to receive the a first optical signal and the third optical signal; and a first fiber Bragg grating connected to the fourth optical circulator to receive the first optical signal and the third optical signal, and Transmitting the corresponding first optical signal to the second optical receiver through the fourth optical circulator, and outputting the remaining first optical signals and the third optical signals; the second optical modulation The unit further includes: a fifth optical circulator connecting the first fiber Bragg grating and the third optical circulator to receive the remaining first optical signals and the third optical signals; and a second optical fiber Bragg a grating connected to the fifth optical circulator to receive the remaining first optical signals and the third optical signals, and the corresponding third optical signals are transmitted to the third optical multiplexer through the fifth optical circulator The optical circulator, and the remaining first optical signals The remaining third optical signal outputs; and the third optical modulation unit further includes: a sixth optical circulator connecting the second fiber Bragg grating and the first optical coupler to receive the remaining first The optical signal and the remaining third optical signals; a third fiber Bragg grating connected to the sixth optical circulator to receive the remaining first optical signals and the remaining third optical signals, and transmitting the identified optical signals to the sixth optical circulator to The first optical coupler outputs the application optical signals. The passive optical network system of claim 1, further comprising a plurality of third optical couplers connected to the third optical filter, and each of the third optical couplers is connected to the second signal receiving ends, And receiving each of the second optical signals separately for transmission to the corresponding second signal receiving ends. The passive optical network system of claim 5, wherein each of the second signal receiving ends sequentially transmits the third optical coupler, the third optical filter, the second optical filter, and the first signal The receiving end, the optical splitter and the first optical filter transmit a fourth optical signal to the signal providing end. A passive optical network system includes: a plurality of signal providing ends respectively generating a first optical signal carrying one of the following transmission signals, the wavelengths of the first optical signals are different; a first optical filter is connected The signal providing ends receive the first optical signals and output the same; a beam splitter is connected to the first optical filter to output the first optical signals; and the plurality of first signal receiving ends are connected The optical splitters are respectively corresponding to the signal providing ends, and each of the first signal receiving ends receives the first optical signals, and the corresponding signal generating end generates the first transmitting signal An optical signal, which outputs the remaining first optical signals, each of the first optical signals received by the first signal receiving end, carrying an upload signal, and the first light carrying the uploaded signal The signal is transmitted back to the corresponding signal providing end through the optical splitter and the first optical filter; a second optical filter is connected to the first signal receiving ends to receive the remaining first optical signals and output the same; a third optical filter is connected to the second optical filter to receive the And the remaining first optical signals, and correspondingly outputting the plurality of second optical signals of different wavelengths; and the plurality of second signal receiving ends connected to the third optical filter to receive the second optical signals; each of the The signal receiving end further includes: a second optical circulator connected to the optical splitter and receiving the first optical signals to output the same; a first optical modulating unit connected to the second optical circulator to Receiving the first optical signals, and connecting a second optical receiver and a third optical circulator through a first optical coupler, wherein the first optical modulating unit transmits the corresponding optical transceiver through the first optical coupler The first optical signal of the downlink signal to the second optical receiver and the third optical circulator, and outputting the remaining first optical signals; and a second photoelectric modulator connected to the third optical a circulator to receive the corresponding first optical signal and receive the a third optical circulator connected to the second optical circulator, the second optical modulator modulating the corresponding first optical signal carrying the upload signal, and sequentially transmitting the third optical light The circulator and the second optical circulator are output to the splitter. The passive optical network system of claim 7, wherein each of the signal providing ends further comprises: a first optical signal generator for generating the first optical signal; and a first photoelectric modulator connected to the first An optical signal generator, and receiving the first optical signal and the downlink signal to adjust the first optical signal to carry the downlink signal, and output the same; a first optical circulator to connect the first optical tone And the first optical filter receives the first optical signal carrying the downlink signal and transmits the first optical signal to the first optical filter and the optical splitting The first signal receiving end is sent to the first signal receiving end, and the first signal receiving end transmits the first optical signal carrying the uploading signal to the corresponding first optical filter through the optical splitter to the corresponding first An optical circulator; and a first optical receiver connected to the first optical circulator to receive the first optical signal carrying the uploaded signal. The passive optical network system of claim 7, wherein each of the first signal receiving ends further comprises a second optical modulation unit connected to the first optical modulation unit and coupled to a second optical coupling. The second optical circulator is connected to the third optical circulator, and the second optical modulating unit receives the remaining first optical signals and selects at least one of them as a recognized light. The signal is used as a plurality of optical signals, and the second optical modulation unit sequentially transmits the identification optical signal through the second optical coupler, the second optical circulator, the optical splitter, and the first optical filter. The first optical circulator is returned to the first optical receiver and simultaneously outputs the application optical signals. The passive optical network system of claim 9, wherein the first optical modulation unit further comprises: a fourth optical circulator connecting the second optical circulator and the first optical coupler to receive the a first optical signal; and a first fiber Bragg grating connected to the fourth optical circulator to receive the first optical signals, and the corresponding first optical signal is transmitted through the fourth optical circulator and the first optical circulator An optical coupler is transmitted to the second optical