CN102752676B - EPON and optical module for optical network unit thereof - Google Patents
EPON and optical module for optical network unit thereof Download PDFInfo
- Publication number
- CN102752676B CN102752676B CN201210242055.4A CN201210242055A CN102752676B CN 102752676 B CN102752676 B CN 102752676B CN 201210242055 A CN201210242055 A CN 201210242055A CN 102752676 B CN102752676 B CN 102752676B
- Authority
- CN
- China
- Prior art keywords
- laser
- optical module
- voltage
- onu
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0282—WDM tree architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
-
- 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
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
-
- 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
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
- H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computing Systems (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of EPON and optical module for optical network unit thereof, described optical-fiber network comprises: OLT, a WDM, the 2nd WDM, multiple ONU optical module; Wherein, the laser emission element in ONU optical module comprises CML laser and drive circuit thereof; The drive circuit of laser emission element, in order to receive the signal of telecommunication of ONU system equipment transmission, drives CML laser to launch the light signal of specific wavelength according to the signal of telecommunication received; The wavelength of the light signal that different ONU optical module is launched is different; Described OLT comprises multiple laser pick-off unit, respectively in order to receive the light signal of often kind of wavelength, and sends to switch after the light signal of reception is converted to the signal of telecommunication.Because the CML laser adopted in ONU optical module has more excellent spectral characteristic, thus reduce channel spacing, reach the object more up channels being provided, improving system bandwidth.
Description
Technical field
The present invention relates to Fibre Optical Communication Technology, particularly relate to a kind of EPON and optical module for optical network unit thereof.
Background technology
In EPON as shown in Figure 1, OLT(Optical Line Terminator, optical line terminal) be usually arranged on the central office of the access net system of optical fiber telecommunications system, OLT is responsible for that the electrical signal data in switch is converted into optical signal data and sends, and receive the outside light signal sent, be translated into the signal of telecommunication and flow to switch.OLT is by ODN(light feeder network) with ONU(opticalnet unit, optical network unit) optical module is connected, ONU optical module is arranged on local side usually, i.e. user side or building; Splitter generally has 2N to divide equally port for " optical splitter ", if the light intensity of input port is 1, then the light intensity of each output port is 1/N.For a multi-plexing light accessing system, be generally that 1 OLT is placed on telecommunication center office, then by optical splitter, be at least generally 1 point 32, or 1 point 64 even 1 point 128, namely 1 OLT is with 32 or 64 or 128 ONU optical modules.Each ONU optical module is connected with an ONU system equipment, is sent to OLT in the upstream direction in order to the signal of telecommunication of ONU system equipment is converted to light signal.
Along with various from media, as the continuous growth of the business demand such as microblogging, YuTobe, industrial circle is recognized gradually, existing EPON(Ethernet Passive Optical Network, Ethernet passive optical network) and GPON(Gigabit Passive Optical Network, gigabit passive optical network) technology is all difficult to the demand meeting business long-run development, particularly in Fiber-To-The-Building (FTTB) and Fiber-To-The-Node (FTTN) scene.Optical access network all faces new upgrade requirement in bandwidth, service supporting capacity and access node apparatus function and performance etc.According to analysis, in existing optical-fiber network user to the demand of upstream bandwidth at rapid growth.
Although but adopt multiple technologies means in expanded downstream bandwidth in the EPON of prior art, but the ONU optical module remained on the up direction of signal in optical-fiber network all adopts the light signal of a wavelength to carry out Signal transmissions, that is, each ONU optical module in optical-fiber network has to adopt time-multiplexed mode reflex up channel.Suppose that the signal transmission rate of up direction is 20.3125Gbps, when 1 OLT is with 128 ONU optical modules, 128 multiplexing up channels of ONU optical module, each ONU optical module then can only be assigned the speed of 10.3125 × 1/128Gbps, and the bandwidth of distribution is very limited.
Although have in the industry 20G PON technology and WDM technology at present, in conjunction with composition TWDM PON technology, the capacity of further raising system, solves the demand of the network bandwidth dilatation grown with each passing day.But, current this WDM PON technology is only multiplexing (all-wave 16 wavelength of the limited wavelength based on CWDM, general 4 wavelength only having used 1320 wave bands), even if introduce DWDM technology, be limited by the restriction of the characteristic such as spectrum width and the drift of wavelength temperature of externally modulated laser, channel spacing also just controls at 200GHz interval (C-band 45 channels).
