CN218352506U - Light receiving device and optical module - Google Patents

Abstract

The application discloses light receiving element and optical module includes: and the receiving optical fiber adapter is used for receiving the external signal light. And the optical splitter is used for splitting the signal light into a first sub-signal light and a second sub-signal light. And the optical power detector is positioned on a second light splitting optical path of the light splitter and converts the optical power of the second sub-signal light into a current signal. The first gain amplifier and the second gain amplifier gain-amplify the current signal. The analog-to-digital converter converts the amplified current signal into a current power value and writes the current power value into the MCU. The control chip includes: the first output pin is connected with the input end of the second gain amplifier; the second output pin is connected with the output of the second gain amplifier; when the current power value is larger than or equal to the preset power limit value, the first output pin and the second output pin are in short circuit, the amplification factor of the gain amplification circuit is reduced, the optical power reporting range is enlarged, and the reporting precision is improved.

Description

Optical receiving device and optical module

Technical Field

The present application relates to the field of communications technologies, and in particular, to an optical receiver and an optical module.

Background

One of the core links of optical communication is the interconversion of optical and electrical signals. Optical communication uses optical signals carrying information to transmit in information transmission equipment such as optical fiber/optical waveguide, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fiber/optical waveguide; in order to establish information connection between information transmission devices such as optical fibers and optical waveguides and information processing devices such as computers, interconversion between electrical signals and optical signals is required.

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 mainly used for photoelectric and electro-optical conversion, wherein a transmitting end of the optical module converts an electric signal into an optical signal and transmits the optical signal out through an optical fiber, and a receiving end of the optical module converts a received optical signal into an electric signal.

In order to monitor the operating state of the optical module in real time, the upper computer generally reports the optical power in a polling manner.

SUMMERY OF THE UTILITY MODEL

The application provides an optical receiving device and an optical module to improve the communication rate of the optical module.

In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:

the embodiment of the application discloses light receiving element and optical module includes:

a receiving optical fiber adapter for receiving external signal light;

the optical splitter is positioned on the light emitting path of the receiving optical fiber adapter and divides the signal light into first sub-signal light and second sub-signal light;

the optical power detector is positioned on a second light splitting optical path of the optical splitter and converts the optical power of the second sub-signal light into a current signal;

the input end of the first gain amplifier is connected with the optical power detector;

the input end of the second gain amplifier is connected with the output end of the first gain amplifier;

the analog-to-digital converter is connected with the output end of the second booster, converts the amplified current signal into a current power value and writes the current power value into the MCU;

control chip, with MCU connects, includes: the first output pin is connected with the input end of the second gain amplifier;

a second output pin connected with the output of the second gain amplifier;

when the current power value is smaller than a preset power limit value, the first output pin and the second output pin are disconnected;

and when the current power value is greater than or equal to a preset power limit value, the first output pin and the second output pin are in short circuit.

The beneficial effect of this application:

the application discloses light receiving element and optical module includes: and the receiving optical fiber adapter is used for receiving the external signal light. And the optical splitter is positioned on the light outgoing path of the receiving optical fiber adapter and divides the signal light into first sub-signal light and second sub-signal light. And the optical power detector is positioned on a second light splitting optical path of the optical splitter and converts the optical power of the second sub-signal light into a current signal. The first gain amplifier and the second gain amplifier gain-amplify the current signal. And the analog-to-digital converter is connected with the output end of the second gain amplifier, converts the amplified current signal into a current power value, and writes the current power value into the MCU. The control chip includes: the first output pin is connected with the input end of the second gain amplifier; a second output pin connected with the output of the second gain amplifier; when the current power value is larger than or equal to the preset power limit value, the first output pin and the second output pin are in short circuit. According to the method, the optical power limit value is preset, the current power value is smaller than the optical power limit value, and the control chip controls the amplification factor of the gain amplification circuit to be larger; when the current power value is larger than or equal to the optical power limit value, the control chip controls the input end and the output end of the second gain amplifier to be in short circuit, the amplification factor of the gain amplification circuit is reduced, the optical power reporting range is enlarged, the reporting precision is improved, the optical power range received by the receiving end of the optical module is enlarged, and the application range of the optical module is enlarged.