receiver and the third optical circulator, and the remaining first optical signals are output; and the second optical modulating unit further includes: a fifth optical circulator, Connecting the first fiber Bragg grating and the second optical coupler to receive the remaining first optical signals; and a second fiber Bragg grating connected to the fifth optical circulator to receive the remaining The first optical signal is transmitted to the second optical coupler through the fifth optical circulator, and the application optical signals are output. The passive optical network system of claim 7, further comprising a plurality of third optical couplers connected to the third optical filter, and each of the third optical couplers is connected to the second signal receiving ends, And receiving each of the second optical signals separately for transmission to the corresponding second signal receiving ends. The passive optical network system of claim 11, wherein each of the second signal receiving ends sequentially transmits the third optical coupler, the third optical filter, the second optical filter, and the first signal The receiving end, the optical splitter and the first optical filter transmit a fourth optical signal to the signal providing end. A passive optical network system includes: a plurality of signal providing ends respectively generating a first optical signal carrying one of the following transmission signals, the wavelengths of the first optical signals are different; a first optical filter is connected The signal providing ends receive the first optical signals and output the same; a beam splitter is connected to the first optical filter to output the first optical signals; and the plurality of first signal receiving ends are connected The optical splitters are respectively corresponding to the signal providing ends, and each of the first signal receiving ends receives the first optical signals, and the corresponding signal generating end generates the first transmitting signal An optical signal, which outputs the remaining first optical signals, each of the first signal receiving ends carrying an uploading signal by using a third optical signal, and transmitting the third optical signal carrying the uploaded signal to the optical splitter and The first optical filter is transmitted back to the corresponding signal providing end, and the third optical signals are different from the wavelengths of the first optical signals; a second optical filter is connected to the first signals to receive End to receive the rest of the number Light And outputting a signal; a third optical filter connected to the second optical filter to receive the remaining first optical signals, and outputting a plurality of second optical signals of different wavelengths; and a plurality of second The signal receiving end is connected to the third optical filter to receive the second optical signals; each of the first signal receiving ends further includes: a first optical circulator, connecting the optical splitters, and receiving the first optical signals The first optical modulating unit is connected to the first optical circulator and the second optical receiver to receive the first optical signals, and the corresponding ones carry the downlink signals The first optical signal to the second optical receiver, and output the remaining first optical signals; a second optical signal generator to generate the third optical signal; and a second photoelectric modulator connected The first optical circulator and the second optical signal generator receive the third optical signal and receive the upload signal, and the second photoelectric modulator modulates the third optical signal to carry the upload signal, and It is output to the spectroscope through the first optical circulator. The passive optical network system of claim 13, wherein each of the signal providing ends further comprises: a first optical signal generator for generating the first optical signal; and a first photoelectric modulator connected to the first The optical signal generator and the first optical filter receive the first optical signal and the downlink signal to modulate the first optical signal to carry the downlink signal, and sequentially transmit the first optical signal through the first optical filter. And the first optical receiver is connected to the first optical filter, and each of the first signal receiving ends carries the third optical light of the uploaded signal The signal is transmitted back to the corresponding first optical receiver through the optical splitter and the first optical filter. The passive optical network system of claim 13, wherein each of the first signal receiving ends further comprises a second optical modulation unit connected to the first optical modulation unit and coupled through a first optical coupling The first optical coupler is connected to the second optical modulator, and the second optical modulating unit receives the remaining first optical signals and selects at least one of them as an identifier. The optical signal is used as a plurality of optical signals, and the second optical modulation unit sequentially transmits the identification optical signal to the first optical coupler, the first optical circulator, the optical splitter, and the first optical filter. And returning to the first optical receiver, and simultaneously outputting the application optical signals. The passive optical network system of claim 15, wherein the first optical modulation unit further comprises: a second optical circulator connecting the first optical circulator and the second optical receiver to receive the a first optical signal; and a first fiber Bragg grating connected to the second optical circulator to receive the first optical signals, and transmit the corresponding first optical signal to the second optical circulator to the The second optical receiver outputs the remaining first optical signals; and the second optical modulation unit further includes: a third optical circulator connecting the first optical fiber Bragg grating and the first optical coupler Receiving the remaining first optical signals; and a second fiber Bragg grating connected to the third optical circulator to receive the remaining first optical signals and transmitting the identified optical signals through the third optical The circulator is transmitted to the first optical coupler, and the application optical signals are output. The passive optical network system of claim 15, wherein the first optical modulation unit and the second optical modulation unit are both micro-ring filters. The passive optical network system of claim 13, wherein the first optical filter, the second optical filter, and the third optical filter are both arrayed waveguide gratings. The passive optical network system of claim 13, further comprising a plurality of third optical couplers connected to the third optical filter, and each of the third optical couplers is connected to the second signal receiving ends, And receiving each of the second optical signals separately for transmission to the corresponding second signal receiving ends. The passive optical network system of claim 17, wherein each of the second signal receiving ends sequentially transmits the third optical coupler, the third optical filter, the second optical filter, and the first signal The receiving end, the optical splitter and the first optical filter transmit a fourth optical signal to the signal providing end.