Therefore, existing optical-fiber network can not provide enough upstream channel bandwidths, cannot meet growing business demand.
Summary of the invention
The embodiment provides a kind of EPON and optical module for optical network unit thereof, in order to improve the bandwidth of the up direction of optical-fiber network and ONU optical module.
According to an aspect of the present invention, provide a kind of EPON, comprising: optical line terminal optical module OLT, first wave division multiplexer WDM, Second Wave division multiplexer WDM, multiple ONU optical module;
Wherein, the laser emission element in described ONU optical module comprises CML laser and drive circuit thereof; The drive circuit of described laser emission element, in order to receive the signal of telecommunication of ONU system equipment transmission, drives described CML laser to launch the light signal of specific wavelength according to the signal of telecommunication received; The wavelength of the light signal that different ONU optical module is launched is different;
The light signal that each ONU optical module is launched is coupled to optical fiber through a WDM, through optical fiber, the second WDM transmission to described OLT;
For the light signal of the different wave length that ONU optical module is launched, described OLT comprises multiple laser pick-off unit, respectively in order to receive the light signal of often kind of wavelength, and sends to switch after the light signal of reception is converted to the signal of telecommunication.
Preferably, the wavelength of the light signal of described ONU optical module transmitting is positioned at C-band or L-band;
Between the light signal that different ONU optical modules is launched, minimum frequency interval is 50GHz.
The number of described ONU optical module is m, and the wavelength of the light signal that each ONU optical module is launched is all not identical, and the laser pick-off unit number in described OLT is m; And described optical-fiber network adopts point-to-point mode to carry out signal uplink transmission; Wherein, m is natural number.
Or the number of described ONU optical module is the light signal that f, f ONU optical module launches g kind different wave length; And
Described OLT comprises g laser pick-off unit, receives the light signal of g kind different wave length respectively;
Described optical-fiber network adopts multiple spot to carry out signal uplink transmission to a point mode;
Wherein, f is natural number, and g is the natural number being less than f and being more than or equal to f/2.
Preferably, described optical-fiber network, also comprises: array waveguide grating AWG;
The uplink port of described AWG is connected with a WDM, and each downlink port of described AWG connects an ONU optical module respectively; The light signal that each ONU optical module is launched is sent to a WDM through each downlink port of described AWG, is coupled to optical fiber, is sent to described OLT through optical fiber, the 2nd WDM through a WDM.
According to another aspect of the present invention, additionally provide a kind of optical module for optical network unit, comprising laser emission element, it is characterized in that,
Described laser emission element comprises CML laser and drive circuit thereof; The drive circuit of described laser emission element is in order to receive the signal of telecommunication of ONU system equipment transmission, and the signal of telecommunication according to receiving drives described CML laser to carry out Laser emission.
Preferably, the bias current of described drive circuit provides pin to be connected by the negative electrode of inductance with the laser emitting diode in described CML laser; A modulated current of described drive circuit provides pin to be connected by the negative electrode of the first resistance with the laser emitting diode in described CML laser.
Another modulated current of described drive circuit provides pin to be connected by the anode of the second resistance with the laser emitting diode in described CML laser, and the second resistance and the first resistors match.
Described drive circuit, also for monitoring the electric current flowing through the built-in PD pipe of described CML laser, outputting to the bias current of described CML laser, ensureing the light power stabilising that laser exports according to the electric current adjustment of monitoring.
Further, described optical module also comprises:
Temperature-compensation circuit, in order to the change of the resistance according to the built-in thermocouple of described CML laser, regulation output is to the temperature regulation voltage of the built-in TEC of described CML laser.
Wherein, described temperature-compensation circuit specifically comprises:
Bleeder circuit, the thermocouple built-in with described CML laser is connected;
Normal voltage output circuit, in order to outputting standard voltage on the thermocouple of described bleeder circuit and series connection with it;
Voltage comparator circuit, an one voltage input end, is connected with the tie point of described bleeder circuit with described thermocouple, in order to obtain the voltage on described bleeder circuit, another voltage input end access reference voltage; Described voltage comparator circuit compares the voltage of two voltage input ends, obtains both voltage differences, voltage difference is exported from its output;
Voltage regulator circuit, its input is connected with the output of described voltage comparator circuit, according to the voltage difference that described voltage comparator circuit exports, the described temperature regulation voltage regulating its output to export.
