CN114966997B - Optical module and received light power monitoring method - Google Patents
Optical module and received light power monitoring method Download PDFInfo
- Publication number
- CN114966997B CN114966997B CN202110192114.0A CN202110192114A CN114966997B CN 114966997 B CN114966997 B CN 114966997B CN 202110192114 A CN202110192114 A CN 202110192114A CN 114966997 B CN114966997 B CN 114966997B
- Authority
- CN
- China
- Prior art keywords
- optical
- attenuator
- optical attenuator
- power
- working current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4286—Optical modules with optical power monitoring
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
- G02B6/4206—Optical features
-
- 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
- H04B10/40—Transceivers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
In the optical module provided by the application, a silicon optical chip comprises: an optical attenuator transmitting signal light inputted from an external optical fiber to the photodetector; a photodetector which receives the signal light passing through the attenuator and outputs a photocurrent; the optical module further includes: the input end of the transimpedance amplifier is connected with the silicon optical chip, receives the photocurrent and outputs detection current through the detection current output end; the input end of the sampling circuit is connected with the detection current output end, and the detection current is converted into detection voltage and is output through the output end; the current output end of the attenuation controller is connected with the optical attenuator, and current is applied to the optical attenuator so that the optical attenuator can adjust the optical power transmitted to the photoelectric detection signal light; and the MCU is used for receiving the detection voltage at the input end and outputting a control signal according to the detection voltage so as to control the attenuation controller to adjust the current applied to the optical attenuator. The optical module provided by the embodiment of the application enables the photoelectric detector to receive the signal light with proper optical power and can accurately generate the optical power received by the optical module.
Description
Technical Field
The present application relates to the field of optical fiber communications technologies, and in particular, to an optical module and a received light power monitoring method.
Background
With the development of new business and application modes such as cloud computing, mobile internet, video and the like, the development and progress of optical communication technology become more and more important. In the optical communication technology, the optical module is a tool for realizing the mutual conversion of photoelectric signals, and is one of key devices in optical communication equipment. Along with the rapid development of the 5G network, the optical module at the optical communication core position is developed in a long-term way, various optical modules are generated, and the transmission rate of the optical module is continuously improved.
Regardless of the change in the structural form of the optical module and the increase in the transmission rate, the main components that accomplish the photoelectric conversion generally include photodetectors. The optical power of the signal light received by the photoelectric detector has a certain range limit, if the optical power is too high, the photoelectric detector is possibly damaged or the conversion quality of the signal light received by the photoelectric detector is deteriorated, such as the increase of the error rate.
Disclosure of Invention
The embodiment of the application provides an optical module and a received light power monitoring method, so that a photoelectric detector can receive signal light with proper light power and can obtain accurate received light power of the optical module.
In a first aspect, an optical module provided by an embodiment of the present application includes:
a circuit board;
the silicon optical chip is electrically connected with the circuit board and is used for receiving signal light input by an external optical fiber and outputting photocurrent;
wherein, the silicon photochip includes: an optical attenuator and a photodetector;
the output end of the optical attenuator is connected with the photoelectric detector, and the signal light input by the external optical fiber is transmitted to the photoelectric detector;
the photoelectric detector receives the signal light passing through the attenuator and outputs photocurrent;
the optical module further comprises:
the transimpedance amplifier is electrically connected with the circuit board, and the input end of the transimpedance amplifier is connected with the silicon optical chip and is used for receiving the photocurrent and outputting detection current through the detection current output end;
the input end of the sampling circuit is connected with the detection current output end and is used for converting the detection current into detection voltage and outputting the detection voltage through the output end;
the current output end of the attenuation controller is connected with the optical attenuator and is used for applying current to the optical attenuator so as to enable the optical attenuator to adjust the optical power of the photoelectric detection signal light;
and the input end of the MCU receives the detection voltage and is used for outputting a control signal according to the detection voltage so as to control the attenuation controller to adjust the magnitude of the current applied to the optical attenuator.
In a second aspect, the present application further provides a method for monitoring received optical power, where the method includes:
receiving the detection voltage output by the sampling circuit to obtain monitoring data;
comparing the monitoring data with a preset threshold value;
if the monitoring data is larger than the preset threshold, controlling the attenuation controller to output working current to the optical attenuator so that the monitoring data is equal to the preset threshold; generating optical module receiving optical power according to a preset threshold value and outputting working current to the optical attenuator;
and if the monitoring data is smaller than or equal to the preset threshold value, generating the optical module receiving optical power according to the monitoring data.
