CN113258994B - Host computer, optical module and optical fiber access network equipment - Google Patents
Host computer, optical module and optical fiber access network equipment Download PDFInfo
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- CN113258994B CN113258994B CN202010088082.5A CN202010088082A CN113258994B CN 113258994 B CN113258994 B CN 113258994B CN 202010088082 A CN202010088082 A CN 202010088082A CN 113258994 B CN113258994 B CN 113258994B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/038—Arrangements for fault recovery using bypasses
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
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Abstract
The embodiment of the invention discloses an upper computer, an optical module and optical fiber access network equipment, wherein the upper computer comprises a circuit board, and the circuit board comprises a feedback unit and a feedback unit, wherein the feedback unit is used for outputting a feedback signal according to an SD signal output by the optical module; one end of the control unit is connected with the feedback unit and used for outputting a control signal according to the feedback signal; the other end of the optical fiber is connected with the multi-path optical switch and used for controlling the multi-path optical switch to select one working optical fiber from the plurality of optical fibers according to the control signal so as to receive the optical signal transmitted by the user terminal network structure. When the working optical fiber fails, the optical module cannot receive the optical signal, the optical module continuously outputs a low-level SD signal for a period of time, the upper computer can timely output a feedback signal according to the low-level SD signal, timely outputs a control signal according to the feedback signal, and controls the multi-path optical switch to select a new working optical fiber from the plurality of optical fibers according to the control signal to replace the failed working optical fiber, so that normal application of services is ensured.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical fiber communication, in particular to an upper computer, an optical module and optical fiber access network equipment.
Background
FTTX (fiber to the X) is a new generation of fiber subscriber access network for connecting communication carriers and end users.
The working process of the traditional FTTX network equipment comprises the following steps: an OLT (Optical Line Terminal) reaches a user end through a long-distance Optical fiber, and the user end uses an Optical splitter to perform service switching on a plurality of ONUs (Optical network units), respectively.
The condition that outdoor light is accidentally damaged and broken due to construction of other units easily occurs in daily life. After the light is broken, the transmission of the optical signal between the optical fiber terminal and the user terminal is interrupted, so that all users under the optical fiber line cannot use the service normally. Because the optical fiber distance is very long, after the optical fiber is dug, an operator needs to find out where the optical fiber is dug, and then arrange corresponding staff to the site for maintenance. In this period, the user cannot use the service normally, which affects normal life and work.
Disclosure of Invention
The embodiment of the invention provides an upper computer, an optical module and optical network access equipment, which can realize that a user can normally use services after an optical fiber is dug and broken.
An upper computer, comprising:
a circuit board, comprising:
the feedback unit is used for outputting a feedback signal according to the SD signal output by the optical module;
one end of the control unit is connected with the feedback unit and used for outputting a control signal according to the feedback signal; the other end of the optical fiber is connected with the multi-path optical switch and used for controlling the multi-path optical switch to select one optical fiber from the plurality of optical fibers as a working optical fiber according to the control signal, wherein the working optical fiber is used for receiving optical signals transmitted by the user terminal network structure.
Has the advantages that: the embodiment of the invention provides an upper computer which comprises a feedback unit and a control unit, wherein the feedback unit is connected with an optical module, the feedback unit is connected with the control unit, and the control unit is connected with a multi-path optical switch. The feedback unit outputs a feedback signal according to the SD signal output by the optical module. The control unit outputs a control signal according to the feedback signal output by the feedback unit, and then controls the multi-path optical switch to select one optical fiber from the optical fibers as a working optical fiber according to the control signal, wherein the working optical fiber is used for receiving an optical signal transmitted by the user terminal network structure. When the working optical fiber fails, the optical module cannot receive the optical signal, the optical module continuously outputs a low-level SD signal for a period of time, the upper computer can timely output a feedback signal according to the low-level SD signal, timely outputs a control signal according to the feedback signal, and controls the multi-path optical switch to select one optical fiber from the remaining optical fibers as the working optical fiber according to the control signal to replace the failed working optical fiber, so that normal application of the service is ensured.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without any inventive exercise.