Drawings

In order to more clearly illustrate the technical solutions in the present disclosure, the drawings needed to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art according to the drawings. Furthermore, the drawings in the following description may be regarded as schematic diagrams, and do not limit the actual size of products, the actual flow of methods, the actual timing of signals, and the like, involved in the embodiments of the present disclosure.

FIG. 1 is a connection diagram of an optical communication system according to some embodiments;

FIG. 2 is a block diagram of an optical network terminal according to some embodiments;

FIG. 3 is a block diagram of a light module according to some embodiments;

FIG. 4 is an exploded view of a light module according to some embodiments;

FIG. 5 is a schematic illustration of an assembly of a light emitting device and a light receiving device according to some embodiments;

FIG. 6 is an internal structural diagram of a light emitting device and a light receiving device according to some embodiments;

FIG. 7 is an enlarged block diagram of a light receiving device according to some embodiments;

fig. 8 is a schematic view of a light receiving device shown in the present application;

fig. 9 is a second schematic diagram of a light receiving device shown in the present application;

fig. 10 is a schematic view of another light-receiving device of an example of the present application.

Detailed Description

Technical solutions in some embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present disclosure are within the scope of protection of the present disclosure.

In an optical communication system, an optical signal is used to carry information to be transmitted, and the optical signal carrying the information is transmitted to information processing equipment such as a computer through information transmission equipment such as an optical fiber or an optical waveguide, so as to complete information transmission. Since light has a passive transmission characteristic when transmitted through an optical fiber or an optical waveguide, low-cost and low-loss information transmission can be realized. Further, since a signal transmitted by an information transmission device such as an optical fiber or an optical waveguide is an optical signal and a signal that can be recognized and processed by an information processing device such as a computer is an electrical signal, it is necessary to perform interconversion between the electrical signal and the optical signal in order to establish an 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.

The optical module realizes the function of interconversion between the optical signal and the electrical signal in the technical field of optical communication. The optical module comprises an optical port and an electric port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides and the like through the optical port, realizes electric connection with an optical network terminal (such as an optical modem) through the electric port, and the electric connection is mainly used for power supply, I2C signal transmission, data information transmission, grounding and the like; the optical network terminal transmits the electric signal to the information processing equipment such as a computer through a network cable or a wireless fidelity (Wi-Fi).

Fig. 1 is a connection diagram of an optical communication system. As shown in fig. 1, the optical communication system includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101, and a network cable 103.

One end of the optical fiber 101 is connected to the remote server 1000, and the other end is connected to the optical network terminal 100 through the optical module 200. The optical fiber itself can support long-distance signal transmission, for example, signal transmission of thousands of meters (6 km to 8 km), on the basis of which if a repeater is used, theoretically infinite distance transmission can be realized. Therefore, in a typical optical communication system, the distance between the remote server 1000 and the onu 100 may be several kilometers, tens of kilometers, or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000, and the other end is connected to the optical network terminal 100. The local information processing apparatus 2000 may be any one or several of the following apparatuses: router, switch, computer, cell-phone, panel computer, TV set etc..

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing apparatus 2000 and the optical network terminal 100. The connection between the local information processing apparatus 2000 and the remote server 1000 is made by the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is completed by the optical module 200 and the optical network terminal 100.

The optical module 200 includes an optical port configured to access the optical fiber 101 and an electrical port, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100, so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. The optical module 200 converts an optical signal and an electrical signal to each other, so that an information connection is established between the optical fiber 101 and the optical network terminal 100. For example, an optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100, and an electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101. Since the optical module 200 is a tool for implementing the interconversion between the optical signal and the electrical signal, and has no function of processing data, information is not changed in the above-mentioned photoelectric conversion process.

The optical network terminal 100 includes a housing (housing) having a substantially rectangular parallelepiped shape, and an optical module interface 102 and a network cable interface 104 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 establishes a bidirectional electrical signal connection with the optical module 200; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. The optical module 200 is connected to the network cable 103 via the optical network terminal 100. For example, the optical network terminal 100 transmits the electrical signal from the optical module 200 to the network cable 103, and transmits the electrical signal from the network cable 103 to the optical module 200, so that the optical network terminal 100 can monitor the operation of the optical module 200 as an upper computer of the optical module 200. The upper computer of the Optical module 200 may include an Optical Line Terminal (OLT) in addition to the Optical network Terminal 100.