In the optical module and the received light power monitoring method provided by the embodiment of the application, the light attenuator is arranged on the received light path of the photoelectric detector, and the MCU controls the working current of the light attenuator by controlling the attenuation controller according to the monitoring data obtained by monitoring, so as to control the attenuation amount of the signal light input by the light attenuator to the external optical fiber, realize the control of the light power of the received signal light on the photoelectric detector, and enable the photoelectric detector to receive the signal light with proper light power. Meanwhile, in the optical module provided by the application, the MCU generates the optical module received optical power according to the monitoring data obtained by monitoring and the working current on the combined optical attenuator, so that the received optical power reported by the optical module can truly reflect the optical power of the signal light input by the external optical fiber, and the optical power reflecting the signal light input by the external optical fiber is accurately monitored.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the connection relationship of an optical communication terminal;
fig. 2 is a schematic diagram of an optical network unit structure;
fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present application;
FIG. 4 is a schematic diagram of an exploded structure of an optical module according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a circuit board in an optical module according to an embodiment of the present application;
FIG. 6 is a schematic circuit diagram of an optical module according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an optical attenuator according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
One of the key links of optical fiber communication is the mutual conversion of optical signals and electric signals. The optical fiber communication uses the optical signal carrying information to transmit in the information transmission equipment such as optical fiber/optical waveguide, and the information transmission with low cost and low loss can be realized by utilizing the passive transmission characteristic of the light in the optical fiber/optical waveguide; in order to establish an information connection between an information transmission device such as an optical fiber and an information processing device such as a computer, it is necessary to perform interconversion between an electric signal and an optical signal.
The optical module realizes the function of the mutual conversion of the optical signal and the electric signal in the technical field of optical fiber communication, and the mutual conversion of the optical signal and the electric signal 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 main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the golden finger has become the mainstream connection mode of the optical module industry, and on the basis of the main connection mode, the definition of pins on the golden finger forms various industry protocols/specifications.
Fig. 1 is a schematic diagram of a connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;
one end of the optical fiber 101 is connected with a remote server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the remote server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.
The optical port of the optical module 200 is externally connected to the optical fiber 101, and bidirectional optical signal connection is established with the optical fiber 101; the electrical port of the optical module 200 is externally connected into the optical network terminal 100, and bidirectional electrical signal connection is established with the optical network terminal 100; the method comprises the steps that the mutual conversion of optical signals and electric signals is realized in an optical module, so that information connection is established between an optical fiber and an optical network terminal; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.
The optical network terminal is provided with an optical module interface 102, which is used for accessing the optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104 which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 and the network cable 103 are connected through the optical network terminal 100, specifically, the optical network terminal transmits signals from the optical module to the network cable, and transmits signals from the network cable to the optical module, and the optical network terminal is used as an upper computer of the optical module to monitor the operation of the optical module.
So far, the remote server establishes a bidirectional signal transmission channel with the local information processing equipment through the optical fiber, the optical module, the optical network terminal and the network cable.
Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, which provides data signals for the optical module and receives data signals from the optical module, and the common optical module upper computer also includes an optical line terminal and the like.
Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 includes a circuit board 105, and a cage 106 is provided on a surface of the circuit board 105; an electrical connector is arranged in the cage 106 and is used for accessing an optical module electrical port such as a golden finger; the cage 106 is provided with a radiator 107, and the radiator 107 has a convex portion such as a fin that increases a heat radiation area.
The optical module 200 is inserted into an optical network terminal, specifically, an electrical port of the optical module is inserted into an electrical connector inside the cage 106, and the optical port of the optical module is connected to the optical fiber 101.
The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged inside the cage; the light module is inserted into the cage, the light module is fixed by the cage, and the heat generated by the light module is conducted to the cage 106 and then diffused through the heat sink 107 on the cage.
Fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present application, and fig. 4 is an exploded structural diagram of an optical module according to an embodiment of the present application. As shown in fig. 3 and 4, the optical module 200 provided in the embodiment of the application includes an upper housing 201, a lower housing 202, an unlocking member 203, a circuit board 300, a silicon optical chip 400, a light source 500, and a fiber receptacle 600.
The upper case 201 is covered on the lower case 202 to form a packing cavity having two openings; the outer contour of the wrapping cavity generally presents a square shape, specifically, the lower housing 202 includes a main board and two side boards located at two sides of the main board and arranged perpendicular to the main board; the upper housing 201 includes a cover plate which is covered on two side plates of the lower housing 202 to form a wrapping cavity; the upper case 201 may further include two sidewalls disposed at both sides of the cover plate and perpendicular to the cover plate, and the two sidewalls are combined with the two side plates to realize the covering of the upper case 201 on the lower case 202.
The two openings can be two ends openings (204, 205) in the same direction or two openings in different directions; one opening is an electric port 204, and a golden finger of the circuit board extends out of the electric port 204 and is inserted into an upper computer such as an optical network terminal; the other opening is an optical port 205 for external fiber access to connect the silicon optical chip 400 inside the optical module; the circuit board 300, the silicon optical chip 400, the light source 500 and other optoelectronic devices are located in the encapsulation cavity.
The upper shell and the lower shell are combined to be assembled, so that devices such as the circuit board 300, the silicon optical chip 400 and the like can be conveniently installed in the shells, and the upper shell and the lower shell form an encapsulation protection shell of the outermost layer of the optical module; the upper shell and the lower shell are generally made of metal materials, so that electromagnetic shielding and heat dissipation are facilitated; the housing of the optical module is not generally made into an integral part, so that the positioning part, the heat dissipation part and the electromagnetic shielding part cannot be installed when devices such as a circuit board are assembled, and the production automation is not facilitated.
The unlocking component 203 is located on the outer wall of the lower housing 202, and is used for realizing or releasing the fixed connection between the optical module and the host computer.
