CN111755944A - Laser circuit, laser control method and optical network unit - Google Patents
Laser circuit, laser control method and optical network unit Download PDFInfo
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- CN111755944A CN111755944A CN202010561371.2A CN202010561371A CN111755944A CN 111755944 A CN111755944 A CN 111755944A CN 202010561371 A CN202010561371 A CN 202010561371A CN 111755944 A CN111755944 A CN 111755944A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
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Abstract
The embodiment of the application provides a laser circuit, a laser control method and an optical network unit, wherein the laser circuit comprises: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; the power supply is connected with the anode of the laser and is used for supplying luminous current to the laser; the first branch circuit is connected with the negative electrode of the laser and used for enabling the laser to emit light based on the light-emitting current when the optical network unit is in a burst starting state; the second branch circuit is connected in parallel with the first branch circuit and used for providing stable current for the laser when the first branch circuit is disconnected, wherein the stable current is smaller than the light-emitting current, and the laser does not emit light under the action of the stable current.
Description
Technical Field
The present application relates to the field of optical communication technology, and relates to, but is not limited to, a laser circuit, a laser control method, and an optical network unit.
Background
A transmitting end of an Optical Network Unit (ONU) module in a Time and Wavelength Division multiplexing passive Optical Network (TWDM-PON) needs to have functions of Wavelength Division multiplexing and Time Division multiplexing at the same Time, which is the first Time in an access Network. Under the condition that an ONU light source is suddenly turned on, the temperature of an ONU internal laser is increased, so that the red shift of the working Wavelength of the laser is caused, and the Wavelength interval of a Dense Wavelength Division Multiplexing (DWDM) system is usually 100GHz, so that an optical signal is transmitted into an adjacent DWDM channel by the red shift of the Wavelength of the ONU internal laser, crosstalk is formed, and the communication quality is reduced.
Disclosure of Invention
In view of this, embodiments of the present application provide a laser circuit, a laser control method, and an optical network unit.
The technical scheme of the application is realized as follows:
in a first aspect, an embodiment of the present application provides a laser circuit, which is applied to an optical network unit, where the laser circuit includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit;
the power supply is connected with the anode of the laser and is used for supplying luminous current to the laser;
the first branch circuit is connected with the negative electrode of the laser and used for enabling the laser to emit light based on the light-emitting current when the optical network unit is in a burst starting state;
the second branch circuit is connected in parallel with the first branch circuit and used for providing stable current for the laser when the first branch circuit is disconnected, wherein the stable current is smaller than the light-emitting current, and the laser does not emit light under the action of the stable current.
In some embodiments, the first leg comprises: a first burst switch;
the first burst switch is connected with a negative electrode of the laser and used for enabling the laser to emit light based on the light emitting current when the optical network unit is in the burst-on state.
In some embodiments, the first branch further comprises: a laser driver;
the laser driver is connected in series with the first burst switch, and the laser driver is used for controlling the light-emitting current flowing through the laser when the first burst switch is closed.
In some embodiments, the optical network unit comprises: a burst on state and a burst off state;
when the optical network unit is in the burst open state, the first burst switch is in a closed state;
and when the optical network unit is in the burst off state, the first burst switch is in an on state.
In some embodiments, the second branch comprises: a second burst switch and a current module;
the current module is connected in series with the second burst switch, and the current module is used for providing the stable current for the laser when the second burst switch is closed.
In some embodiments, the optical network unit comprises: a burst on state and a burst off state;
when the optical network unit is in the burst-on state, the second burst switch is in an on state;
and when the optical network unit is in the burst off state, the second burst switch is in an off state.
In some embodiments, the current module comprises: a current source;
one end of the current source is connected with the negative electrode of the laser through the second burst switch, the other end of the current source is grounded, and the current source is used for providing the stable current for the laser when the second burst switch is switched off.
In some embodiments, the current module comprises: a resistance;
one end of the resistor is connected with the negative electrode of the laser through the second burst switch, the other end of the resistor is grounded, and the resistor is used for providing the stable current for the laser when the second burst switch is switched off.