The remote server 1000 establishes a bidirectional signal transmission channel with the local information processing device 2000 through the optical fiber 101, the optical module 200, the optical network terminal 100, and the network cable 103.

Fig. 2 is a configuration diagram of the optical network terminal, and fig. 2 only shows a configuration of the optical module 200 of the optical network terminal 100 in order to clearly show a connection relationship between the optical module 200 and the optical network terminal 100. As shown in fig. 2, the optical network terminal 100 further includes a circuit board 105 disposed within the housing, a cage 106 disposed on a surface of the circuit board 105, a heat sink 107 disposed on the cage 106, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into a cage 106 of the optical network terminal 100, the cage 106 holds the optical module 200, and heat generated by the optical module 200 is conducted to the cage 106 and then diffused by a heat sink 107. After the optical module 200 is inserted into the cage 106, the electrical port of the optical module 200 is connected to the electrical connector inside the cage 106, so that the optical module 200 is connected to the optical network terminal 100 by a bidirectional electrical signal. Further, an optical port of the optical module 200 is connected to the optical fiber 101, and the optical module 200 establishes bidirectional optical signal connection with the optical fiber 101.

Fig. 3 is a block diagram of a light module according to some embodiments. As shown in fig. 3, the optical module 200 includes a housing (shell), a circuit board disposed in the housing, and an optical transceiver module 400.

The shell comprises an upper shell 201 and a lower shell 202, wherein the upper shell 201 is covered on the lower shell 202 to form the shell with two openings; the outer contour of the housing generally appears square.

In some embodiments of the present disclosure, the lower housing 202 includes a bottom plate 2021 and two lower side plates 2022 located at both sides of the bottom plate 2021 and disposed perpendicular to the bottom plate; the upper case 201 includes a cover plate covering both lower side plates of the lower case 202 to form the above case.

In some embodiments, the lower housing 202 includes a bottom plate and two lower side plates disposed at both sides of the bottom plate and perpendicular to the bottom plate; the upper housing 201 includes a cover plate and two upper side plates disposed on two sides of the cover plate 2011 and perpendicular to the cover plate, and is combined with the two lower side plates by the two upper side plates to cover the upper housing 201 on the lower housing 202.

The direction of the connecting line of the two openings 204 and 205 may be the same as the length direction of the optical module 200, or may not be the same as the length direction of the optical module 200. For example, the opening 204 is located at an end portion (right end in fig. 3) of the optical module 200, and the opening 205 is also located at an end portion (left end in fig. 3) of the optical module 200. Alternatively, the opening 204 is located at an end of the optical module 200, and the opening 205 is located at a side of the optical module 200. The opening 204 is an electrical port, and a gold finger of the circuit board extends out of the electrical port 204 and is inserted into an upper computer (for example, the optical network terminal 100); the opening 205 is an optical port configured to access the external optical fiber 101, so that the external optical fiber 101 is connected to the optical transceiver module 400 inside the optical module 200.

The upper shell 201 and the lower shell 202 are combined to assemble the circuit board, the optical transceiver module 400 and other devices in the shell, and the upper shell 201 and the lower shell 202 form encapsulation protection for the devices. In addition, when the devices such as the circuit board, the optical transceiver module 400 and the like are assembled, the positioning components, the heat dissipation components and the electromagnetic shielding components of the devices are convenient to arrange, and the automatic production is facilitated.

In some embodiments, the upper housing 201 and the lower housing 202 are generally made of metal materials, which is beneficial to achieve electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking component located outside its housing, and the unlocking component is configured to realize a fixed connection between the optical module 200 and the upper computer or release the fixed connection between the optical module 200 and the upper computer.