The unlocking part 203 is provided with a clamping part matched with the upper computer cage; pulling the end of the unlocking member can relatively move the unlocking member on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer by a clamping component of the unlocking component; the unlocking part is pulled, and the clamping part of the unlocking part moves along with the unlocking part, so that the connection relation between the clamping part and the upper computer is changed, the clamping relation between the optical module and the upper computer is relieved, and the optical module can be pulled out of the cage of the upper computer.
The circuit board 300 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as MCUs, clock data recovery CDRs, power management chips, and data processing chips DSP).
The circuit board connects the electric devices in the optical module together according to the circuit design through the circuit wiring so as to realize the electric functions of power supply, electric signal transmission, grounding and the like.
The circuit board is generally a hard circuit board, and the hard circuit board can also realize bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear chips; when the optical transceiver is positioned on the circuit board, the hard circuit board can provide stable bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, specifically, a metal pin/golden finger is formed on the surface of one side tail end of the hard circuit board and is used for being connected with the electric connector; these are all inconvenient to implement with flexible circuit boards.
A flexible circuit board is also used in part of the optical modules and is used as a supplement of the hard circuit board; the flexible circuit board is generally used in cooperation with the hard circuit board, for example, the hard circuit board and the optical transceiver can be connected by using the flexible circuit board.
The silicon optical chip 400 is disposed on the circuit board 300 and electrically connected with the circuit board 300, specifically, can be wire-bonded; the periphery of the silicon photo chip is connected to the circuit board 300 through a plurality of conductive wires, so the silicon photo chip 400 is generally disposed on the surface of the circuit board 300.
The silicon optical chip 400 and the light source 500 may be optically connected by an optical fiber ribbon, and the silicon optical chip 400 receives light from the light source 500 through the optical fiber ribbon, so as to modulate the light, specifically, load a signal onto the light. The silicon optical chip 400 and the optical fiber socket 600 are connected by an optical fiber ribbon, and the optical fiber socket 600 is connected with an optical fiber outside the optical module. The signal light modulated by the silicon optical chip 400 is transmitted to the optical fiber receptacle 600 through the optical fiber ribbon, and is transmitted to the external optical fiber through the optical fiber receptacle 600; the signal light transmitted from the external optical fiber is transmitted to the optical fiber ribbon through the optical fiber socket 600, and is transmitted to the silicon optical chip 400 through the optical fiber ribbon; thereby realizing that the silicon optical chip 400 outputs or receives the signal light carrying data to or from the optical module external optical fiber.
In the optical module provided by the embodiment of the application, an input optical port is arranged on the silicon optical chip 400, a photoelectric detector is packaged in the silicon optical chip 400, signal light input through an external optical fiber is transmitted into the silicon optical chip 400 through the optical fiber band-pass through the input optical port, the signal light is transmitted to the photoelectric detector through an optical waveguide in the silicon optical chip 400, the photoelectric detector receives the signal light and converts the received signal light into a current signal, and then the photoelectric detector outputs the current signal to a transimpedance amplifier. The transimpedance amplifier amplifies and transmits the current signal output by the photoelectric detector to the limiting amplifier, and meanwhile, the transimpedance amplifier outputs detection current for detecting the light power received by the light module. The output detection current of the transimpedance amplifier is converted into detection voltage through a sampling circuit, then the detection voltage is input to the MCU, and the MCU directly generates the optical module received optical power according to the obtained detection voltage and corresponding conversion so as to read by a host computer, thereby reporting the optical module received optical power. The optical module received light power generated by the MCU is typically stored in a local memory. The transimpedance amplifier is electrically connected with the circuit board; alternatively, a transimpedance amplifier is provided on the silicon photochip 400, through which the circuit board is electrically connected.
In order to avoid damage to the photoelectric detector or poor conversion quality of the signal light received by the photoelectric detector caused by transmission of the signal light with excessive optical power to the photoelectric detector, ensure that the optical power of the signal light transmitted to the photoelectric detector is stabilized in a certain range, so that the photoelectric detector can work in an optimal state, in the embodiment of the application, an optical attenuator is also packaged in the silicon optical chip 400; optionally, the optical attenuator is a tunable optical attenuator (Variable Optical Attenuator, VOA). When the signal light with overlarge optical power is transmitted to the silicon optical chip 400 through the optical fiber belt and enters the silicon optical chip 400 through the input optical port of the silicon optical chip 400, the signal is firstly transmitted to the optical attenuator, attenuated by the optical attenuator and then transmitted to the photoelectric detector, so that the optical power of the signal light received by the photoelectric detector can be stabilized within a certain range.
In the embodiment of the application, the attenuation of the optical power of the signal light is realized by applying working current on the optical attenuator; meanwhile, the optical attenuator can control the attenuation of the signal light power by controlling the magnitude of the applied working current. Alternatively, the working current can be applied to the optical attenuator through the attenuation controller, and the MCU performs control of the attenuation controller so that the attenuation controller outputs the corresponding working current to be applied to the optical attenuator. Specifically, the MCU monitors the detection current output by the transimpedance amplifier and obtains monitoring data, and then controls the attenuation controller to output corresponding working current to the optical attenuator according to the obtained monitoring data, so that the optical power of the signal light received by the photoelectric detector can be stabilized within a certain range.