In a second aspect, an embodiment of the present application provides a laser control method, which is applied to a laser control circuit, where the laser control circuit includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; the method comprises the following steps:
when the first branch circuit is conducted, the power supply provides light-emitting current for the laser, and the first branch circuit controls the laser to emit light;
when the first branch circuit is disconnected, a stable current is provided for the laser through the second branch circuit so as to control the laser not to emit light under the action of the stable current, wherein the stable current is smaller than the light emitting current.
In a third aspect, an embodiment of the present application provides an optical network unit, which at least includes: a laser circuit;
the laser circuit includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit;
the power supply is connected with the anode of the laser and is used for supplying luminous current to the laser;
the first branch circuit is connected with the negative electrode of the laser and used for enabling the laser to emit light based on the light-emitting current when the optical network unit is in a burst starting state;
the second branch circuit is connected in parallel with the first branch circuit and used for providing stable current for the laser when the first branch circuit is disconnected, wherein the stable current is smaller than the light-emitting current, and the laser does not emit light under the action of the stable current.
The embodiment of the application provides a laser circuit, a laser control method and an optical network unit, wherein the laser circuit comprises: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; because the laser can emit light based on the light-emitting current provided by the power supply when the optical network unit is in the burst-on state through the first branch circuit, and the stable current is provided for the laser by adopting the second branch circuit connected with the first branch circuit in parallel when the first branch circuit is disconnected, in this way, when the optical network unit is in the burst-off state, the current still flows through the laser, and a certain amount of heat is still generated in the laser, so that the wavelength drift amount of the optical network unit in the burst-on state can be reduced.
Drawings
In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having different letter suffixes may represent different examples of similar components. The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments discussed herein.
Fig. 1 is a schematic diagram illustrating a change of a wavelength when a light source is suddenly turned on in a time and wavelength division multiplexing passive optical network in the related art;
FIG. 2 is a circuit diagram of a laser in burst state in the related art;
fig. 3 is an alternative circuit diagram of a laser circuit provided in an embodiment of the present application;
fig. 4 is an alternative circuit diagram of a laser circuit provided by an embodiment of the present application;
fig. 5 is an alternative circuit diagram of a laser circuit provided by an embodiment of the present application;
fig. 6 is an alternative circuit diagram of a laser circuit provided by an embodiment of the present application;
fig. 7 is an alternative flowchart of a laser control method according to an embodiment of the present disclosure;
fig. 8 is an alternative schematic structural diagram of an optical network unit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
In the following description, suffixes such as "module" or "unit" used to denote elements are used only for facilitating the explanation of the present application, and have no specific meaning in themselves. Thus, "module" or "unit" may be used mixedly.
Prior to further detailed description of the embodiments of the present application, related art will be further described.
As the demand for information transmission bandwidth has been increasing at an explosive rate, higher requirements are necessarily placed on network traffic and multi-service support at the access network level. At present, an access Network mainly takes a Passive Optical Network (PON) technology with a tree structure as a main technology, and a Time division multiplexing-Passive Optical Network (TDM-PON) based on Time division multiplexing is widely applied. Ethernet Passive Optical Network (EPON) and Gigabit-capable Passive Optical Network (GPON) technologies are currently The main means for building Optical Fiber directly To Home (Fiber To The Home, FTTH) networks. But have not been able to accommodate the information rate requirements of current access networks. For this reason, the next-generation PON technology is receiving wide attention.
At present, the technical evolution of the Next Generation Passive Optical Network (NG-PON) mainly includes 3 aspects: 1. the single wavelength speed is improved; 2. wavelength division multiplexing technology; 3. orthogonal frequency division multiplexing techniques. The above 3 technologies can effectively solve the bandwidth bottleneck problem of the future market, but each technology also has a difficult problem to be solved urgently, for example, the first technology for improving the single wavelength rate can cause larger line dispersion; the third orthogonal frequency division multiplexing technology puts new requirements on Digital Signal Processing (DSP) technology; in contrast, the second technique using wavelength division technology has a lower barrier, is easier to implement, and has a relatively low cost. Based on this, a Full Service Access Network (FSAN) peak finally determines a Time and wavelength Division multiplexing Passive Optical Network (TWDM-PON) as a final solution for a next-generation PON product.