Illustratively, the unlocking member is located on the outer wall of the two lower side plates 2022 of the lower housing 202, and has a latching member that mates with a host cage (e.g., the cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the engaging member of the unlocking member; when the unlocking member is pulled, the engaging member of the unlocking member moves along with the unlocking member, and further the connection relationship between the engaging member and the upper computer is changed, so that the engagement relationship between the optical module 200 and the upper computer is released, and the optical module 200 can be drawn out from the cage of the upper computer.

The circuit board comprises circuit wiring, an electronic element and a chip, and the electronic element and the chip are connected together through the circuit wiring according to circuit design so as to realize functions of power supply, electric signal transmission, grounding and the like. Examples of the electronic components include capacitors, resistors, transistors, and Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs). The chip includes, for example, a Micro Controller Unit (MCU), a laser driver chip, a limiting amplifier (limiting amplifier), a Clock and Data Recovery (CDR) chip, a power management chip, and a Digital Signal Processing (DSP) chip.

The circuit board is generally a rigid circuit board, and the rigid circuit board can also realize a bearing effect due to the relatively hard material of the rigid circuit board, for example, the rigid circuit board can stably bear the electronic element and the chip; when the optical transceiver component is positioned on the circuit board, the rigid circuit board can also provide smooth bearing; the rigid circuit board can also be inserted into an electric connector in the cage of the upper computer.

The circuit board further comprises a gold finger formed on an end surface thereof, and the gold finger is composed of a plurality of pins independent of each other. The circuit board is inserted into the cage 106 and electrically connected to the electrical connector in the cage 106 by gold fingers. The gold fingers may be disposed on only one side of the circuit board (e.g., the upper surface shown in fig. 4), or may be disposed on both upper and lower sides of the circuit board, so as to adapt to the situation with a large demand for the number of pins. The golden finger is configured to establish an electrical connection with the upper computer to realize power supply, grounding, I2C signal transmission, data signal transmission and the like.

Of course, a flexible circuit board is also used in some optical modules. Flexible circuit boards are generally used in conjunction with rigid circuit boards to supplement the rigid circuit boards. For example, a flexible circuit board may be used to connect the rigid circuit board and the optical transceiver module.

The optical transceiving component comprises an optical transmitting device and an optical receiving device, wherein the optical transmitting device is configured to transmit optical signals, and the optical receiving device is configured to receive the optical signals. Illustratively, the light emitting device and the light receiving device are combined together to form an integrated light transceiving component.

In the present application, the light emitting device 300 and the light receiving device 400 are packaged in a micro-optical manner, the light emitting device 300 converts the received electrical signal into an optical signal, and the light receiving device 500 converts the received optical signal into an electrical signal, so as to realize the photoelectric conversion function of the optical module.

The specific arrangement of the light emitting device 300 and the light receiving device 400 on the circuit board 105 can refer to fig. 5; the light emitting device 300 is located at the edge of the circuit board 105, and the light emitting device 300 and the light receiving device 400 are arranged on the surface of the circuit board 105 in a staggered manner, so that a better electromagnetic shielding effect is realized. The circuit board 105 is provided with a notch for placing the light emitting device 300, and the notch can be arranged in the middle of the circuit board 105 or at the edge of the circuit board 105; the light emitting device 300 is embedded in the notch to facilitate the insertion of the circuit board into the light emitting device 300, and also to facilitate the fixation of the light emitting device and the circuit board. The light receiving device 400 is disposed on the surface of the circuit board 105, and in another common packaging method, the light receiving device is physically separated from the circuit board and electrically connected through a flexible circuit board.

The optical module is also provided with a receiving optical fiber adapter and a transmitting optical fiber adapter, and the receiving optical fiber adapter is connected with the light receiving device and used for receiving external receiving signal light and transmitting the signal light to the light receiving device. The emission optical fiber adapter is connected with the light emitting device and transmits the signal light emitted by the light emitting device to the outside.