Fig. 5 is a schematic structural diagram of a circuit board in an optical module according to an embodiment of the present application. As shown in fig. 5, in the optical module provided in the embodiment of the present application, an MCU301, a sampling circuit 303, and an attenuation controller 304 are further disposed on a circuit board 300, a transimpedance amplifier 302 is disposed on a silicon optical chip 400, the sampling circuit 303 is connected between the MCU301 and the transimpedance amplifier 302, and the attenuation controller 304 is connected between the MCU301 and the silicon optical chip 400. The transimpedance amplifier 302 is connected with the silicon optical chip 400, receives the photocurrent output by the silicon optical chip 400, and outputs a detection current which is used for monitoring the optical power received by the optical module; the detection current output end of the transimpedance amplifier 302 is connected with the MCU301 through the sampling circuit 303, and the sampling circuit 303 converts the detection current into detection voltage and outputs the detection voltage to the MCU301 through the output end; the MCU301 outputs a control signal to the attenuation controller 304 according to the obtained detection voltage, and causes the attenuation controller 304 to adjust the magnitude of the current applied to the optical attenuator.
Fig. 6 is a schematic circuit diagram of an optical module according to an embodiment of the present application. As shown in fig. 6, in the optical module provided by the embodiment of the application, an optical attenuator 401 and a photoelectric detector 402 are packaged in a silicon optical chip 400, an input end of the optical attenuator 401 is connected with an input optical port of the silicon optical chip 400, and an output end of the optical attenuator 401 is connected with the photoelectric detector 402. The signal light input from the external optical fiber enters the silicon optical chip 400 through the input optical port, is transmitted to the optical attenuator 401 through the optical waveguide in the silicon optical chip 400, and is then transmitted to the photodetector 402 through the optical attenuator 401, and the photodetector 402 receives the signal light transmitted thereto and converts the signal light into a photocurrent and outputs the photocurrent.
As shown in fig. 6, the transimpedance amplifier 302 is connected to a silicon optical chip 400; specifically, the input of transimpedance amplifier 302 is connected to the output of photodetector 402. The transimpedance amplifier 302 is configured to receive the photocurrent output by the photodetector 402, and the transimpedance amplifier 302 amplifies and outputs the received photocurrent, and meanwhile, the transimpedance amplifier 302 also outputs a detection current, which can be used for detecting the optical power received by the photodetector 402.
As shown in fig. 6, the detection current output end of the transimpedance amplifier 302 is connected to the input end of the sampling circuit 303, the first output end of the sampling circuit 303 is grounded, the second output end of the sampling circuit 303 is connected to the MCU301, the detection current output by the transimpedance amplifier 302 is converted into a detection voltage by the sampling circuit 303, and the MCU301 receives the detection voltage through the second output end of the sampling circuit 303 to obtain monitoring data. Optionally, the MCU301 includes an analog-to-digital converter interface for detecting the input optical power, and a second output terminal of the sampling circuit 303 is connected to the analog-to-digital converter interface. The detection current output from the transimpedance amplifier 302 is converted into a voltage by the sampling circuit 303. The MCU301 obtains a voltage through an analog-to-digital converter interface and converts the voltage into a digital signal, and the MCU301 determines the received light power of the photodetector 402 according to the digital signal. Optionally, the MCU301 is provided with a received light power conversion function for determining the photodetector 402, and the MCU301 obtains the received light power of the photodetector 402 by inputting the digital signal obtained by the conversion into the received light power conversion function; or a lookup table is set in the MCU301, and the received light power of the photodetector 402 corresponding to the digital signal is determined by looking up the lookup table according to the digital signal obtained by conversion.
As shown in fig. 6, the attenuation controller 304 is connected between the MCU301 and the optical attenuator 401; the current output end of the attenuation controller 304 is connected with the optical attenuator 401, the mcu301 outputs a control signal to the attenuation controller 304, the attenuation controller 304 outputs a corresponding working current to the optical attenuator 401 according to the received control signal, and the optical attenuator 401 further attenuates the optical power of the signal light input by the external optical fiber according to the working size applied on the optical attenuator. In the embodiment of the present application, the MCU301 adjusts the magnitude of the working current output from the attenuation controller 304 to the optical attenuator 401 according to the monitored data obtained by the monitoring. In addition, in the embodiment of the present application, the MCU301 combines the attenuation controller 304 to output the working current and the monitored data obtained by monitoring to the optical attenuator 401 to generate the optical module received optical power, and the optical module received optical power is read by the host computer to report the optical module received optical power.
In the embodiment of the present application, the sampling circuit 303 includes a sampling resistor, one end of the sampling resistor is connected to the detection current output end of the transimpedance amplifier 302, the other end of the sampling resistor is grounded, and the second output end of the sampling circuit 303 is located between one end of the sampling resistor and the detection current output end of the transimpedance amplifier 302. The detection current output by the transimpedance amplifier 302 is converted into detection voltage through a sampling resistor and is collected by an analog-to-digital converter interface of the MCU 301. Alternatively, the sampling resistor may comprise a plurality of resistors.