Fig. 1 is a schematic diagram illustrating a change of a wavelength when a light source in a time and wavelength division multiplexing passive optical network in the related art is suddenly turned on, as shown in fig. 1, when a laser is turned on, the wavelength of the laser rapidly rises in a short time, and as time goes on, an increasing amplitude of the wavelength of the laser gradually becomes smaller and finally approaches to a stable value. When the ONU is suddenly turned off, the laser is turned off while the laser cools down. And when the burst opening is carried out next time, repeating the above process.
In fig. 1, the wavelength of the laser from the time of 0 to the time of wavelength stabilization is the wavelength drift amount in the whole burst process. The most important reasons for the wavelength drift are: the wavelength of the emitted light of the laser gradually increases with the temperature. Since the heat will gradually build up from the start to the steady state of the laser, the temperature will also increase and eventually reach a state of thermal equilibrium, where the wavelength will also reach a maximum.
Fig. 2 is a circuit diagram of a related art laser in burst, and as shown in fig. 2, a circuit diagram 20 of a related art laser in burst includes: a supply voltage 21 (VCC), a laser 22, a burst switch 23 and a laser driver 24. The supply voltage VCC is a constant positive voltage and is connected to the anode of the laser 22. The Laser Driver 24(Laser Driver) is a driving chip of the Laser and connected to the negative electrode of the Laser 22, and the Laser Driver is used for controlling the current of the Laser. The current direction is from the laser to the driver chip. Between the laser driver 24 and the negative pole of the laser 22, there is a burst switch 23, when the ONU is in a burst-on state, the burst switch 23 is closed, and current flows through the laser 22, causing the laser 22 to emit light; when the ONU is in the burst-off state, the burst switch 23 is turned off, no current flows through the laser 22, and the laser 22 does not emit light.
A laser circuit and a method for controlling a laser are provided which are capable of reducing the amount of wavelength drift of the laser in a burst state.
Fig. 3 is an alternative circuit diagram of a laser circuit provided in an embodiment of the present application, and as shown in fig. 3, the laser circuit 30 includes: a power supply 31, a laser 32, a first branch 33 and a second branch 34; the laser circuit 30 provided in the embodiment of the present application can be applied to an optical network unit or any scenario using an optical network unit.
The power supply 31 is connected to the anode of the laser 32 and is used for supplying a light emitting current to the laser 32.
In some embodiments, the laser 32 may be any one of a tunable laser, a single mode laser, or a digital laser. The light-emitting current is an operating current which can enable the laser to normally operate and emit light, and the light-emitting current is larger than or equal to a light-emitting threshold of the laser.
The first branch 33 is connected to a negative electrode of the laser 32, and configured to enable the laser to emit light based on the light-emitting current when the optical network unit is in a burst-on state.
In some embodiments, the first branch 33 is conductive when the onu is in a burst-on state.
The second branch 34 is connected in parallel with the first branch 33, and is configured to provide a stable current to the laser when the first branch 33 is disconnected, where the stable current is smaller than the light emitting current, and the laser does not emit light under the action of the stable current.
In some embodiments, the optical network unit is in a burst off state when the first branch 33 is disconnected, and the second branch 34 is in a burst on state at this time. The stable current is smaller than the light emitting threshold of the laser, and the laser does not emit light under the action of the stable current and only generates heat.
The laser circuit that this application embodiment provided includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; because the laser can emit light based on the light-emitting current provided by the power supply when the optical network unit is in the burst-on state through the first branch circuit, and the stable current is provided for the laser by adopting the second branch circuit connected with the first branch circuit in parallel when the first branch circuit is disconnected, in this way, when the optical network unit is in the burst-off state, the current still flows through the laser, and a certain amount of heat is still generated in the laser, so that the wavelength drift amount of the optical network unit in the burst-on state can be reduced.