Fig. 6 shows a schematic diagram of a specific structure of the light emitting device 300 and the light receiving device 400, as shown in fig. 6, the light emitting device 300 includes a cover plate 301, a cavity 302, a laser array 303, a lens array 304 and a light multiplexing component 305 are disposed in the cavity, and the cover plate 301 covers the surface of the cavity 302; taking the example that the laser array 303 includes 4 lasers, the lens array correspondingly includes 4 collimating lenses, the lasers emit optical signals, after being coupled by the collimating lenses, the 4 optical signals enter the optical multiplexing component 305, the 4 optical signals are combined into 1 optical signal by the combination of the optical multiplexing component 305, and the optical fiber is transmitted to the outside.

As shown in fig. 7, the light receiving device 400 includes a light receiving chip 401, a transimpedance amplification chip 402, and an arrayed waveguide grating 409, where the light receiving chip 401 is disposed on the surface of the circuit board 105, and is specifically pasted on the surface of the circuit board 105 by a conductive silver paste, the transimpedance amplification chip 402 is disposed on the surface of the circuit board 105, and is specifically pasted on the surface of the circuit board 105 by a conductive silver paste, one end of the arrayed waveguide grating 409 is connected to an optical fiber, and the other end covers the surface of the light receiving chip 401, and specifically, the arrayed waveguide grating 409 and the surface of the light receiving chip 401 may be connected by a UV glue; the arrayed waveguide grating 409 can perform light beam splitting on received light signals according to wavelength, the split light signals are transmitted to the corresponding light receiving chip 401, the light receiving chip 401 converts the light signals into current signals, the transimpedance amplification chip 402 converts the current signals into voltage signals, amplifies the voltage signals, sends the voltage signals to the circuit board 105, and finally transmits the voltage signals through the circuit board 105. When the light receiving device 400 includes 4 light receiving chips 401, the signal light will include signal light of 4 wavelengths, and the arrayed waveguide grating 409 divides the received signal light into 4 signal light beams according to the light wavelengths, and then transmits the divided signal light beams to the light receiving chips 401 in a one-to-one correspondence.

In order to realize monitoring of received optical power, an optical splitter is disposed between the arrayed waveguide grating 409 and the optical receiving chip 401, and divides received signal light into two beams, including: the first sub received signal light and the second sub received signal light. The first sub-receiving signal light enters the light receiving chip 401, converts an optical signal into a current signal, and the transimpedance amplification chip 402 converts the current signal into a voltage signal, amplifies the voltage signal, sends the amplified voltage signal to the circuit board 105, and finally transmits the amplified voltage signal through the circuit board 105. The second sub received signal light enters the optical power detector.

Fig. 8 is a schematic diagram of a light receiving device shown in the present application, and as shown in fig. 8, the light receiving device is further provided with an optical power detector, a first gain amplifier, a second gain amplifier, and an analog-to-digital converter. Wherein the first gain amplifier and the second gain amplifier are connected in series. The second sub-receiving signal light enters the optical power detector, the optical power is converted into a power current signal, and the first gain amplifier amplifies the power current signal for the first time to form a primary gain current signal. The second gain amplifier performs secondary amplification on the primary gain current signal to form a secondary gain current signal. The analog-to-digital converter receives the secondary gain current signal and converts the secondary gain current signal into a current power value, and the analog-to-digital converter is also connected with the MCU through an IIC signal line and writes the power value into an MCU internal register. And the upper computer collects the power value stored in the register in a polling mode. The method comprises the steps that a light power limit value is preset in an MCU, the current power value is smaller than the light power limit value, and the MCU controls a first gain amplifier and a second gain amplifier to be started; when the current power value is larger than or equal to the optical power limit value, the MCU controls the second gain amplifier to be closed, and the first gain amplifier works.

In some examples of the present application, the control chip may be disposed inside the MCU, or as shown in fig. 9, the control chip may be disposed outside the MCU.

In the application, the amplification factors of the first gain amplifier and the second gain amplifier are fixed values, and the amplification factors do not change.

The setting of the optical power limit value can be set according to actual conditions, and can be set according to the amplification factors of the first gain amplifier and the second gain amplifier and the actual application environment of the optical module.