Fig. 7 is a schematic structural diagram of an optical attenuator according to an embodiment of the present application. As shown in fig. 7, the optical attenuator 401 is internally provided with an optical waveguide doped with P-type and N-type materials, and the signal light is transmitted to the optical attenuator 401 and transmitted through the optical attenuator 401; when both sides of the optical attenuator 401 are energized, the concentration of the P/N carriers in the optical attenuator 401 is changed according to the change of the magnitude of the energizing current, so that the light transmitted into the optical attenuator can be attenuated, and the optical power of the light transmitted into the optical attenuator 401 can be adjusted.
In the optical module provided by the application, the MCU generates the optical module receiving optical power according to the monitoring data obtained by monitoring and the working current on the combined optical attenuator. Specifically, the method for monitoring the received light power provided by the application comprises the following steps: receiving the detection voltage output by the sampling circuit to obtain monitoring data;
comparing the monitoring data with a preset threshold value;
if the monitoring data is larger than the preset threshold, controlling the attenuation controller to output working current to the optical attenuator so that the monitoring data is equal to the preset threshold; generating optical module receiving optical power according to a preset threshold value and outputting working current to the optical attenuator;
and if the monitoring data is smaller than or equal to the preset threshold value, generating the optical module receiving optical power according to the monitoring data.
The magnitude of the preset threshold is affected by the performance of the photodetector 402, and the preset threshold is used to reflect that the photodetector 402 is operating in an optimal state and may be selected empirically. Alternatively, the optical module may be obtained by debugging, a large optical power is first provided to the optical module, then the working current of the optical attenuator 401 is adjusted by controlling the attenuation controller 304 to test the error rate condition of the receiving end of the optical module, the received optical power of the photodetector 402 monitored when the optical attenuator reaches the optimal state is selected, that is, the MCU301 monitors the obtained monitoring data when the optical module reaches the optimal state, and then the monitoring data when the optical module works in the optimal state is used as a preset threshold.
The MCU301 compares the monitored data obtained by the monitoring with a preset threshold, and when the monitored data is greater than the preset threshold, the MCU301 controls the attenuation controller to output a working current to the optical attenuator, and the optical attenuator to which the working current is applied attenuates the optical power of the signal light to be transmitted to the photodetector 402, thereby promoting the monitored data to be equal to the preset threshold. That is, the optical power of the signal light received by the photodetector 402 at the current moment is greater than the optical power in the optimal working state, the signal light incident to the silicon optical chip 400 needs to be attenuated by the optical attenuator 401 and then transmitted to the photodetector 402, so that the optical power of the signal light received by the photodetector 402 is equal to the optical power in the optimal working state at the next moment, and further the monitoring data obtained by monitoring at the next moment is equal to the preset threshold value.
In the embodiment of the present application, the MCU301 generates the optical module received optical power, specifically: when the monitored data is greater than the preset threshold, the MCU301 controls the attenuation controller to output an operating current to the optical attenuator, so that the monitored data is equal to the preset threshold, and then generates optical module received optical power according to the preset threshold and the operating current output to the optical attenuator, that is, the optical module received optical power generated by the MCU301 is equal to the monitored optical power received by the photodetector 402 plus the optical power attenuated by the optical attenuator 401.
Further, when the monitored data is less than or equal to the preset threshold value, the MCU301 controls the attenuation controller 304 to stop outputting the working current to the optical attenuator 401, that is, the working current applied to the optical attenuator 401 is zero, and further, the attenuation amount of the signal light incident on the silicon optical chip 400 by the optical attenuator 401 is zero, so that the optical power received by the MCU301 generated by the optical module is equal to the optical power received by the monitored photodetector 402, that is, the MCU301 generates the optical power received by the optical module according to the monitored data.
In the embodiment of the present application, the MCU301 controls the attenuation controller 304 to output an operation current to the optical attenuator 401, including: the MCU301 determines the theoretical operating current of the optical attenuator 401 according to the monitoring data, and controls the attenuation controller 304 to adjust the operating current output from the optical attenuator 401 to the theoretical operating current of the optical attenuator 401 according to the theoretical operating current of the optical attenuator 401.
Optionally, a theoretical working ammeter of the optical attenuator 401 corresponding to the monitoring data is set in the MCU301, and when the monitoring data is greater than a preset threshold, the MCU301 obtains the theoretical working current of the optical attenuator 401 corresponding to the monitoring data by searching the theoretical working ammeter of the optical attenuator 401 according to the monitoring data.
In the embodiment of the present application, the MCU301 reports the optical module received light power according to the preset threshold and the working current output to the optical attenuator, and when the optical module received light power needs to be generated, the corresponding lookup table is searched to obtain the optical power after the preset threshold calibration and the attenuated light power, and the sum of the optical power after the preset threshold calibration and the attenuated light power is calculated to generate the optical module received light power by respectively setting the lookup table of the optical power after the preset threshold calibration and the lookup table of the working current and the attenuated light power on the optical attenuator in the MCU 301.