Fig. 4 is an alternative circuit diagram of a laser circuit provided in an embodiment of the present application, and as shown in fig. 4, the laser circuit 30 includes: a power supply 31, a laser 32, a first branch 33 and a second branch 34.
The power supply 31 is connected to the anode of the laser 32 for supplying a light emitting current to the laser.
The first branch 33 is connected to a negative electrode of the laser 32, and configured to enable the laser 32 to emit light based on the light-emitting current when the onu is in a burst-on state.
In some embodiments, the first branch 33 comprises: a first burst switch 331. The first burst switch 331 is connected to a negative electrode of the laser 32, and configured to enable the laser 32 to emit light based on the light emitting current when the optical network unit is in the burst on state.
In some embodiments, the first burst switch 331 may be any one of a knife switch, a pull switch, a ripple switch, or a slide switch.
In some embodiments, the first branch 33 further comprises: a laser driver 332. The laser driver 332 is connected in series with the first burst 331 switch, and the laser driver 332 is configured to control the magnitude of the light emitting current flowing through the laser 32 when the first burst 331 switch is closed.
In some embodiments, the optical network unit comprises: a burst on state and a burst off state; when the optical network unit is in the burst open state, the first burst switch is in a closed state; and when the optical network unit is in the burst off state, the first burst switch is in an on state.
In some embodiments, the second branch 34 is connected in parallel with the first branch 33 composed of the first burst switch 331 and the laser driver 332, and is used for providing a stable current to the laser when the first burst switch 331 is turned off, wherein the stable current is smaller than the light emitting current, and the laser does not emit light under the effect of the stable current.
The laser circuit that this application embodiment provided includes: the laser comprises a power supply, a laser, a first burst switch, a laser driver and a second branch circuit, wherein when the first burst switch is switched off, the power supply provides light-emitting current for the laser, so that the laser emits light; and when the first burst switch is switched off, the second branch circuit provides stable current for the laser, so that when the optical network unit is in a burst off state, current still flows in the laser, and certain heat is still generated in the laser, thereby reducing the wavelength drift amount of the optical network unit in the burst on state.
Fig. 5 is an alternative circuit diagram of a laser circuit provided in an embodiment of the present application, and as shown in fig. 5, the laser circuit 30 includes: a power supply 31, a laser 32, a first branch 33 and a second branch 34.
The power supply 31 is connected to the anode of the laser 32 and is used for supplying a light emitting current to the laser 32.
The first branch 33 is connected to a negative electrode of the laser 32, and configured to enable the laser to emit light based on the light-emitting current when the optical network unit is in a burst-on state.
The second branch 34 includes: a second burst switch 341 and a current module 342. The current module 342 is connected in series with the second burst switch 341, and the current module 342 is configured to provide the stabilized current to the laser 32 when the second burst switch 341 is closed.
In some embodiments, the second burst switch 341 may be any one of a knife switch, a pull switch, a ripple switch, or a slide switch. When the second burst switch is closed, the current of the second branch is provided by the current module 342.
A second branch 34 composed of a second burst switch 341 and a current module 342 is connected in parallel with the first branch 33, and is configured to provide a stable current to the laser 32 when the second burst switch 341 is closed, where the stable current is smaller than the light emitting current, and the laser does not emit light under the action of the stable current.
In some embodiments, the optical network unit comprises: a burst on state and a burst off state; when the optical network unit is in the burst-on state, the second burst switch is in an on state; and when the optical network unit is in the burst off state, the second burst switch is in an off state.
In some embodiments, the current module 342 includes: a current source; one end of the current source is connected with the negative electrode of the laser through the second burst switch, the other end of the current source is grounded, and the current source is used for providing the stable current for the laser when the second burst switch is switched off.