The analog-to-digital converter receives the secondary gain current signal and converts the secondary gain current signal into a current power value, and writes the current light power value into the MCU. The control chip presets the optical power limit value, if the current power value is smaller than the optical power limit value, the control chip controls the first gain amplifier and the second gain amplifier to be simultaneously started. When the current power value is smaller than the optical power limit value, the limit value of optical power detection is close to, and in order to avoid influencing the normal work of the optical receiving device, the control chip controls the first gain amplifier and the second gain amplifier to be simultaneously started, and under the condition that the amplification factors of the first gain amplifier and the second gain amplifier are not changed, the integral amplification factor is increased compared with the single use of the first gain amplifier, so that the lower limit value reported by the optical power is reduced.

Specifically, the control chip sets a first output pin to be connected with an input end of the second gain amplifier, the second output pin is connected with an output end of the second gain amplifier, and when the current power value is smaller than the optical power limit value, a first switch of the control chip opens the first output pin and the second output pin, so that the first gain amplifier and the second gain amplifier are simultaneously started. When the current power value is larger than or equal to the optical power limit value, the second switch selected by the control chip enables the first output pin and the second output pin to be in short circuit, so that the first gain amplifier is started, and the second gain amplifier is closed.

If the current power value is larger than or equal to the light power limit value, the control chip controls the second gain amplifier to be closed, and the first gain amplifier works. When the current power value is greater than or equal to the optical power limit value, the limit value of optical power detection is close to, in order to avoid influencing the normal work of the optical receiving device, the control chip controls the first gain amplifier to be opened, the second gain amplifier is closed, and under the condition that the amplification factors of the first gain amplifier and the second gain amplifier are not changed, the integral amplification factor is reduced compared with the condition that the first gain amplifier and the second gain amplifier are jointly used, so that the upper limit value reported by the optical power is improved.

Therefore, the light power limit value is preset in the MCU, the current power value is smaller than the light power limit value, and the control chip controls the first gain amplifier and the second gain amplifier to be simultaneously started; when the current power value is larger than or equal to the optical power limit value, the control chip controls the second gain amplifier to be closed, the first gain amplifier works, the optical power reporting range is increased, the reporting precision is improved, the optical power range received by the receiving end of the optical module is increased, and the application range of the optical module is improved.

The MCU is provided with a first switch and a second switch, wherein the second switch is connected with the input end and the output end of the second gain amplifier. When the current power value is smaller than the optical power limit value, the control chip controls the first gain amplifier and the second gain amplifier to be simultaneously started; when the current power value is larger than or equal to the optical power limit value, the first power supply pin and the second power supply pin of the MCU are output, and the first gain amplifier works, so that the optical power reporting range is increased, the reporting precision is improved, the optical power range received by the receiving end of the optical module is increased, and the application range of the optical module is improved.

In some embodiments of the present application, the control chip may be disposed inside the MCU, or may be disposed outside the MCU, which is not limited to this.

The optical splitter splits the received signal light into two beams, namely a first sub-received signal light and a second sub-received signal light, and for convenience of calculation of optical power, the optical power of the second sub-received signal light is 5% of that of the received signal light.

When the light receiving device 400 includes 4 light receiving chips 401, the signal light will include signal light of 4 wavelengths, the arrayed waveguide grating 409 divides the received signal light into 4 signal light beams according to the light wavelengths, and then 4 optical splitters are provided, each of which divides the signal light into two sub-signal light beams, one of which is transmitted to the light receiving chip 401, and the other is transmitted to the optical power detector. The optical power is converted into a power current signal, and the first gain amplifier amplifies the power current signal for the first time to form a primary gain current signal. The second gain amplifier secondarily amplifies the primary gain current signal to form a secondary gain current signal. The analog-to-digital converter receives the secondary gain current signal and converts the secondary gain current signal into a current power value, and the analog-to-digital converter is also connected with the MCU through an IIC signal line and writes the power value into an MCU internal register. And the upper computer acquires the power value stored in the register in a polling mode. The method comprises the steps that a light power limit value is preset in the MCU, and the control chip controls the first gain amplifier and the second gain amplifier to be started when the current power value is smaller than the light power limit value; when the current power value is larger than or equal to the light power limit value, the control chip controls the second gain amplifier to be closed, and the first gain amplifier works. The method comprises the steps that a light power limit value is preset in the MCU, the current power value is smaller than the light power limit value, and the control chip controls the first gain amplifier and the second gain amplifier to be started simultaneously; when the current power value is larger than or equal to the optical power limit value, the control chip controls the second gain amplifier to be closed, the first gain amplifier works, the optical power reporting range is increased, the reporting precision is improved, the optical power range received by the receiving end of the optical module is increased, and the application range of the optical module is improved.