Further optionally, in an embodiment of the present application, the MCU301 generates the optical module received optical power according to a preset threshold and an operating current output to the optical attenuator 401, including: calculating the calibrated optical power according to the functional relation between the preset threshold value and the calibrated optical power;
calculating the attenuated light power according to the mapping relation between the working current and the attenuated light power on the light attenuator 401;
and generating the receiving optical power of the optical module by summing the calibrated optical power and the attenuated optical power.
Through setting a functional relation between a preset threshold and the calibrated optical power and a mapping relation between working current and attenuated optical power on the optical attenuator 401 in the MCU301, when the optical module received optical power is required to be reported, the preset threshold is brought into the functional relation of the calibrated optical power, and the calibrated optical power, namely the received optical power of the photoelectric detector 402 is calculated; in addition, the optical attenuator 401 is subjected to the mapping relation of the attenuation optical power of the working current, and the attenuation optical power is calculated; and calculating the sum of the calibrated optical power and the attenuated optical power to generate the optical module received optical power.
In addition, the MCU301 is provided with a function of the monitoring data and the received light power. Therefore, when the working current applied to the optical attenuator 401 is zero, that is, the optical attenuator 401 does not attenuate the optical power of the input optical signal, the MCU301 brings the monitoring data obtained by monitoring into the functional relationship of the received optical power, calculates and generates the received optical power, and reports the calculated received optical power as the received optical power of the optical module.
When the monitored data is less than or equal to the preset threshold, the MCU301 generates the optical module received optical power according to the monitored data, and specifically includes: determining whether an operating current output by the attenuation controller to the optical attenuator is zero;
if the working current output by the attenuation controller to the optical attenuator is zero, generating optical module receiving optical power according to the monitoring data;
and if the working current output by the attenuation controller to the optical attenuator is not zero, controlling the attenuation controller to stop the working current output to the optical attenuator, and recovering the monitoring data.
When the monitoring data is smaller than or equal to the preset threshold value and the working current output by the attenuation controller to the optical attenuator is determined to be zero, the MCU301 generates optical module receiving optical power according to the monitoring data; when the monitored data is less than or equal to the preset threshold value, but it is determined that the working current output by the attenuation controller 304 to the optical attenuator 401 is not zero, the MCU301 controls the attenuation controller 304 to stop the working current output to the optical attenuator 401, and the monitored data is obtained again, and then the obtained monitored data is compared with the preset threshold value. If the obtained monitoring data is smaller than or equal to the preset threshold, the MCU301 reports the optical module received optical power according to the monitoring data, if the obtained monitoring data is larger than the preset threshold, the MCU301 controls the attenuation controller 304 to output working current to the optical attenuator 401, so that the monitoring data is equal to the preset threshold, and then generates the optical module received optical power according to the preset threshold and the working current output to the optical attenuator 401. When the monitored data is smaller than or equal to the preset threshold, it is determined that the working current output by the attenuation controller 304 to the optical attenuator 401 is not zero, that is, the attenuation of the optical attenuator 401 to the optical power of the input optical signal is too large, so that the adjustment of the attenuation of the optical attenuator 401 to the optical power of the optical signal needs to be readjusted, and the appropriate attenuation of the optical attenuator 401 to the optical power of the input optical signal is ensured. In this way, the optical module can input a high-power optical signal, so that the optical power of the optical signal received by the photodetector 402 is in the optimal working state of the photodetector 402.
Optionally, when the monitored data is greater than a preset threshold, the MCU301 controls the attenuation controller to output an operating current to the optical attenuator, including: the MCU301 determines the theoretical working current of the optical attenuator according to the monitoring data and determines whether the working current output by the attenuation controller to the optical attenuator is zero;
if the working current output by the attenuation controller to the optical attenuator is zero, controlling the working current output by the attenuation controller to the optical attenuator to be the theoretical working current of the optical attenuator;
and if the working current output by the attenuation controller to the optical attenuator is not zero, controlling the working current output by the attenuation controller to the optical attenuator to be increased to the theoretical working current of the optical attenuator.
When the MCU301 outputs a control signal to the attenuation controller 304, the attenuation controller 304 can correspondingly control whether the current is zero to the optical attenuator 401 according to the current working current, which is helpful for rapidly adjusting the optical power attenuation of the optical attenuator 401 to a suitable range, and ensuring that the optical power of the optical signal received by the photodetector 402 is in the optimal working state of the photodetector 402.
Optionally, in the embodiment of the present application, the MCU301 generates the optical module received optical power by 16 scale. Therefore, when the MCU301 calculates the sum of the calibrated optical power and the attenuated optical power, the sum of the calibrated optical power and the attenuated optical power is converted into 16 scale and then used as the optical module receiving optical power; and according to the functional relation between the monitoring data and the received light power, calculating the received light power, and converting the calculated received light power into 16-system received light power serving as the light module.