In some embodiments, the current module 342 includes: a resistance; one end of the resistor is connected with the negative electrode of the laser through the second burst switch, the other end of the resistor is grounded, and the resistor is used for providing the stable current for the laser when the second burst switch is switched off.
In some embodiments, the current module may also be another module that can provide a stable current.
The laser circuit that this application embodiment provided includes: the power supply, the laser, the first branch circuit, the second burst switch and the current module can provide light-emitting current for the laser by the power supply when the second burst switch is disconnected, so that the laser emits light; and when the second burst switch is closed, the current module provides stable current for the laser, so that when the optical network unit is in the burst closed state, current still flows in the laser, and certain heat is still generated in the laser, thereby reducing the wavelength drift amount of the optical network unit in the burst open state.
Fig. 6 is an alternative circuit diagram of a laser circuit provided in an embodiment of the present application, and as shown in fig. 6, the laser circuit 60 includes: a supply voltage 61 (corresponding to the power supply 31 in the above-described embodiment), a laser 62 (corresponding to the laser 32 in the above-described embodiment), a burst switch 1 (corresponding to the first burst switch 331 in the above-described embodiment), a laser driver 63 (corresponding to the laser driver 332 in the above-described embodiment), a burst switch 2 (corresponding to the first burst switch 341 in the above-described embodiment), and a current source 64.
The power supply voltage 61 is connected with the positive electrode of the laser 62, the negative electrode of the laser 62 is connected with the burst switch 1, and the other end of the burst switch 1 is connected with the laser driver 63.
The cathode of the laser 62 is further connected to the burst switch 2, the other end of the burst switch 2 is connected to the current source 64, and the other end of the current source 64 is grounded.
In some embodiments, the states of the burst switch 1 and the burst switch 2 closed and opened are opposite, that is, when the burst switch 1 is closed, the burst switch 2 is opened; when the burst switch 1 is opened, the burst switch 2 is closed. When the ONU is in a burst open state, the burst switch 1 is closed, the burst switch 2 is opened, and the power supply voltage 61 provides the working current of the laser 62, so that the laser 62 emits light; when the ONU is in the burst-off state, the burst switch 1 is opened, and the burst switch 2 is closed, at this time, although the laser driver is in the non-operating state (because the burst switch 1 is opened), current still passes through the laser 62 due to the current source 64, but the current flowing through the laser 62 is smaller than the light-emitting threshold of the laser at this time, and therefore, the laser still does not emit light, and does not affect communication. And in this case, a certain amount of heat can still be generated in the laser due to the partial current in the laser. Because the laser generates a certain amount of heat when the ONU is in the burst-off state, when the ONU is in the burst-on state, the initial temperature of the laser is not completely unheated, and the initial wavelength of the laser is longer than the wavelength when the laser is completely unheated, but the termination wavelength of the laser during operation is unchanged.
The embodiment of the application utilizes the pre-heating principle of the laser, so that when the ONU is in a burst off state, the laser generates certain heat, and the temperature of the laser is kept at a higher level instead of not generating heat completely. Thus, when the ONU is suddenly turned on, the initial state has a higher temperature, the wavelength of the laser is higher than that when the ONU is not emitting light at all, and the operating wavelength when the laser is emitting light stably is unchanged, so that the wavelength drift amount of the laser becomes small.
In the embodiment of the application, because the ONUs in the TWDM-PON system adopt a multi-channel design and the wavelength interval between adjacent channels is only 0.8nm, the wavelength of the ONUs is easy to drift from one channel to another channel, so that the system communication fails. By adopting the laser circuit provided by the embodiment of the application, the wavelength drift amount of the ONU in a burst state can be reduced; the laser circuit provided by the embodiment of the application is simple in structure, and the effect of reducing the wavelength drift by about 20% can be achieved only by adding some designs on the circuit.
Fig. 7 is an optional schematic flowchart of a laser control method according to an embodiment of the present disclosure, where the laser control method is applied to a laser circuit, where the laser circuit includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; the first branch includes: a first burst switch and a laser driver; the second branch circuit includes: a second burst switch and a current module; the laser circuit is applied to an optical network unit; as shown in fig. 7, the method comprises the steps of:
step S701 determines whether the first branch is on.
In some embodiments, a control system inside the ONU determines whether the first branch in the laser circuit is on, where the first branch is on by determining whether the first burst switch is closed or by determining whether the second burst switch is closed. When the first branch is on, step S702 is executed, and when the first branch is off, step S703 is executed.
Step S702, when the first branch is turned on, a light emitting current is provided to the laser through the power supply, and the laser is controlled to emit light through the first branch.
Step S703, when the first branch is disconnected, providing a stable current to the laser through the second branch to control the laser not to emit light under the action of the stable current, where the stable current is smaller than the light-emitting current.
According to the laser control method provided by the embodiment of the application, when the first branch is switched on, the power supply can provide the laser with the light-emitting current, the first branch is used for controlling the laser to emit light, and when the first branch is switched off, the second branch is used for providing the laser with the stable current, so that when the optical network unit is in the burst off state, the current still flows through the laser, a certain amount of heat is still generated in the laser, and the wavelength drift amount of the optical network unit in the burst on state can be reduced.
Fig. 8 is an optional schematic structural diagram of an optical network unit provided in an embodiment of the present application, and as shown in fig. 8, an optical network unit 80 at least includes: a laser circuit 30; the laser circuit 30 includes: a laser 32, a power supply 31, a first branch 33 and a second branch 34.
The power supply 31 is connected to the anode of the laser 32 and is used for supplying a light emitting current to the laser 32.
The first branch 33 is connected to a negative electrode of the laser 32, and configured to enable the laser to emit light based on the light-emitting current when the optical network unit is in a burst-on state.
The second branch 34 is connected in parallel with the first branch 33, and is configured to provide a stable current to the laser when the first branch 33 is disconnected, where the stable current is smaller than the light emitting current, and the laser does not emit light under the action of the stable current.
In some embodiments, the first branch 33 comprises: a first burst switch; the first burst switch is connected with a negative electrode of the laser and used for enabling the laser to emit light based on the light emitting current when the optical network unit is in the burst-on state.
In some embodiments, the first branch 33 further comprises: a laser driver; the laser driver is connected in series with the first burst switch, and the laser driver is used for controlling the light-emitting current flowing through the laser when the first burst switch is closed.
In an embodiment of the present application, the optical network unit includes: a burst on state and a burst off state; when the optical network unit is in the burst open state, the first burst switch is in a closed state; and when the optical network unit is in the burst off state, the first burst switch is in an on state.
In some embodiments, the second branch 34 comprises: a second burst switch and a current module; the current module is connected in series with the second burst switch, and the current module is used for providing the stable current for the laser when the second burst switch is closed.
In an embodiment of the present application, the optical network unit includes: a burst on state and a burst off state; when the optical network unit is in the burst-on state, the second burst switch is in an on state; and when the optical network unit is in the burst off state, the second burst switch is in an off state.
In some embodiments, the current module comprises: a current source; one end of the current source is connected with the negative electrode of the laser through the second burst switch, the other end of the current source is grounded, and the current source is used for providing the stable current for the laser when the second burst switch is switched off.
In some embodiments, the current module comprises: a resistance; one end of the resistor is connected with the negative electrode of the laser through the second burst switch, the other end of the resistor is grounded, and the resistor is used for providing the stable current for the laser when the second burst switch is switched off.
In the embodiment of the present application, the implementation function of the laser circuit in the optical network unit is the same as the process and implementation function of the laser circuit in the foregoing embodiment.
In some embodiments, the optical network unit 80 further includes another module 81, where the other module 81 is used to implement other functions of the optical network unit, and in this embodiment, the functions of the other module are not limited.
The optical network unit 80 provided in the embodiment of the present application at least includes: a laser circuit; the laser circuit includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; because the laser can emit light based on the light-emitting current provided by the power supply when the optical network unit is in the burst-on state through the first branch circuit, and the stable current is provided for the laser by adopting the second branch circuit connected with the first branch circuit in parallel when the first branch circuit is disconnected, in this way, when the optical network unit is in the burst-off state, the current still flows through the laser, and a certain amount of heat is still generated in the laser, so that the wavelength drift amount of the optical network unit in the burst-on state can be reduced.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit. Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The methods disclosed in the several method embodiments provided in the present application may be combined arbitrarily without conflict to obtain new method embodiments.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A laser circuit for use in an optical network unit, the circuit comprising: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit;
the power supply is connected with the anode of the laser and is used for supplying luminous current to the laser;
the first branch circuit is connected with the negative electrode of the laser and used for enabling the laser to emit light based on the light-emitting current when the optical network unit is in a burst starting state;
the second branch circuit is connected in parallel with the first branch circuit and used for providing stable current for the laser when the first branch circuit is disconnected, wherein the stable current is smaller than the light-emitting current, and the laser does not emit light under the action of the stable current.
2. The circuit of claim 1, wherein the first branch comprises: a first burst switch;
the first burst switch is connected with a negative electrode of the laser and used for enabling the laser to emit light based on the light emitting current when the optical network unit is in the burst-on state.
3. The circuit of claim 2, wherein the first branch further comprises: a laser driver;
the laser driver is connected in series with the first burst switch, and the laser driver is used for controlling the light-emitting current flowing through the laser when the first burst switch is closed.
4. The circuit of claim 3, wherein the optical network unit comprises: a burst on state and a burst off state;
when the optical network unit is in the burst open state, the first burst switch is in a closed state;
and when the optical network unit is in the burst off state, the first burst switch is in an on state.
5. The circuit of claim 1, wherein the second branch comprises: a second burst switch and a current module;
the current module is connected in series with the second burst switch, and the current module is used for providing the stable current for the laser when the second burst switch is closed.
6. The circuit of claim 5, wherein the optical network unit comprises: a burst on state and a burst off state;
when the optical network unit is in the burst-on state, the second burst switch is in an on state;
and when the optical network unit is in the burst off state, the second burst switch is in an off state.
7. The circuit of claim 5, wherein the current module comprises: a current source;
one end of the current source is connected with the negative electrode of the laser through the second burst switch, the other end of the current source is grounded, and the current source is used for providing the stable current for the laser when the second burst switch is switched off.
8. The circuit of claim 5, wherein the current module comprises: a resistance;
one end of the resistor is connected with the negative electrode of the laser through the second burst switch, the other end of the resistor is grounded, and the resistor is used for providing the stable current for the laser when the second burst switch is switched off.
9. A laser control method is applied to a laser control circuit, and the laser control circuit comprises the following steps: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit; the method comprises the following steps:
when the first branch circuit is conducted, the power supply provides light-emitting current for the laser, and the first branch circuit controls the laser to emit light;
when the first branch circuit is disconnected, a stable current is provided for the laser through the second branch circuit so as to control the laser not to emit light under the action of the stable current, wherein the stable current is smaller than the light emitting current.
10. An optical network unit, characterized by comprising at least: a laser circuit;
the laser circuit includes: the device comprises a laser, a power supply, a first branch circuit and a second branch circuit;
the power supply is connected with the anode of the laser and is used for supplying luminous current to the laser;
the first branch circuit is connected with the negative electrode of the laser and used for enabling the laser to emit light based on the light-emitting current when the optical network unit is in a burst starting state;
the second branch circuit is connected in parallel with the first branch circuit and used for providing stable current for the laser when the first branch circuit is disconnected, wherein the stable current is smaller than the light-emitting current, and the laser does not emit light under the action of the stable current.
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| CN202010561371.2A CN111755944A (en) | 2020-06-18 | 2020-06-18 | Laser circuit, laser control method and optical network unit |
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Application publication date: 20201009 |