Fig. 1 is a schematic structural diagram of an optical fiber access network device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a network structure of a user terminal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present invention;
fig. 4 is an exploded structural diagram of an optical module according to an embodiment of the present invention;
FIG. 5 is a top view of a circuit board provided by an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an upper computer of an optical module according to an embodiment of the present invention;
fig. 7 is a schematic partial structure diagram in an upper computer according to an embodiment of the present invention;
fig. 8 is a cross-sectional view of a connection structure between an optical module and an optical module interface according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an electrical connector in an optical module interface according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of an optical module golden finger structure according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a circuit board of an upper computer according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a feedback unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer, it is necessary to perform interconversion between the electric signal and the optical signal.
The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.
Fig. 1 is a schematic structural diagram of an optical fiber access network device according to an embodiment of the present invention, and fig. 2 is a schematic structural diagram of a user-side network structure according to an embodiment of the present invention. As shown in fig. 1 and 2, an optical fiber access network device includes a customer premises network structure 100, a plurality of optical fibers 200, a multi-way optical switch 300, an optical module 400, and an upper computer 500.
Since the upper computer 500 may be the ONU101 or the OLT, the optical module 400 may be the ONU101 optical module or the OLT optical module. When the upper computer 500 is the OLT, the optical module 400 is an OLT optical module; when the upper computer 500 is the ONU101, the optical module 400 is an ONU101 optical module. In the embodiment of the present invention, the upper computer 500 is an OLT, and the optical module 400 is an OLT optical module.
The optical signal interaction can be performed between the upper computer 500 and the user side network structure 100, and the optical signal transmission between the upper computer 500 and the user side network structure 100 includes signal transmission in a first direction and signal transmission in a second direction. The signal transmission in the first direction means that a signal sent by the upper computer is transmitted to a user side network structure, namely, downlink signal transmission. The signal transmission in the second direction means that signals sent by the user side network structure are transmitted to an upper computer, namely uplink signal transmission.
In order to realize downlink signal transmission, when the system is registered, the upper computer 500 controls the multi-path optical switch 300 to select one optical fiber from the plurality of optical fibers 200 as a working optical fiber. The upper computer 500 outputs an electrical signal, the electrical signal is converted into an optical signal through the optical module 400, and the optical signal is transmitted to the user side network structure 100 through the multi-path optical switch 300 and the working optical fiber.
In order to realize uplink signal transmission, the user-side network structure 100 outputs optical signals, the optical signals are transmitted to the optical module 400 through the optical fibers 200 and the multi-path optical switch 300, the optical module 400 converts the optical signals into electrical signals, and the upper computer 500 controls the multi-path optical switch 300 according to the electrical signals to select one optical fiber from the optical fibers 200 as a working optical fiber. The electrical signal is an SD signal.
The subscriber-side network structure 100 is used for outputting optical signals. Specifically, the customer premises network structure 100 includes a plurality of ONUs 101 and an optical splitter 102, and the optical splitter 102 includes a first optical splitter and a second optical splitter. The ONUs 101 are connected to one end of a first optical splitter, the other end of the first optical splitter is connected to one end of a second optical splitter, and the other end of the second optical splitter is connected to the optical fibers 200. The ONUs 101 are configured to sequentially output optical signals, the optical splitter 102 is configured to split the optical signals into multiple paths of the same optical signals, the first optical splitter is configured to split the optical signals output by the optical module 400 into multiple paths of the same optical signals, and the second optical splitter is configured to replicate the optical signals output by the ONUs 101 into multiple paths of the same optical signals.
To realize downlink signal transmission: one path of optical signal output by the optical module 400 is transmitted to the second optical splitter and the first optical splitter through one working optical fiber, the first optical splitter replicates the one path of optical signal into the same multiple paths of optical signals, and transmits the multiple paths of optical signals to each ONU101, and each ONU101 outputs an optical signal according to the received optical signal as a response.