In the optical module provided by the embodiment of the application, the optical attenuator 401 is arranged on the receiving optical path of the photoelectric detector 402, the mcu301 controls the working current of the optical attenuator 401 by controlling the attenuation controller 304 according to the monitoring data obtained by monitoring, so as to control the attenuation amount of the signal light input by the optical attenuator 401 to the external optical fiber, and realize the control of the optical power of the receiving signal light on the photoelectric detector 402, so that the photoelectric detector 402 can receive the signal light with proper optical power. Meanwhile, in the optical module provided by the application, the MCU301 generates the optical module received optical power according to the monitoring data obtained by monitoring and the working current on the combined optical attenuator 401, so that the optical module reports the received optical power to truly reflect the optical power of the signal light input by the external optical fiber, and the optical power of the signal light input by the external optical fiber is monitored accurately.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. An optical module, comprising:
a circuit board;
the silicon optical chip is electrically connected with the circuit board and is used for receiving signal light input by an external optical fiber and outputting photocurrent;
wherein, the inside of the silicon optical chip is provided with an optical attenuator and a photoelectric detector;
the optical attenuator is an optical waveguide doped with P-type materials and N-type materials, two sides of the optical waveguide are electrified, the input end of the optical attenuator is optically connected with an external optical fiber through the optical waveguide connected with an input optical port in the silicon optical chip, the output end of the optical attenuator is connected with the photoelectric detector, and signal light input by the external optical fiber is transmitted to the photoelectric detector after passing through the optical attenuator;
the photoelectric detector receives the signal light passing through the optical attenuator and outputs photocurrent;
the optical module further comprises:
the transimpedance amplifier is electrically connected with the circuit board, and the input end of the transimpedance amplifier is connected with the output end of the photoelectric detector and is used for receiving the photocurrent and outputting detection current through the detection current output end;
the input end of the sampling circuit is connected with the detection current output end and is used for converting the detection current into detection voltage and outputting the detection voltage through the output end;
the current output end of the attenuation controller is connected with the optical attenuator and is used for applying current to the optical attenuator so as to enable the optical attenuator to adjust the optical power of the light transmitted to the photoelectric detection signal;
the MCU is used for receiving the detection voltage at the input end and outputting a control signal according to the detection voltage so as to control the attenuation controller to adjust the magnitude of the current applied to the optical attenuator;
the MCU is further configured to: obtaining monitoring data according to the detection voltage;
comparing the monitoring data with a preset threshold value;
if the monitoring data is larger than the preset threshold, controlling the attenuation controller to output working current to the optical attenuator so that the monitoring data is equal to the preset threshold;
calculating the calibrated optical power according to the functional relation between the preset threshold value and the calibrated optical power;
calculating the attenuation optical power according to the mapping relation between the working current and the attenuation optical power on the optical attenuator;
and calculating the sum of the calibrated optical power and the attenuated optical power to generate the optical module receiving optical power.
2. The light module of claim 1 wherein the MCU further generates light module received light power based on the detected voltage and the magnitude of the current applied by the attenuation controller to the light attenuator.
3. The optical module of claim 1, wherein the sampling circuit comprises a sampling resistor, one end of the sampling resistor is connected to the detection current output end, the other end of the sampling resistor is grounded, and the sampling resistor is used for converting the detection current into the detection voltage and outputting the detection voltage through the output end.
4. The optical module of claim 1, wherein controlling the attenuation controller to output the operating current to the optical attenuator comprises:
and determining the theoretical working current of the optical attenuator according to the monitoring data, and controlling the attenuation controller to adjust the working current output by the optical attenuator to the theoretical working current of the optical attenuator according to the theoretical working current of the optical attenuator.
5. The optical module of claim 1, wherein generating optical module received optical power from the monitoring data comprises:
and calculating and generating the received optical power of the optical module according to the functional relation between the monitoring data and the received optical power.
6. The optical module of claim 1, wherein generating optical module received optical power from the monitoring data comprises:
determining whether an operating current output by the attenuation controller to the optical attenuator is zero;
if the working current output by the attenuation controller to the optical attenuator is zero, generating optical module receiving optical power according to the monitoring data;
and if the working current output by the attenuation controller to the optical attenuator is not zero, controlling the attenuation controller to stop the working current output to the optical attenuator, and recovering the monitoring data.
7. The optical module of claim 1, wherein controlling the attenuation controller to output the operating current to the optical attenuator comprises:
determining a theoretical working current of the optical attenuator according to the monitoring data and determining whether the working current output by the attenuation controller to the optical attenuator is zero or not;
if the working current output by the attenuation controller to the optical attenuator is zero, controlling the working current output by the attenuation controller to the optical attenuator to be the theoretical working current of the optical attenuator;
and if the working current output by the attenuation controller to the optical attenuator is not zero, controlling the working current output by the attenuation controller to the optical attenuator to be increased to the theoretical working current of the optical attenuator.