The adjustable gain control circuit is used, so that different receiving light ranges can use different gains, when the value of the receiving light power is small, the first gain amplifier and the second gain amplifier can be used for amplifying at the same time, and the adjustable gain control circuit has enough amplification and does not exceed the identification range of the digital-to-analog converter; when the received optical power is larger, the first gain amplifier can be used for amplification, sufficient amplification is achieved, the second gain amplifier does not work, the amplification factor is reduced, and the identification range of the digital-to-analog converter is not exceeded. The reporting range of a receiving end is expanded, so that the reporting precision is improved, and the optical module can be adapted in different access optical scenes.

In order to realize accurate reporting of the optical power, a first mapping relation and a second mapping relation are set in the analog-to-digital converter, wherein the first mapping relation is different from the second mapping relation. The first mapping relation is a mapping relation between the voltage signal and the optical power when the first gain amplifier and the second gain amplifier are simultaneously started; the second mapping relation is that the first gain amplifier is turned on and the second gain amplifier is turned off.

The application provides a method for reporting optical power of an optical receiving device, which comprises the following steps: converting the optical power into a current signal by using an optical power detector; when the current power value is smaller than the optical power limit value, the control chip controls the first gain amplifier and the second gain amplifier to be started; when the current power value is larger than or equal to the light power limit value, the control chip controls the second gain amplifier to be closed, and the first gain amplifier works.

The optical splitter divides the received signal light into two beams, including: the first sub received signal light and the second sub received signal light. The first sub-received signal light is used for signal transmission, and the second sub-received signal light is used for optical power monitoring. The optical power detector converts the optical power into a power current signal, and the first gain amplifier amplifies the power current signal for the first time to form a primary gain current signal. The second gain amplifier performs secondary amplification on the primary gain current signal to form a secondary gain current signal. The analog-to-digital converter receives the secondary gain current signal and converts the secondary gain current signal into a current power value, and the analog-to-digital converter is also connected with the MCU through an IIC signal line and writes the power value into an MCU internal register. And the upper computer acquires the power value stored in the register in a polling mode. An optical power limit value is preset in the MCU, and the current power value is smaller than the optical power limit value, so that the control chip controls the first gain amplifier and the second gain amplifier to be started; when the current power value is larger than or equal to the light power limit value, the control chip controls the second gain amplifier to be closed, and the first gain amplifier works.

The analog-to-digital converter receives the secondary gain current signal and converts the secondary gain current signal into a current power value, and writes the current light power value into the MCU. And presetting a light power limit value in a control chip of the MCU, and if the current power value is smaller than the light power limit value, controlling the first gain amplifier and the second gain amplifier to be simultaneously started by the control chip. When the current power value is smaller than the optical power limit value, the limit value of optical power detection is close to, and in order to avoid influencing the normal work of the optical receiving device, the control chip controls the first gain amplifier and the second gain amplifier to be simultaneously started, and under the condition that the amplification factors of the first gain amplifier and the second gain amplifier are not changed, the integral amplification factor is increased compared with the single use of the first gain amplifier, so that the lower limit value reported by the optical power is reduced.

If the current power value is larger than or equal to the light power limit value, the control chip controls the second gain amplifier to be closed, and the first gain amplifier works. When the current power value is greater than or equal to the optical power limit value, the limit value of optical power detection is close to, in order to avoid influencing the normal work of the optical receiving device, the control chip controls the first gain amplifier to be opened, the second gain amplifier is closed, and under the condition that the amplification factors of the first gain amplifier and the second gain amplifier are not changed, the integral amplification factor is reduced compared with the condition that the first gain amplifier and the second gain amplifier are jointly used, so that the upper limit value reported by the optical power is improved.