To realize uplink signal transmission: in a period set by the user-side network structure 100, the ONUs 101 sequentially output optical signals, one optical signal is transmitted to the second optical splitter through the first optical splitter, the second optical splitter multiplexes one optical signal into the same multiple optical signals, and each optical signal is transmitted along each optical fiber.
The second beam splitter includes a 1-to-2 beam splitter, a 1-to-4 beam splitter, and the like. When the second optical splitter is a 1-in-2 optical splitter and the transmission is performed in the second direction, the 1-in-2 optical splitter duplicates one optical signal into two identical optical signals. When the second optical splitter is a 1-to-4 optical splitter and the transmission is performed in the second direction, the 1-to-4 optical splitter multiplexes one optical signal into the same four optical signals.
The plurality of optical fibers 200 are connected to the subscriber side network structure 100 at one end and to the multi-channel optical switch 300 at the other end. A plurality of optical fibers 200 are used to transmit the optical signals output by the customer premises network structure 100. Specifically, one end of each of the optical fibers 200 is connected to the subscriber-side network structure 100, and the other end of each of the optical fibers 200 is connected to one end of the multi-path optical switch 300. Each fiber of the multi-path optical switch 300 can be used as both a working fiber and a backup fiber. When one of the plurality of optical fibers 200 is a working optical fiber, the remaining optical fibers are backup optical fibers.
To realize downlink signal transmission: one optical signal output by the optical module 400 is transmitted to the user-side network structure 100 through one working optical fiber of the optical fibers 200.
To realize uplink signal transmission: multiple paths of identical optical signals output by the customer premise network structure 100 are transmitted to the multiple paths of optical switches 300 through the multiple optical fibers 200, where each optical fiber transmits one optical signal.
Since each optical fiber optical signal transmits one optical signal, when the second optical splitter 102 is a 1-to-2 optical splitter 102, the plurality of optical fibers 200 connected to the second optical splitter 102 are 2 optical fibers. One of the 2 optical fibers is a working optical fiber, and the other optical fiber is a backup optical fiber. When the second splitter 102 is a 1-to-4 splitter 102, the plurality of optical fibers 200 connected to the second splitter 102 are 4 optical fibers. One of the 4 optical fibers is a working optical fiber, and the other three optical fibers are backup optical fibers.
The multi-channel optical switch 300 has one end connected to the plurality of optical fibers 200, the other end connected to the optical module 400 through an optical fiber, and the other end connected to the upper computer 500 through a network cable. The multi-channel optical switch 300 is configured to select one optical fiber from the plurality of optical fibers 200 as a working optical fiber according to a control signal of the upper computer 500. In particular, the method comprises the following steps of,
to realize downlink signal transmission: when the system is registered, the upper computer 500 sends a randomly selected control signal, and transmits the control signal to the multi-channel optical switch 300. According to the control signal, the multi-channel optical switch 300 randomly selects one optical fiber from the plurality of optical fibers 200 connected thereto as a working optical fiber, and the remaining optical fibers are used as backup optical fibers.
To realize uplink signal transmission: according to the control signal of the upper computer 500, the multi-path optical switch 300 selects one optical fiber from the plurality of optical fibers 200 connected with the multi-path optical switch as a working optical fiber. When the working optical fiber is normal, the control signal output by the upper computer 500 is the control signal that keeps the current status, and the multi-channel optical switch 300 selects one working optical fiber from the plurality of optical fibers 200, where the working optical fiber is the original working optical fiber, that is, the backup optical fiber does not need to be switched. When the working optical fiber is abnormal, the control signal output by the upper computer 500 is the switching control signal, and one optical fiber selected from the plurality of optical fibers 200 by the multi-path optical switch 300 is the working optical fiber, which is any one of the backup optical fibers except the original working optical fiber.
The optical fibers 200 can transmit the optical signals output by the subscriber end network structure 100 to the multi-channel optical switch 300, but the multi-channel optical switch 300 only selectively transmits the optical signals of the working optical fibers to the optical module 400, and the optical signals transmitted by the remaining optical fibers 200 are not transmitted to the optical module 400.