8. The optical module of claim 1, wherein calculating the sum of the collimated optical power and the attenuated optical power to generate an optical module received optical power comprises:
and calculating the sum of the calibrated optical power and the attenuated optical power, and converting the sum of the calibrated optical power and the attenuated optical power into 16-system light to be used as the optical module receiving optical power.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110192114.0A CN114966997B (en) | 2021-02-20 | 2021-02-20 | Optical module and received light power monitoring method |
| PCT/CN2021/134681 WO2022174646A1 (en) | 2021-02-20 | 2021-12-01 | Optical module and received optical power monitoring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110192114.0A CN114966997B (en) | 2021-02-20 | 2021-02-20 | Optical module and received light power monitoring method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114966997A CN114966997A (en) | 2022-08-30 |
| CN114966997B true CN114966997B (en) | 2023-09-26 |
Family
ID=82931172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110192114.0A Active CN114966997B (en) | 2021-02-20 | 2021-02-20 | Optical module and received light power monitoring method |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114966997B (en) |
| WO (1) | WO2022174646A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116032372A (en) * | 2023-03-31 | 2023-04-28 | 成都光创联科技有限公司 | Light receiving device, optical module, and overload control method for light receiving device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102577182A (en) * | 2011-12-28 | 2012-07-11 | 华为技术有限公司 | Optical line terminal and method for processing amplified spontaneous emission by same |
| CN103532634A (en) * | 2013-10-23 | 2014-01-22 | 中国电子科技集团公司第三十四研究所 | Optical fiber communication system capable of regulating received optical power adaptively and running method thereof |
| CN104821845A (en) * | 2015-05-13 | 2015-08-05 | 四川华拓光通信股份有限公司 | Method for calibrating luminous power of receiving end of optical module |
| CN104836613A (en) * | 2015-05-13 | 2015-08-12 | 四川华拓光通信股份有限公司 | Method for calibrating receiving end optical power of optical module |
| CN206237410U (en) * | 2016-07-13 | 2017-06-09 | 潘岭 | A kind of light delivery module with supervisory circuit |
| JP2019208111A (en) * | 2018-05-29 | 2019-12-05 | 日本電気株式会社 | Optical receiver and reception method |
| WO2020248743A1 (en) * | 2019-06-13 | 2020-12-17 | 青岛海信宽带多媒体技术有限公司 | Optical module |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11205395A (en) * | 1998-01-20 | 1999-07-30 | Nec Eng Ltd | Optical signal receiver and duty control circuit |
| CN104811249A (en) * | 2014-01-24 | 2015-07-29 | 上海新纳通信技术有限公司 | Low-loss network type optical receiver and control method |
| CN208768073U (en) * | 2018-08-03 | 2019-04-19 | 上海欣诺通信技术股份有限公司 | Light-dividing device |
| CN110794529B (en) * | 2020-01-06 | 2020-05-08 | 成都新易盛通信技术股份有限公司 | Optical assembly and system thereof |
| CN111884725B (en) * | 2020-07-24 | 2024-05-28 | 中国电子科技集团公司第三十四研究所 | Multipurpose broadband intelligent radio frequency photoelectric integrated transmitting and receiving assembly |
-
2021
- 2021-02-20 CN CN202110192114.0A patent/CN114966997B/en active Active
- 2021-12-01 WO PCT/CN2021/134681 patent/WO2022174646A1/en active Application Filing
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102577182A (en) * | 2011-12-28 | 2012-07-11 | 华为技术有限公司 | Optical line terminal and method for processing amplified spontaneous emission by same |
| CN103532634A (en) * | 2013-10-23 | 2014-01-22 | 中国电子科技集团公司第三十四研究所 | Optical fiber communication system capable of regulating received optical power adaptively and running method thereof |
| CN104821845A (en) * | 2015-05-13 | 2015-08-05 | 四川华拓光通信股份有限公司 | Method for calibrating luminous power of receiving end of optical module |
| CN104836613A (en) * | 2015-05-13 | 2015-08-12 | 四川华拓光通信股份有限公司 | Method for calibrating receiving end optical power of optical module |
| CN206237410U (en) * | 2016-07-13 | 2017-06-09 | 潘岭 | A kind of light delivery module with supervisory circuit |
| JP2019208111A (en) * | 2018-05-29 | 2019-12-05 | 日本電気株式会社 | Optical receiver and reception method |
| WO2020248743A1 (en) * | 2019-06-13 | 2020-12-17 | 青岛海信宽带多媒体技术有限公司 | Optical module |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114966997A (en) | 2022-08-30 |
| WO2022174646A1 (en) | 2022-08-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114035287B (en) | Optical module | |
| CN111431604A (en) | Method for reporting L OS signal and optical module | |
| CN113917622B (en) | Optical module | |
| CN111193547A (en) | Optical module | |
| CN117148517A (en) | Optical module | |
| CN114745052B (en) | Optical module | |
| CN114966997B (en) | Optical module and received light power monitoring method | |
| WO2020108294A1 (en) | Optical module | |
| CN112782811B (en) | Optical module | |
| CN212627918U (en) | Optical module | |
| CN111431611B (en) | Optical module | |
| CN114826409B (en) | Optical module | |
| CN114172571B (en) | Optical module and optical module LOS optimization method | |
| CN111596421B (en) | Optical module | |
| CN213302587U (en) | Optical module | |
| CN114070393B (en) | Optical module | |
| CN111431612B (en) | Optical module | |
| WO2021169756A1 (en) | Optical module | |
| CN114070413B (en) | Optical module | |
| CN115085804A (en) | Optical module and received optical power calculation method | |
| CN113009649B (en) | Optical module | |
| CN114647037A (en) | Optical module | |
| CN113703100A (en) | Optical module | |
| CN114531203B (en) | Optical module | |
| CN213213471U (en) | Optical module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |