TWI473446B - Apparatus and method for effective importing NG PON network to existing E / G PON network infrastructure - Google Patents

Description

Apparatus and method for efficiently importing NG PON network to existing E/G PON network infrastructure

The invention belongs to a bifurcator device and a method thereof, and more particularly to an active optical power splitter device and a method thereof for introducing an NG PON into an existing E/G PON infrastructure.

First, the system works

In EPON and GPON systems, the process of downlink data transmission from the equipment room end equipment (OLT) to multiple customer equipment (ONU) is fundamentally different from the process of transmitting data from multiple ONUs to the OLT.

Data is broadcasted from the OLT to multiple ONUs via an Optical Splitter. Each packet carries an identification code that identifies whether the packet is addressed to ONU-1, ONU-2, or ONU-n. Some packets may also be sent to all ONUs (broadcast packets) or to specific ONU groups (multicast packets). When the data arrives at the ONU, the ONU accepts the packet destined for it and discards the packet sent to other ONUs.

The EPON and GPON uplink transmission data is in a burst mode, and the TDM technology is used to manage the uplink transmission data. The time slot is used to synchronize the transmission data time gap of the ONU, so that the uplink transmission is performed. When data is merged into a common fiber (upstream transmission direction, Optical Splitter's Output port), packets from each ONU do not interfere with each other. For example, the ONU-1 packet is transmitted during the first time interval, ONU-2 The packets are transmitted in the second non-overlapping time slot, while the ONU-n packets are transmitted in the nth non-overlapping time slot.

Second, the light system design

EPON and GPON can be implemented with two or three wavelengths. The two-wavelength design is ideal for delivering data, voice and IPTV video services. A three-wavelength design is required if a radio frequency (RF) television service (CATV) is to be provided.

Two-wavelength design: In this configuration, the 1490 nm wavelength carries data, video, and voice downlink transmissions, while the 1310 nm wavelength is used to carry video on demand (VOD), channel change requests, and data and voice uplink transmission. Transmission rate: EPON uses 1.25 Gbps for both uplink and downlink; and GPON uplink/downlink uses 1.244/2.488 Gbps. With this device, the PON has an effective range of up to 20 km at 1:32 Optical Splitter.

Three-wavelength design: In this configuration, the 1490 nm wavelength and the 1310 nm wavelength are used for the downstream and upstream directions, respectively, while the 1550 nm wavelength is reserved for the downstream video signal. The video is encoded in MPEG2 and carried on a QAM (Quadrature Amplitude Modulation) carrier. With this device, the PON has an effective range of up to 18 km at 1:32 Optical Splitter.

The invention provides an active optical power splitter (Active Splitter) component, which comprises a light wave multiplexer, an optical amplifier, an optical circulator, a 1:M optical power splitter, etc., and an Active Splitter NG PON ( Next Generation Passive Optical Network) A high-speed ODN (Optical Distribution Network) optical interface downstream of the central office equipment After the signal is amplified, the transmission signal is amplified by the optical amplifier, and the intensity-amplified transmission signal is divided into multiple routes by using the optical power splitter, wherein each of the routing signals is respectively transmitted with an ODN optical interface of the E/G PON. The signal is multiplexed together by a Wavelength Division Multiplexing Filter (WDM1r) and split into multiple routes with the 1:N optical power splitter transmitted to the far end via the optical fiber, respectively by E/G PON ( The remote device of the Ethernet/Gigabit-Capable Passive Optical Network is received by the remote device of the NG PON to provide user services. The uplink transmission signal from the remote device to the central office is separated at the WDM1r, and the uplink transmission signal belonging to the NG PON is transmitted to the Active Splitter component, and the optical circulator in the component transmits the uplink transmission signal and the downlink transmission signal. The transmission path is separated, the uplink transmission signal is amplified by the optical amplifier, and then transmitted to the optical multiplexer, and the uplink transmission signal is transmitted to the ODN optical interface of the NG PON central office device by using the same optical fiber as the downlink transmission signal. deal with.