One end of the optical module 400 is connected to the multi-path optical switch 300 through an optical fiber, and the other end is electrically connected to the upper computer 500. The optical module is configured to receive the optical signal received by the multi-channel optical switch 300, and output a corresponding SD signal according to whether the optical signal is received. Specifically, the optical module 400 receives the optical signal received by the multi-path optical switch 300. When receiving the optical signal, the optical signal is converted into an electrical signal, and the optical module 400 outputs a first SD signal. When the optical signal is not received, the optical signal is converted into an electrical signal, and the optical module 400 outputs a second SD signal. The first SD signal is a high-level SD signal, and the second SD signal is a low-level SD signal. For example, although the plurality of ONUs 101 sequentially output optical signals, the optical module 400 outputs the second SD signal when there is no gap between the optical signals output by the two ONUs 101 and the optical signal is not received by the optical module 400.
The optical module in the optical fiber access network device is further described below.
Fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present invention, and fig. 4 is an exploded structural diagram of an optical module according to an embodiment of the present invention. As shown in fig. 3 and 4, an optical module 400 provided by an embodiment of the present invention includes an upper housing 401, a lower housing 402, an unlocking member 403, a circuit board 404, a light emitting device 405, and a light receiving device 406.
The upper shell 401 is covered on the lower shell 402 to form a wrapping cavity with two openings; the outer contour of the package cavity generally presents a square shape, and specifically, the lower housing 402 includes a main plate and two side plates located at two sides of the main plate and arranged perpendicular to the main plate; the upper shell 401 comprises a cover plate, and the cover plate covers two side plates of the upper shell 401 to form a wrapping cavity; the upper housing 401 may further include two side walls disposed at two sides of the cover plate and perpendicular to the cover plate, and the two side walls are combined with the two side plates to cover the upper housing 401 on the lower housing 402.
The two openings can be two ends opening in the same direction, or two openings in different directions; one of the openings is an electrical port, and a gold finger of the circuit board 404 extends out of the electrical port and is inserted into an upper computer 500 such as an optical network terminal; the other opening is an optical port for external optical fiber access to connect with the optical receiving device 406 inside the optical module 400; optoelectronic devices such as circuit board 404 and light receiving device 406 are located in the package cavity.
The assembly mode of combining the upper shell 401 and the lower shell 402 is adopted, so that the circuit board 404, the light receiving device 406 and other devices can be conveniently installed in the shells, and the upper shell 401 and the lower shell 402 form an outermost packaging protection shell of the optical module 400; the upper shell 401 and the lower shell 402 are generally made of metal materials, which is beneficial to realizing electromagnetic shielding and heat dissipation; generally, the housing of the optical module 400 is not formed as an integral component, and thus, when devices such as the circuit board 404 are mounted, the positioning member, the heat dissipation member, and the electromagnetic shielding member cannot be mounted, which is not favorable for automation of production.
The unlocking member 403 is located on an outer wall of the package cavity/lower housing 402, and is used to realize a fixed connection between the optical module 400 and the upper computer 500, or release the fixed connection between the optical module 400 and the upper computer 500.
The unlocking member 403 has an engaging member that fits the cage of the upper computer 500; the end of the pulling unlocking member 403 can make the unlocking member 403 move relatively on the surface of the outer wall; the optical module 400 is inserted into the cage of the host computer 500, and the optical module 400 is fixed in the cage of the host computer 500 by the engaging member of the unlocking member 403; by pulling the unlocking member 403, the engaging member of the unlocking member 403 moves along with it, and the connection relationship between the engaging member and the host computer 500 is changed to release the engagement relationship between the optical module 400 and the host computer 500, so that the optical module 400 can be pulled out from the cage of the host computer 500.
The circuit board 404 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as an MCU, a laser driver chip, a limiting amplifier chip, a clock data recovery CDR, a power management chip, and a data processing chip DSP).
The circuit board 404 connects the electrical devices in the optical module 400 together according to circuit design through circuit routing to implement electrical functions such as power supply, electrical signal transmission, grounding, and the like.
The circuit board 404 is generally a rigid circuit board, which can also perform a bearing function due to its relatively hard material, for example, the rigid circuit board can stably bear a chip; the rigid circuit board may also provide a smooth bearing when the light receiving device 406 is located on the circuit board 404; the hard circuit board can also be inserted into an electric connector in the cage of the upper computer 500, and specifically, a metal pin/gold finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.
A flexible circuit board is also used in part of the optical module 400 as a supplement to the rigid circuit board; the flexible circuit board is generally used in combination with a rigid circuit board, and for example, a flexible circuit board may be used to connect the rigid circuit board and the light receiving device 406.
The light emitting device 405 may be disposed on the circuit board 404, or disposed at one end of the circuit board 404, and is connected to the circuit board 404 by wire bonding. The light emitting device 405 is used to transmit an optical signal, specifically, convert an electrical signal of an upper computer into an optical signal, and transmit the optical signal to an optical fiber.
The light receiving device 406 may be disposed on the circuit board 404, or disposed at one end of the circuit board 404, and is connected to the circuit board 404 by wire bonding. The optical transceiver 406 is used for receiving optical signals, specifically, converting optical signals transmitted by optical fibers into electrical signals, and transmitting the electrical signals to an upper computer.
The light emitting devices in the light module are further described below.
Fig. 5 is a top view of a circuit board according to an embodiment of the invention. As shown in fig. 5, the light emitting device 405 and the light receiving device 406 are disposed at one end of the circuit board 404 and are connected to the circuit board 404 by wire bonding, the light receiving device 406 includes a light receiving chip, and the circuit board 404 includes a trans-group amplifier chip 4041 and a limited sub-amplifier chip 4042.
And a light receiving chip provided inside the light receiving device 406. One end of the light receiving chip is connected with the optical fiber, and the other end of the light receiving chip is connected with the trans-group amplifier chip 4041 in a routing way. The optical receiving chip is used for receiving the optical signal transmitted by the optical fiber. Specifically, when the light receiving chip receives the optical signal of the multi-path optical switch 300, the optical module 400 outputs a first SD signal; when the light receiving chip does not receive the optical signal of the multi-channel optical switch 300, the optical module 400 outputs a second SD signal. When the light receiving chip receives the light signal, the light receiving chip converts the light signal into an electrical signal, and the electrical signal is a voltage signal.
The trans-group amplifier chip 4041 is disposed on the circuit board 404 and connected to the circuit board 40 by wire bonding. One end of the trans-group amplifier chip 4041 is connected to the light receiving chip by wire bonding, and the other end is connected to the secondary limiting amplifier chip 4042 by wire bonding. The trans-group amplifier chip 4041 is configured to amplify the voltage signal to obtain an SD signal, which is the amplified voltage signal.
And the auxiliary limiting amplifying chip 4042 is arranged on the circuit board 404 and is connected with the circuit board 40 in a routing way. The limited sub amplification chip 4042 has one end connected to the transgroup amplifier chip 4041 by wire bonding and the other end electrically connected to the upper computer. The limiting and amplifying chip 4042 is configured to compare the threshold condition parameter set in the limiting and amplifying chip 4042 with the SD signal, and output the first SD signal or the second SD signal. The first SD signal is a low-level SD signal, and the second SD signal is a high-level SD signal. When the amplified electric signal is larger than the threshold condition parameter, outputting a first SD signal; and when the amplified electric signal is smaller than the threshold condition parameter, outputting a second SD signal.
The light receiving device 406 is connected to the multi-channel optical switch 300 through an optical fiber. Specifically, the optical receiving device 406 may receive the optical signal received by the multi-path optical switch 300 through an optical fiber, and may also transmit the emitted optical signal to the multi-path optical switch 300 through an optical fiber.
And one end of the upper computer 500 is electrically connected with the optical module 400, and the other end of the upper computer is connected with the multi-path optical switch 300 through a network cable. The upper computer 500 is used for controlling the multi-path optical switch 300 according to the electric signal to select one optical fiber from the plurality of optical fibers 200 as a working optical fiber. The electrical signal is an SD signal.
The upper computer of the optical module in the optical fiber access network device is further explained below.
Fig. 6 is a schematic structural diagram of an upper computer of an optical module according to an embodiment of the present invention, and fig. 7 is a schematic structural diagram of a part of the upper computer according to the embodiment of the present invention. As shown in fig. 6 and 7, the upper computer 500 includes an upper cover 501, a lower cover 502, a circuit board 503 and the optical module 400, the upper cover 501 and the lower cover 502 form a cavity for wrapping the circuit board 503 and the optical module 400, and the circuit board 503 has an optical module interface 504 and a cable interface 505.
The optical module interface 504 is used for accessing the optical module 400, and an electrical connector 5041 is arranged in the optical module interface 504 and used for accessing an electrical port of the optical module 400 such as a golden finger and the like, so that a bidirectional electrical signal connection is established with the optical module 400; the network cable interface 505 is used for accessing a network cable and establishing bidirectional electrical signal connection with the network cable; the optical module 400 is connected to the network cable through the upper computer 500, specifically, the upper computer 500 transmits a signal from the optical module 400 to the network cable and transmits a signal from the network cable to the optical module 400, and the upper computer 500 monitors the operation of the optical module 400.
The optical port of the optical module 400 is connected to an optical fiber, and establishes a bidirectional optical signal connection with the optical fiber; the electrical port of the optical module 400 is connected to the upper computer 500, and establishes bidirectional electrical signal connection with the optical network unit; the optical module 400 realizes the interconversion between the optical signal and the electrical signal, thereby realizing the connection between the optical fiber and the upper computer 500; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module 400 and then input to the host computer 500, and the electrical signal from the host computer 500 is converted into an optical signal by the optical module 400 and input to the optical fiber.
Fig. 8 is a cross-sectional view of a connection structure between an optical module and an optical module interface according to an embodiment of the present invention, fig. 9 is a schematic structural view of an electrical connector in the optical module interface according to the embodiment of the present invention, and fig. 10 is a schematic structural view of a golden finger of the optical module according to the embodiment of the present invention. As shown in fig. 8, 9, and 10, the end of the circuit board 404 of the optical module 400 is inserted into the optical module interface 504 of the upper computer 500, so that the optical module 400 and the upper computer 500 are electrically connected to each other. Specifically, the optical module interface 504 has an electrical connector 5041, the electrical connector 5041 has a gap for accommodating the circuit board 404 of the optical module 400 and a spring 5042 pressed on the surface of the circuit board 404 of the optical module 400, the surface of the end of the circuit board 404 of the optical module 400 has a metal pin-shaped gold finger 4041, and the spring in the electrical connector 5041 is in contact with the gold finger 4041 to achieve electrical conduction.
Fig. 11 is a schematic structural diagram of a circuit board of an upper computer according to an embodiment of the present invention, and as shown in fig. 11, a circuit board 503 of an upper computer 500 according to an embodiment of the present invention includes a feedback unit and a control unit.
The feedback unit may be disposed on the surface of the circuit board 503 of the upper computer 500, or may be disposed inside the circuit board 503 of the upper computer 500. And a feedback unit having one end electrically connected to the optical module 400 and the other end electrically connected to one end of the control unit. The feedback unit is configured to output a feedback signal according to the SD signal output by the optical module 400. Specifically, one end of the feedback unit is electrically connected to an interface of the optical module 400 on the circuit board 503 of the upper computer 500, and the interface of the optical module 400 is electrically connected to the optical module 400. The SD signal output by the optical module 400 enters the feedback unit through the optical module 400 interface, and the feedback unit outputs a corresponding feedback signal according to the received SD signal. When the SD signal is converted between the first SD signal and the second SD signal, and the time difference of the conversion is within a preset time, the feedback unit outputs a first feedback signal, which may be a high signal or a low signal. The preset time is a reference time set in the feedback unit. When the SD signal is converted between the first SD signal and the second SD signal, and the time difference of the conversion exceeds the preset time, the feedback unit outputs a second feedback signal, which may be a high signal or a low signal. For example, when the SD signal is converted from the first SD signal to the second SD signal and is not converted from the second SD signal to the first SD signal, the feedback unit outputs the second feedback signal. When the first feedback signal is a high signal, the second feedback signal is a low signal; when the first feedback signal is a low signal, the second feedback signal is a high signal.
The control unit may be disposed on the surface of the circuit board 503 of the upper computer 500, or may be disposed inside the circuit board 503 of the upper computer 500. And a control unit having one end electrically connected to the feedback unit and the other end connected to the multi-channel optical switch 300 through a network cable inserted into the network cable interface. The control unit is used for outputting a control signal according to the feedback signal and controlling the multi-path optical switch to select one optical fiber from the optical fibers as a working optical fiber according to the control signal. Specifically, the control unit receives a feedback signal output by the feedback unit, and the feedback signal enters the multi-channel optical switch 300 along with the network cable inserted into the network cable interface. When the feedback signal is a second feedback signal and the output time of the second feedback signal is greater than the reference time, the control unit outputs a control signal keeping the current status. At the moment, the working optical fiber is normal, and the backup optical fiber does not need to be switched to be used as the working optical fiber. The control unit outputs a control signal for switching when the feedback signal is from the second feedback signal to the first feedback signal within the reference time. At this time, the working optical fiber is abnormal, and the backup optical fiber needs to be switched to be used as the working optical fiber. When the working optical fiber is abnormal, the upper computer 500 may output a corresponding control signal according to the feedback signal, and switch the multi-path optical switch 300 to the spare optical fiber as the working optical fiber in time according to the control signal, and resume the service.
Fig. 12 is a schematic structural diagram of a feedback unit according to an embodiment of the present invention, and as shown in fig. 12, in an embodiment of the present invention, the feedback unit includes a first flip-flop, a second flip-flop, a timer, a reference clock circuit, and a comparison circuit.
The first trigger may be disposed on a surface of or inside the circuit board 503 of the upper computer 500. And one end of the first sealing trigger is electrically connected with the optical module, and the other end of the first sealing trigger is electrically connected with the timer. The first flip-flop is configured to output a trigger signal when a signal output by the optical module 400 is converted from a first SD signal to a second SD signal. Specifically, the SD signal is converted from the first SD signal to the second SD signal in the process from the reception of the optical signal to the non-reception of the optical signal in the optical module 400. When the SD signal is converted from the first SD signal to the second SD signal, the first trigger is triggered to output a trigger signal, and the trigger signal triggers the timer to start timing.
And the second trigger can be arranged on the surface of or in the circuit board 503 of the upper computer 500. And one end of the second trigger is electrically connected with the optical module, and the other end of the second trigger is electrically connected with the timer. The second flip-flop is configured to output a reset signal when the signal output by the optical module 400 is converted from the second SD signal to the first SD signal. Specifically, the SD signal is converted from the second SD signal to the first SD signal in the process from the time when the optical module 400 receives no optical signal to the time when the optical signal is received. And when the SD signal is converted into the first SD signal from the second SD signal, triggering the second trigger to output a reset signal, and starting resetting the timer.
The timer can be arranged on the surface of or inside the circuit board 503 of the upper computer 500. And one end of the timer is connected with the first trigger and the second trigger, and the other end of the timer is connected with the comparison circuit. The timer is used for starting timing after receiving the trigger signal and resetting after receiving the reset signal. Specifically, the timer starts timing when receiving a trigger signal; after receiving the reset signal, the reset is started. The timer obtains a timing time from the start of counting to the reset.
The reference clock circuit may be disposed on the surface of or inside the circuit board 503 of the upper computer 500. The reference clock circuit is electrically connected with the timer. The reference clock circuit is used for setting a reference time for the comparison circuit. For example, the reference clock circuit may set the reference time to 2 seconds.
The comparison circuit may be disposed on the surface of or inside the circuit board 503 of the upper computer 500. And one end of the comparison circuit is electrically connected with the reference clock circuit and the timer, and the other end of the comparison circuit is electrically connected with the control unit. The comparison circuit is used for outputting a feedback signal according to the timing time of the timer and the reference time set by the reference clock circuit. Specifically, when the timing time of the timer is greater than the reference time of the reference clock circuit, the first feedback signal is output. And when the timing time of the timer is less than the reference time of the reference clock circuit, outputting a second feedback signal. For example, when the reference time is set to be 2 seconds, the feedback unit outputs a first feedback signal after the timing time of the timer exceeds 2 seconds; when the timing time of the timer does not exceed 2 seconds, the feedback unit outputs a second feedback signal.
When the working optical fiber works normally, the optical module 400 receives the optical signal at intervals, the SD signal changes continuously between the first SD signal and the second SD signal, and the longest period does not exceed 125 microseconds, so that the feedback signal is always the second feedback signal. When the working optical fiber is abnormal, the optical module 400 does not receive the optical signal all the time, the SD signal is converted from the first SD signal to the second SD signal, and is not converted from the second SD signal to the first SD signal, and after 2 seconds, the feedback unit outputs the first feedback signal.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A host computer, comprising:
a circuit board, comprising:
the feedback unit is used for outputting a feedback signal according to the SD signal output by the optical module;
the feedback unit includes:
the optical module comprises a first trigger, a second trigger and a controller, wherein the first trigger is connected with the optical module and is used for outputting a trigger signal when a signal output by the optical module is converted from a first SD signal into a second SD signal, the first SD signal is a high-level SD signal, and the second SD signal is a low-level SD signal;
the second trigger is connected with the optical module and used for outputting a reset signal when the signal output by the optical module is converted from a second SD signal to a first SD signal;
the timer is connected with the first trigger and the second trigger and is used for starting timing after receiving the trigger signal and resetting after receiving the reset signal;
the comparison circuit is connected with the timer and the reference clock circuit and is used for outputting a feedback signal according to the comparison between the timing time of the timer and the reference time set by the reference clock circuit;
one end of the control unit is connected with the feedback unit and used for outputting a control signal according to the feedback signal; and the other end of the optical fiber is connected with a multi-path optical switch and used for controlling the multi-path optical switch to select one optical fiber from a plurality of optical fibers as a working optical fiber according to the control signal, wherein the working optical fiber is used for receiving an optical signal transmitted by a user side network structure.
2. The upper computer of claim 1, wherein the comparison circuit is configured to:
when the timing time of the timer is greater than the reference time of the reference clock circuit, outputting a first feedback signal;
and when the timing time of the timer is less than the reference time of the reference clock circuit, outputting a second feedback signal.
3. The upper computer of claim 1, wherein the control unit is configured to:
the feedback signal is a second feedback signal, and when the output time of the second feedback signal is longer than the reference time, the control unit outputs a control signal for keeping the current status;
and when the feedback signal is changed from the second feedback signal to the first feedback signal in the reference time, the control unit outputs a switching control signal.
4. A fiber optic access network device, comprising:
a user terminal network structure for outputting optical signals;
a plurality of optical fibers connected to the subscriber side network structure for transmitting the optical signals;
one end of the multi-path optical switch is connected with the optical fibers and used for selecting one optical fiber from the optical fibers as a working optical fiber according to a control signal output by an upper computer;
the optical module is connected with the multi-path optical switch and used for receiving the optical signals received by the multi-path optical switch so as to output a first SD signal or a second SD signal;
an upper computer connected with the optical module, the upper computer according to any one of claims 1 to 3.
5. The network device of claim 4, wherein the customer premises network structure comprises:
a plurality of ONUs for outputting optical signals in sequence;
and the optical splitter is connected with the plurality of ONUs and is used for splitting the optical signals into multiple paths of same optical signals.
6. The network device of claim 5, wherein the optical splitter comprises:
the first optical splitter is connected with the ONUs and used for splitting optical signals output by the optical module into multiple paths of same optical signals;
and the second optical splitter is connected with the first optical splitter and used for duplicating the optical signals output by the ONU into two paths of same optical signals.
7. The network device of claim 6, wherein the second optical splitter comprises a 1-in-2 optical splitter.
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