Therefore, the light power limit value is preset in the MCU, the current power value is smaller than the light power limit value, and the control chip controls the first gain amplifier and the second gain amplifier to be simultaneously started; when the current power value is larger than or equal to the optical power limit value, the control chip controls the second gain amplifier to be closed, the first gain amplifier works, the optical power reporting range is increased, the reporting precision is improved, the optical power range received by the receiving end of the optical module is increased, and the application range of the optical module is improved.

Fig. 10 is a schematic diagram of another light-receiving device according to an example of the present application, and as shown in fig. 10, the light-receiving device is provided with an optical power detector, a logarithmic amplifier, and an analog-to-digital converter. The second sub-receiving signal light enters the optical power detector, the optical power is converted into a power current signal, and the power current signal is amplified by the logarithmic amplifier to form an amplified current signal. The analog-to-digital converter receives the secondary gain current signal and converts the secondary gain current signal into a current power value, and the analog-to-digital converter is also connected with the MCU through an IIC signal line and writes the power value into an MCU internal register. And the upper computer collects the power value stored in the register in a polling mode.

The logarithmic amplifier is an amplifying circuit with the logarithmic function relationship between the amplitude of an output signal and the amplitude of an input signal. The logarithmic amplifier has linear and logarithmic amplification functions, and is a linear amplifier with larger gain when an input signal is weak; when the input signal is strong, it becomes a logarithmic amplifier, and the gain decreases as the input signal increases.

In this example, the logarithmic amplifier has a wide gain dynamic range, and can cover the optical power range of the light reception advancing, and the situation that the optical power is small and cannot be identified or the optical power is too large and cannot be identified can not occur; the reporting range of the optical power is increased, the reporting precision is improved, the range of the optical power received by the receiving end of the optical module is increased, and the application range of the optical module is improved.

Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.

It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the phrases "comprising a" \8230; "defining an element do not exclude the presence of additional like elements in a circuit structure, article, or device comprising the element.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

The above-described embodiments of the present application do not limit the scope of the present application.

Claims (8)

1. A light receiving device characterized by comprising:

a receiving optical fiber adapter for receiving external signal light;

the optical splitter is positioned on the light emitting path of the receiving optical fiber adapter and divides the signal light into first sub-signal light and second sub-signal light;

the optical power detector is positioned on a second light splitting optical path of the light splitter and converts the optical power of the second sub-signal light into a current signal;

the input end of the first gain amplifier is connected with the optical power detector;

the input end of the second gain amplifier is connected with the output end of the first gain amplifier;

the analog-to-digital converter is connected with the output end of the second booster, converts the amplified current signal into a current power value and writes the current power value into the MCU;

control chip, the input with MCU connects, and the output includes: the first output pin is connected with the input end of the second gain amplifier;

a second output pin connected with the output of the second gain amplifier;

when the current power value is smaller than a preset power limit value, the first output pin and the second output pin are disconnected;

and when the current power value is greater than or equal to a preset power limit value, the first output pin and the second output pin are in short circuit.

2. The light-receiving device according to claim 1, wherein the control chip is provided inside the MCU.

3. The light-receiving device according to claim 2, wherein the MCU comprises: the data storage area is connected with the analog-to-digital converter and is used for storing the current power value and a preset power limit value;

the control chip is used for controlling the second gain amplifier to work when the current power value is smaller than the limit value;

and controlling the second gain amplifier to be closed when the current power value is greater than or equal to the limit value.

4. A light receiving device according to claim 3, further comprising: and the golden finger is connected with the MCU and used for reading the current power value stored in the MCU.

5. The light-receiving device according to claim 1, wherein the analog-to-digital converter is provided inside the MCU;

the control chip is arranged in the MCU.

6. The light-receiving device according to claim 1, further comprising: the light receiving chip is positioned on a first light-emitting optical path of the optical splitter and used for converting the first sub-signal light into signal current;

and the transimpedance amplification chip is connected with the light receiving chip and is used for converting the signal current into signal voltage and amplifying the signal voltage.

7. An optical module characterized by the light-receiving device described in any one of claims 1 to 6.

8. The light module of claim 7, further comprising: the circuit board, MCU with adc sets up on the circuit board.

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