In summary, the present invention is summarized as follows: an effective introduction of an NG PON (Next Generation Passive Optical Network) network to an existing E PON (Ethernet Passive Optical Network) or G PON (Gigabit-Capable Passive Optical Network) network infrastructure The device comprises: a lightwave multiplexer, which transmits an ODN (Optical Distribution Network) optical interface received from the NG PON to a downlink optical amplifier, and multiplexes the uplink transmission signal to the downlink transmission The signal is transmitted to the ODN optical interface of the NG PON; the downstream optical amplifier is coupled to the optical multiplexer through an optical fiber, and the downstream optical amplifier amplifies the optical signal of the downlink transmission signal sent by the NG PON Intensity; an upstream optical amplifier coupled to the optical multiplexer through an optical fiber, the upstream optical amplifier being amplified and transmitted back to the NG PON The optical signal strength of the line transmission signal; an optical circulator coupled to the downlink amplifier and the upstream optical amplifier through the optical fiber to provide a transmission path different from the downlink transmission signal; and a one-to-multiple optical power The splitter is connected to the optical circulator through an optical fiber, and the one-to-multiple optical power splitter divides a downlink transmission signal into a plurality of downlink transmission signals, and respectively introduces the downlink transmission signals into the existing E PON or G In the infrastructure of the PON, a plurality of uplink transmission signals in the infrastructure of the existing E PON or G PON are superimposed into one uplink transmission signal.

In the present invention, the gain of the light intensity of the downstream optical amplifier for amplifying the downlink transmission signal ranges between 6 and 14 dB.

In the present invention, the downlink optical amplifier amplifies the light intensity of the downlink transmission signal by a range of 6 to 14 dB.

In the present invention, the ODN optical interface of the NG PON has a bandwidth of at least 10 Gb/s or more.

A method for efficiently introducing an NG PON (Next Generation Passive Optical Network) network to an existing E PON (Ethernet Passive Optical Network) or G PON (Gigabit-Capable Passive Optical Network) network infrastructure, comprising the following steps: A lightwave multiplexer receives the signal transmitted from the ODN optical interface of the NG PON and transmits the signal to the next optical amplifier; the optical intensity of the downlink transmission signal is amplified by the downstream optical amplifier, and then transmitted to an optical circulator; The optical circulator provides a transmission path for transmitting the downlink transmission signal to the one-to-multiple optical power splitter; and diverting the downlink transmission signal into a plurality of downlink transmission signals by using the one-to-multiple optical power splitter, and These downlink transmission signals are respectively introduced into the existing infrastructure of E PON or G PON.

A method for efficiently introducing an NG PON (Next Generation Passive Optical Network) network to an existing EPON (Ethernet Passive Optical Network) or G PON (Gigabit-Capable Passive Optical Network) network infrastructure, comprising the following steps: The one-to-multiple optical power splitter superimposes multiple uplink transmission signals from the existing E PON or G PON infrastructure into one uplink transmission signal, and transmits the uplink transmission signal to an optical circulator; The transmission path provided by the device transmits the uplink transmission signal to an upstream optical amplifier; the optical intensity of the uplink transmission signal is amplified by the upstream optical amplifier, and then transmitted to a lightwave multiplexer; and the optical multiplexer is transmitted through the optical multiplexer After receiving the uplink transmission signal after the optical intensity is amplified, the signal is transmitted to the ODN optical interface of the NG PON.

According to the above, the present invention has the following advantages:

(1) The present invention augments the service coverage of the ODN optical interface of the NG PON network device, and is extended to a user who can cover up to 16 ODNs by a user originally covering an existing ODN, for example, 32 users.

(2) The present invention allows the network provider to effectively reduce the construction cost of the NG PON network equipment when the existing E/G PON network users request ultra-high bandwidth services, and co-constructs with the E/G PON network. ODN network, in response to the initial growth of users' demand for ultra-high-bandwidth services.

To sum up, this case is not only innovative in terms of technical thinking, but also has many of the above-mentioned functions that are not in the traditional methods of the past. It has fully complied with the statutory invention patent requirements of novelty and progressiveness, and applied for it according to law. Approved this invention patent application, in order to invent invention, to the sense of virtue.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The present invention will be further described with reference to the accompanying drawings: FIG. 1 is a schematic diagram of a co-structured access network architecture of an apparatus for efficiently importing an NG PON network into an existing E/G PON network infrastructure according to the present invention, /G PON is the main network equipment for the current network operators to build fiber-to-the-home. Each ODN optical interface has a bandwidth of 1Gb/s~2.5Gb/s; NG PON is the next-generation fiber-to-the-home network equipment. An ODN optical interface has a bandwidth of 10 Gb/s or more. Both can utilize the point-to-multipoint architecture of the ODN network to provide multiple user voice, video and data multimedia services, such as 16, 32 or 64 users, via each ODN optical interface. When users in the E/G PON network begin to request ultra-highband services, such as 500Mb/s or 1Gb/s, network operators can choose to provide them by existing E/G PON devices, but this may affect In an ODN network, there are both the user's service quality and the number of users accommodated. When the network provider chooses NG PON equipment to provide users' ultra-high-bandwidth service requirements based on network evolution and service quality considerations, NG PON and E/G PON co-construction in the same ODN network is an inevitable trend to avoid duplication of investment in network infrastructure. The E/G PON central office equipment 1 is an E/G PON signal control processing center; the NG PON central office equipment 2 is an NG PON signal control processing center, and both of them can provide multiple routing ODN optical interfaces. The active optical power splitter 3 of the present invention divides a routing ODN optical interface downlink transmission signal of the NG PON central office device 2 into multiple routes, and respectively transmits signals to each ODN optical interface of the E/G PON in each optical wave. Workers (WDM1r) 4 work together, and then use the fiber to transmit to the far-end 1:N (one-to-many) optical power The splitter 5, 1:N optical power splitter 5 is a passive component that can split a routed fiber optic transmission signal into multiple routes, such as 16, 32 or 64 routes, but will cause the transmitted signal optical power to be very strong. Attenuation, for example 14dB, 17dB or 21dB. Each of the routing fibers is respectively transmitted to the individual E/G PON remote device 6 and the NG PON remote device 7, and the remote device parses the service signal to provide the user broadband service and the ultra-high bandwidth service respectively. After the E/G PON remote device 6 and the NG PON remote device 7 are processed, the uplink transmission signal of the user is transmitted to the central office under the control of the E/G PON central office device 1 and the NG PON central office device 2, respectively. . The uplink transmission signals of the respective routes belonging to the same ODN are superimposed on the 1:N optical power splitter 5, and the uplink transmission signals of the respective ODNs are respectively transmitted to the optical multiplexer (WDM1r) 4, and the optical multiplexer (WDM1r) 4 The uplink transmission signals of the two types of remote devices are separated according to the different wavelengths of the uplink signals of the E/G PON remote device 6 and the NG PON remote device 7, belonging to the E/G PON remote device 6 A type of uplink transmission signal is transmitted to the E/G PON central office device 1 for processing; an uplink transmission signal belonging to the NG PON remote device 7 is transmitted to the NG PON central office device after passing through the active optical power splitter 3 The same ODN optical interface of 2 is received and processed. After the central office device finishes processing the signal, it will continue to transmit to the upper layer network.

Referring to FIG. 2, it is a schematic diagram of an apparatus architecture for effectively importing an NG PON network into an existing E/G PON network infrastructure, and the optical multiplexer 31 provides an ODN optical interface downlink of the NG PON central office equipment 2. The transmit signal and the uplink transmit signal can be transmitted using the same fiber. After the ODN optical interface downlink transmission signal of the NG PON central office device 2 passes through the optical multiplexer 31, it proceeds to the downstream optical amplifier 32 to perform amplification of the transmitted signal light intensity, for example, a gain of 6 to 14 dB, and the transmitted signal whose optical intensity is amplified. After passing through the optical circulator 33, the 1:M (one-to-many) optical power splitter 34 is divided into a plurality of routes, for example, 4 to 16 routes, and transmitted to individual lights. The multiplexer (WDM1r) 4 is multiplexed with each ODN optical interface of the E/G PON. The optical circulator 33 provides that the downlink transmission signal of the NG PON is separated from the transmission path of the uplink transmission signal and transmitted on the optical fiber of different paths. Therefore, after the uplink transmission signals of the NG PON routes are separated in the optical multiplexer (WDM1r) 4, respectively, they are superimposed into a single route via the 1:M optical power splitter 34, and the optical circulator 33 is provided to be different from the downlink transmission signal. The transmission path causes the uplink transmission signal to enter the upstream optical amplifier 35, and the uplink transmission signal strength is moderately amplified, for example, a gain of 6 to 14 dB, and then transmitted to the optical multiplexer 31, and transmitted to the NG by using the same optical fiber as the downlink transmission signal. The ODN optical interface of the PON central office device 2 is received and processed.

In order to understand the operation flow of the apparatus for efficiently introducing the NG PON network to the existing E/G PON network infrastructure of the present invention, the flow chart will be described in conjunction with the following paragraph. Please refer to FIG. 3, which is a flowchart of the operation of the present invention for effectively importing an NG PON network into an existing E/G PON network infrastructure. First, refer to step S11, by using a lightwave multiplexer. Receiving a signal transmitted from the ODN optical interface of the NG PON and transmitting the signal to the next optical amplifier; then, referring to step S12, the optical intensity of the downlink transmission signal is amplified by the downstream optical amplifier, and then transmitted to a light cycle. Then, referring to step S13, the downlink transmission signal is transmitted to the one-to-multiple optical power splitter by using the transmission path provided by the optical circulator; then, referring to step S14, the one-to-multiple optical power divergence is transmitted. The device diverts the downlink transmission signal into a plurality of downlink transmission signals, and introduces the downlink transmission signals into the existing E/G PON infrastructure respectively; then, refer to step S15, and finally through the existing infrastructure, After each disagreement The line transmission signals are sent to the corresponding client devices respectively.

Please refer to FIG. 4 , which is an uplink signal operation flowchart of the method for effectively importing an NG PON network into an existing E/G PON network infrastructure according to the present invention. First, refer to step S21 to pass the existing E/G PON. The infrastructure receives the uplink transmission signal sent by each client device; then, referring to step S22, the plurality of uplink transmission signals in the infrastructure of the existing E PON or G PON are transmitted through a one-to-multiple optical power splitter. Superimposed into an uplink transmission signal, and the uplink transmission signal is transmitted to an optical circulator; then, referring to step S23, using the transmission path provided by the optical circulator, the uplink transmission signal is transmitted to an upstream optical amplifier; Referring to step S24, the uplink optical amplifier amplifies the light intensity of the uplink transmission signal and transmits the light intensity to a lightwave multiplexer. Then, referring to step S25, the light intensity is amplified by the optical multiplexer. After the uplink transmission signal, the signal is transmitted to the ODN optical interface of the NG PON.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; the modifications and equivalents of the present invention are intended to be included in the scope of the present invention without departing from the spirit and scope of the invention. Within the scope of protection.

1‧‧‧E/G PON central office equipment

2‧‧‧NG PON central office equipment

3‧‧‧Active Optical Power Splitter

31‧‧‧Lightwave multiplexer

32‧‧‧ Downstream optical amplifier

33‧‧‧Light Circulator

34‧‧1: M optical power splitter

35‧‧‧Upstream optical amplifier

4‧‧‧Lightwave multiplexer

5‧‧1: N multi-power splitter

6‧‧‧E/G PON remote device

7‧‧‧NG PON remote device

Step S11 to step S15

Step S21 to step S25

1 is a schematic diagram of a co-structured access network architecture of an apparatus for efficiently introducing an NG PON network to an existing E/G PON network infrastructure; FIG. 2 is an effective introduction of the NG PON network to the present invention. Existing E/G PON network infrastructure Schematic diagram of the device architecture; FIG. 3 is a flow chart of the operation of the invention for effectively introducing the NG PON network to the existing E/G PON network infrastructure; FIG. 4 is an effective introduction of the NG PON network according to the present invention. Upstream signal flow diagram of the method of the existing E/G PON network infrastructure;

31‧‧‧Lightwave multiplexer

32‧‧‧ Downstream optical amplifier

33‧‧‧Light Circulator

34‧‧1: M optical power splitter

35‧‧‧Upstream optical amplifier

Claims (6)

An apparatus for efficiently introducing an NG PON (Next Generation Passive Optical Network) network to an existing E PON (Ethernet Passive Optical Network) or G PON (Gigabit-Capable Passive Optical Network) network infrastructure, comprising: a lightwave multiplexing Transmitting the downlink transmission signal from the optical distribution network (ODN) of the NG PON to the downlink optical amplifier, and multiplexing the uplink transmission signal to the same optical fiber as the downlink transmission signal, and transmitting the same to the NG PON The off-line optical amplifier is connected to the optical multiplexer through an optical fiber, and the downstream optical amplifier amplifies the optical signal strength of the downlink transmission signal sent by the NG PON; an upstream optical amplifier transmits the optical fiber through The optical multiplexer is coupled to the optical amplifier for amplifying the optical signal strength of the upstream transmission signal of the NG PON; and an optical circulator is coupled to the downstream amplifier and the upstream optical amplifier through an optical fiber. a transmission path different from the downlink transmission signal; and a one-to-many optical power splitter The fiber is coupled to the optical circulator, and the one-to-multiple optical power splitter divides a downlink transmission signal into a plurality of downlink transmission signals, and respectively introduces the downlink transmission signals into an existing E PON or G PON infrastructure. And superimposing a plurality of uplink transmission signals in the infrastructure of the existing E PON or G PON into one uplink transmission signal. The apparatus for efficiently introducing an NG PON network into an existing E/G PON network infrastructure as described in claim 1, wherein the upstream optical amplifier amplifies the light intensity of the downlink transmission signal by a range of 6 to 14 dB. between. The apparatus for efficiently introducing an NG PON network into an existing E/G PON network infrastructure as described in claim 1, wherein the downlink optical amplifier amplifies the light intensity of the downlink transmission signal by a range of 6 to 14 dB. between. The apparatus for efficiently importing an NG PON network into an existing E/G PON network infrastructure as described in claim 1 wherein the ODN optical interface of the NG PON has a bandwidth of at least 10 Gb/s. A method for efficiently introducing an NG PON (Next Generation Passive Optical Network) network to an existing E PON (Ethernet Passive Optical Network) or G PON (Gigabit-Capable Passive Optical Network) network infrastructure, comprising the following steps: A lightwave multiplexer receives the signal transmitted from the ODN optical interface of the NG PON and transmits the signal to the next optical amplifier; the optical intensity of the downlink transmission signal is amplified by the downstream optical amplifier, and then transmitted to an optical circulator; The optical circulator provides a transmission path for transmitting the downlink transmission signal to the one-to-multiple optical power splitter; and diverting the downlink transmission signal into a plurality of downlink transmission signals by using the one-to-multiple optical power splitter, and These downlink transmission signals are respectively introduced into the existing infrastructure of E PON or G PON. A method for efficiently introducing an NG PON (Next Generation Passive Optical Network) network to an existing E PON (Ethernet Passive Optical Network) or G PON (Gigabit-Capable Passive Optical Network) network infrastructure, including The following steps: superimposing a plurality of uplink transmission signals from an existing E PON or G PON infrastructure into an uplink transmission signal through a one-to-multiple optical power splitter, and transmitting the uplink transmission signal to an optical circulator Transmitting the uplink transmission signal to an upstream optical amplifier by using the transmission path provided by the optical circulator; amplifying the optical intensity of the uplink transmission signal by the upstream optical amplifier, transmitting the optical signal to a lightwave multiplexer; The optical multiplexer receives the uplink transmission signal after the optical intensity is amplified, and then transmits the signal to the ODN optical interface of the NG PON.