Further, described optical module also comprises:
Centre wavelength regulating circuit, in order to receive control command, the control command according to receiving exports corresponding voltage as described reference voltage another voltage input end to described voltage comparator circuit.
The circuit board of described optical module is divided into mainboard and subplate;
Described CML laser and drive circuit thereof are arranged on described mainboard, and described temperature-compensation circuit and centre wavelength regulating circuit are arranged on described subplate;
Or described temperature-compensation circuit specifically comprises:
Laser temperature determining unit, for measuring resistance or the voltage of the built-in thermocouple of described CML laser, calculates the current temperature value of described CML laser according to measurement result; And according to the difference between the current temperature value calculated and desired temperature, increase or reduce the regulation voltage of output;
Temperature regulation voltage output circuit, for receiving the regulation voltage that laser temperature determining unit 1201 exports, the regulation voltage according to receiving exports corresponding electric current as described temperature regulation voltage.
Preferably, described optical module adopts SFP packing forms, and its pin definitions is mutually compatible with the pin definitions of existing ONU optical module.
Further, described optical module also comprises:
Laser pick-off unit, in order to receive the downlink optical signal in EPON, and is converted to the signal of telecommunication by the light signal of reception and sends to ONU system equipment.
Laser emission element in the ONU optical module of the embodiment of the present invention is owing to adopting CML laser, can spectrum width be controlled at below 0.2nm, and by radiative spectrum-stable locked mode on the wavelength lattice point of ITU-T, there is more excellent spectral characteristic, thus the light signal that ONU optical module is launched can reach the effect that spectrum width is narrower, center wavelength shift is less; Like this, the frequency interval of different ONU optical module transmitting uplink optical signals can be less, thus can hold more up channel in optical-fiber network, thus improve the bandwidth in optical network uplink direction; Meanwhile, the quantity of the ONU optical module of multiplexing same up channel can also be reduced, the upstream bandwidth of each ONU optical module is also improved.
Further, the ONU optical module of the embodiment of the present invention additionally uses temperature-compensation circuit, and the centre wavelength of the laser that CML laser is launched is avoided being subject to the impact of temperature and produces larger skew, ensures the stability of the centre wavelength of the laser launched.
Further, the ONU optical module of the embodiment of the present invention additionally uses centre wavelength regulating circuit, can regulate the centre wavelength of the laser that CML laser is launched.The ONU optical module of this adjustable laser center wavelength is compared to the ONU optical module can only launching specific wavelength of prior art, there is better installation, the convenience of maintenance, manufacturer or operator need not carry out unified planning to the ONU optical module launching different wave length, but produce, unified ONU optical module is installed, make it according to field demand is adjusted the laser launching required wavelength.Thus greatly reduce production, installation, maintenance, management cost.
Accompanying drawing explanation
Fig. 1 is the passive optical network structure schematic diagram of prior art;
Fig. 2 is the laser emission element internal structure circuit block diagram in the ONU optical module of the embodiment of the present invention;
Fig. 3 is the structural representation of the EPON of the embodiment of the present invention;
Fig. 4 is the EPON that the point-to-point mode of the embodiment of the present invention carries out signal uplink transmission;
Fig. 5 is the multiple spot of the embodiment of the present invention carries out signal uplink transmission EPON to a point mode;
Fig. 6 is the internal circuit schematic diagram of the CML laser of the embodiment of the present invention;
Fig. 7 is the CML laser of the embodiment of the present invention and the physical circuit figure of drive circuit thereof;
Fig. 8 is a kind of specific implementation circuit block diagram of the temperature-compensation circuit of the embodiment of the present invention;
Fig. 9 is a kind of specific implementation circuit of the temperature-compensation circuit of the embodiment of the present invention;
Figure 10 is the schematic diagram of the pulse modulated wave that the pwm circuit output pulse width of the embodiment of the present invention is larger;
Figure 11 is the schematic diagram of the pulse modulated wave that the pwm circuit output pulse width of the embodiment of the present invention is less;
Figure 12 is the another kind of specific implementation circuit block diagram of the temperature-compensation circuit of the embodiment of the present invention.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in specification are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
The term such as " module " used in this application, " system " is intended to comprise the entity relevant to computer, such as but not limited to hardware, firmware, combination thereof, software or executory software.Such as, module can be, but be not limited in: the thread of the process that processor runs, processor, object, executable program, execution, program and/or computer.
In the EPON of the embodiment of the present invention, different ONU optical modules launches the light signal of different wave length in the upstream direction, namely up direction adopts the mode of wavelength division multiplexing to send signal, and, also reduce the interval between up channel further, thus the capacity of the up channel of expanding system, reach the object improving system uplink bandwidth.For reducing channel spacing, the spectral width reducing laser can be passed through, or the stability improving laser center wavelength realizes.
Therefore, CML(chirp managed laser is adopted in the ONU optical module of the embodiment of the present invention, chirp management laser) as laser, the spectrum of the laser of transmitting is controlled at below 0.2nm, and then sufficient center wavelength accuracy can also be locked on ITU-T lattice point, make the skew of centre wavelength between +/-0.02nm.Like this, just can reduce channel spacing, thus can be network system dilatation, namely more channel is provided, to reach the object improving system bandwidth.
The technical scheme of the embodiment of the present invention is described in detail below in conjunction with accompanying drawing.Laser emission element internal structure circuit block diagram in the ONU optical module of the embodiment of the present invention, as shown in Figure 2, comprising: CML laser 201 and drive circuit 202 thereof.
The signal of telecommunication that drive circuit 202 sends in order to receive ONU system equipment, drives CML laser 201 to launch the laser (light signal) of specific wavelength according to the signal of telecommunication received.
CML(Chirp Managed Laser, chirp management laser) laser, spectrum width can be controlled at below 0.2nm, and by radiative spectrum-stable locked mode on the wavelength lattice point of ITU-T, thus there is more excellent spectral characteristic.
Further, in ONU optical module, also comprise laser pick-off unit, in order to receive the downlink optical signal in EPON, and the light signal of reception is converted to the signal of telecommunication sends to ONU system equipment.Laser pick-off unit in ONU optical module adopts structure conventional in existing passive optical-fiber network, and the circuit be well known to those skilled in the art, repeats no more herein.
The structural representation of the EPON of the embodiment of the present invention as shown in Figure 3, comprise: optical line terminal optical module OLT301, first wave division multiplexer WDM302, Second Wave division multiplexer WDM303, AWG(Arrayed Waveguide Grating, array waveguide grating) the 304, the 2nd AWG305, at least one (multiple) ONU(optical network unit) optical module 305.
In EPON, the number of ONU optical module 305 is multiple; ONU optical module in EPON launches the uplink optical signal of different wave length.ONU optical module 305, after the signal of telecommunication that have received the transmission of ONU system equipment, is converted to light signal (i.e. uplink optical signal) and exports.Particularly, the laser emission element of ONU optical module is after the signal of telecommunication that have received the transmission of ONU system equipment, and (up) light signal signal of telecommunication of reception being converted to specific wavelength exports.The light signal that each ONU optical module exports is coupled to optical fiber through WDM302, and a WDM302 is connected by optical fiber with the 2nd WDM303, and the light signal exported by each ONU optical module is sent to OLT301 through optical fiber, the 2nd WDM303.
For the uplink optical signal of the variant wavelength transmitted in optical fiber, have respectively in OLT301 in order to detection, the laser pick-off unit receiving this wavelength signals, and send to switch after the light signal of reception is converted to the signal of telecommunication.In other words, for the light signal of the variant wavelength that ONU optical module sends, OLT301 comprises multiple laser pick-off unit, respectively in order to receive (up) light signal of often kind of wavelength, and sends to switch after the light signal of reception is converted to the signal of telecommunication.Such as, the wavelength (frequency) of the light signal that the ONU optical module in EPON is launched has n kind, then in OLT301, have n laser pick-off unit to receive the light signal (n is natural number) of the n kind wavelength (frequency) that ONU optical module is launched respectively.
Because the laser emission element in ONU optical module 305 adopts CML laser, can spectrum width be controlled at below 0.2nm, and by radiative spectrum-stable locked mode on the wavelength lattice point of ITU-T, there is more excellent spectral characteristic, thus the light signal that ONU optical module 305 is launched can reach the effect that spectrum width is narrower, center wavelength shift is less; Like this, the frequency interval of different ONU optical module transmitting uplink optical signals can be less, even reaches interval 50GHz.Thus more up channel can be held in optical-fiber network, the quantity of the ONU optical module of multiplexing same up channel can be reduced, the upstream bandwidth of each ONU optical module is improved.
The laser that each laser emission element in optical line terminal optical module OLT301 is launched is coupled in optical fiber through the 2nd WDM303.One WDM302 is connected by optical fiber with the 2nd WDM303, the laser launched by each laser emission element, transmits arrival the 2nd WDM303 in a fiber.
AWG304 is connected by optical fiber with a WDM302, and after the light signal exported via a WDM302 enters into the uplink port of AWG304, the light signal of different wave length is exported by different downlink ports by AWG304 respectively.Each downlink port of AWG304 connects an ONU optical module 305 respectively.
For the situation being provided with AWG304 in EPON, the light signal that each ONU optical module 305 is launched is sent to a WDM302 through each downlink port of AWG304, is coupled to optical fiber, is sent to OLT301 through optical fiber, the 2nd WDM303 through a WDM302.
In addition, the laser that in EPON, each laser emission element of OLT301 is launched is input to optical fiber through a WDM302 coupling, after the light splitting of described Optical Fiber Transmission and described AWG, ONU optical module is outputted to from the port exporting respective wavelength laser, after the light signal of the specific wavelength of reception is converted to the signal of telecommunication by the laser pick-off unit of ONU optical module, the signal of telecommunication of conversion is outputted to ONU system equipment, and ONU system equipment processes the signal of telecommunication.Laser emission element in OLT301 and laser pick-off unit can adopt structure conventional in existing passive optical-fiber network, and the circuit be well known to those skilled in the art, repeats no more herein.
The EPON of the ONU optical module of the application embodiment of the present invention, point-to-point mode can be adopted to carry out signal uplink transmission, and the multiple spot of prior art need not be adopted to carry out the uplink of signal to the mode of a bit, thus considerably increase the upstream bandwidth of each ONU optical module.Certainly, the ONU optical module of the embodiment of the present invention also can be applicable to multiple spot in the EPON of the uplink transmission mode of a bit.
Fig. 4 shows a kind of EPON adopting point-to-point mode to carry out signal uplink transmission; Comprising m ONU optical module (m is natural number), the wavelength of the light signal that each ONU optical module is launched is all not identical, i.e. the light signal of m ONU optical module transmitting m different wave length; Like this, there is in EPON m up channel.Include m laser pick-off unit corresponding m ONU optical module respectively in the olt, wherein, the wavelength of the light signal that the ONU optical module that the wavelength of the light signal of laser pick-off unit reception is corresponding with it is launched is identical.
Suppose that m is 180, then the wavelength (frequency) of the laser (light signal) launched from the 1st optical module for optical network unit to the laser emission element of the 180th optical module for optical network unit is positioned at L-band, as shown in table 1 below:
Table 1
| Optical module for optical network unit | The frequency (THz) of the laser launched | The wavelength (nm) of the laser launched |
| 1st optical module for optical network unit | 195.90 | 1530.33 |
| 2nd optical module for optical network unit | 195.85 | 1530.72 |
| 3rd optical module for optical network unit | 195.80 | 1531.12 |
| ...... | ||
| 178th optical module for optical network unit | 184.60 | 1624.01 |
| 179th optical module for optical network unit | 184.55 | 1624.45 |
| 180th optical module for optical network unit | 184.30 | 1624.89 |
The light signal that optical module for optical network unit different is as can be seen from the above table launched, minimum frequency space can reach 50GHz, wavelength interval can reach 0.4nm, greatly extend the upstream bandwidth in optical-fiber network, and each optical module for optical network unit need not up channel multiplexing with other optical module for optical network unit, therefore, the upstream bandwidth of each optical module for optical network unit also substantially increases.
Certainly, the wavelength of the light signal of ONU optical module transmitting also can be positioned at L-band.
Fig. 5 shows a kind of multiple spot that adopts and carries out the EPON of signal uplink transmission to a point mode; Comprising f ONU optical module (f is natural number), f ONU optical module launches the light signal (g is the natural number being less than f and being more than or equal to f/2) of g kind different wave length.Like this, there is in this EPON g up channel, the multiplexing up channel of maximum two optical module for optical network unit.Include the light signal that g laser pick-off unit receives g kind different wave length respectively in the olt, and send to switch to process after the light signal of reception is converted to the signal of telecommunication.In the EPON of Fig. 5, the multiplexing up channel of maximum two optical module for optical network unit, therefore, compared to prior art, the upstream bandwidth of optical module for optical network unit substantially increases.
Usually above-mentioned laser emission element works in sequential filming pattern, and the laser emission element in ONU optical module then needs to be operated in burst transmissions pattern, to adapt to user and the situation of discontinuous transmission upstream data.If application works in the laser emission element of sequential filming pattern in ONU optical module, then cannot enter the normal transmission that normal operating conditions carries out light signal within shorter time.
Fig. 6 shows the internal circuit schematic diagram of CML laser, and the 1-9 in Fig. 6 represents the external pin after CML individual laser package.As can be seen from Figure 6, the negative electrode of CML laser is exported respectively by a resistance (RF) and inductance (L1) by the 4th pin and the 7th pin.Usually, the bias current that drive circuit provides is all be connected with the 4th pin with the pin of modulated current.The circuit of inventor to prior art is analyzed, find that this connected mode is no problem under being applied in sequential filming pattern, if but under being applied in burst transmissions pattern, then can cause when burst transmissions laser, the bias current that drive circuit provides can consume on the resistance of the 4th pin in a large number within a period of time, thus enough BIAS bias currents cannot be provided for CML laser, laser is normally worked.
Based on above-mentioned analysis, in the laser emission element that the embodiment of the present invention provides, as shown in Figure 7, comprise the laser emitting diode for Emission Lasers, and for the laser acquisition diode of exploring laser light.The bias current of drive circuit provides pin to be connected with the negative electrode (i.e. the negative electrode of laser emitting diode) of described CML laser by inductance (L1 in Fig. 7), and namely the bias current of drive circuit provides pin to be connected with the 7th pin in Fig. 6; The modulated current of described drive circuit provides pin to be connected with the negative electrode (i.e. the negative electrode of laser emitting diode) of described CML laser by resistance (RF in Fig. 7), and namely a modulated current of drive circuit provides pin to be connected with the 4th pin in Fig. 6.To flow away the 7th pin of laser owing to adopting the biased electrical of driver, modulated current walks the mode of the 4th pin of laser, bias current can not consume on the resistance of the 4th pin, modulated current then can not be subject to the iris action of inductance to AC signal, thus be carried on laser, form modulation.
Further, another modulated current of drive circuit provides pin by anode (the i.e. anode of laser emitting diode of another resistance (R4 in Fig. 7) with CML laser, the 3rd pin in Fig. 6) be connected, like this, the modulated current that drive circuit exports forms loop by the 3rd pin in Fig. 6 and the 4th pin, and the resistance (R4) be connected with the 3rd pin can be used for mating the resistance (RF) be connected with the 4th pin, thus realize under laser is normally operated in burst mode.
Further, drive circuit also flows through the built-in PD(of described CML laser detect diode for monitoring) electric current of pipe, output to the bias current of described CML laser according to the electric current adjustment of monitoring, ensure the light power stabilising that laser exports.Particularly, drive circuit can detect by the 6th pin in Fig. 6 the electric current flowing through PD pipe, and current conversion is voltage by built-in resistor by drive circuit, the bias current exported by the magnitude of voltage drive circuit adjustment of this conversion; If the magnitude of voltage of conversion is higher than setting voltage value, then reduce the bias current exported; If the magnitude of voltage of conversion is lower than setting voltage value, then increase output offset electric current; Thus ensure the light power stabilising that CML laser exports, by the impact of temperature etc., luminous power is not drifted about.Setting voltage value can be set according to actual conditions by those skilled in the art.
Further, also can comprise in the ONU optical module of the embodiment of the present invention: temperature-compensation circuit 203.
Temperature-compensation circuit 203 is in order to the change of the resistance according to the built-in thermocouple of described CML laser, and regulation output is to the temperature regulation voltage of the built-in TEC of described CML laser; Be input to the temperature regulation voltage of the built-in TEC of described CML laser, in order to regulate the temperature of described CML laser.
Particularly, a resistance of can connecting with thermocouple outside CML laser, thermocouple and this resistance load a stable voltage; Because the resistance of the built-in thermocouple of CML laser can change along with the change of the temperature in CML laser usually; temperature-compensation circuit 203 is by monitoring the ohmically voltage that CML laser is outer, connect with this thermocouple; the resistance of thermocouple can be recognized, and then recognize the temperature in CML laser.
The temperature regulation voltage that temperature-compensation circuit 203 exports is input to TEC(Thermoelectric cooler built-in in CML laser, semiconductor cooler by the 1st in Fig. 6,2 pins).The voltage difference of TEC according to the 1st, between 2 pins carries out temperature adjustment to CML laser.Therefore, temperature-compensation circuit 203 can by be input to the temperature regulation voltage of CML laser size, positive and negative come temperature in regulating and controlling CML laser.And temperature spot directly affects the centre wavelength of CML laser Output of laser residing for CML laser.In other words, if wish that the center wavelength shift of CML laser Output of laser is little, stable, then the temperature constant of control CML laser is needed.Temperature-compensation circuit 203 is by monitoring the change of the resistance of the built-in thermocouple of described CML laser, thus the temperature monitored in CML laser, and then output to temperature regulation voltage to realize the control to the temperature in CML laser according to the voltage-regulation of the thermocouple of monitoring, keep the temperature in CML laser to remain on certain temperature value.
The block diagram of a kind of specific implementation circuit of temperature-compensation circuit 203 as shown in Figure 8, comprising: voltage comparator circuit 801 and voltage regulator circuit 802, bleeder circuit 803, normal voltage output circuit 804.Illustrate in Fig. 7 that a concrete bleeder circuit 803, Fig. 9 shows the physical circuit of voltage comparator circuit 801, voltage regulator circuit 802, normal voltage output circuit 804.
Bleeder circuit 803 thermocouple built-in with described CML laser is connected; Bleeder circuit 803 can be specifically a resistance, and the resistance R13 of Fig. 7 is bleeder circuit 803: the resistance R13 thermocouple built-in with CML laser is connected, and the normal voltage of 2.5V is loaded on resistance R13 and thermocouple.
Normal voltage output circuit 804 outputting standard voltage is on the thermocouple of described bleeder circuit and series connection with it.The normal voltage that normal voltage output circuit 804 exports can be such as 3V, or the direct voltage of 2.3V, and concrete magnitude of voltage those skilled in the art can set according to actual conditions.U8 MAX8842 chip in Fig. 9 and peripheral cell thereof constitute normal voltage output circuit 804.U8MAX8842 chip is voltage stabilizing circuit chip.The normal voltage that 6th pin of U8 MAX8842 chip outputs 2.5V is loaded into bleeder circuit 803 with on thermocouple.
A voltage input end of voltage comparator circuit 801, the tie point of the thermocouple built-in with CML laser with bleeder circuit 803 is connected, thus can monitor the change of the voltage on thermocouple, or the change of voltage on bleeder circuit 803.Because the resistance of thermocouple can change along with the change of temperature, the voltage on thermocouple also can correspondingly change, and equally, the voltage on bleeder circuit 803 also can correspondingly change; That is, the change of the voltage on bleeder circuit 803, or the change of voltage on thermocouple, reflect the change of the temperature in CML laser.
Another voltage input end access reference voltage of voltage comparator circuit 801.
Voltage comparator circuit 801 compares the voltage of two voltage input ends, obtains both voltage differences, voltage difference is exported from its output.
U7 NCS2001 chip in Fig. 9 and U5 NCS2001 chip and peripheral cell thereof constitute voltage comparator circuit 801.U7 NCS2001 chip and U5 NCS2001 chip are all comparator chip.A voltage input end of the voltage comparator circuit 801 in Fig. 9 is the voltage input pin 3 of U7 NCS2001 chip, another voltage input end of this voltage comparator circuit 801 is the voltage input pin 4 of U5 NCS2001 chip, and the output of this voltage comparator circuit 801 is the voltage output pin 1 of U5 NCS2001 chip.
The input of voltage regulator circuit 802 is connected with the output of voltage comparator circuit 801, and its output TEC built-in with CML laser is connected; The voltage difference that voltage regulator circuit 802 exports according to voltage comparator circuit 801, regulates its output to output to the temperature regulation voltage of TEC.
It is voltage-controlled PWM chip that U6 MAX8521 chip in Fig. 9 and peripheral cell thereof constitute voltage regulator circuit 802, U6MAX8521 chip.The input of voltage regulator circuit 802 is the pin one 0 of U6MAX8521 chip, as can be seen from Figure 9, the input of voltage regulator circuit 802, namely the pin one 0 of U6 MAX8521 chip is connected with the voltage output pin 1 of U5 NCS2001 chip, the voltage that U6MAX8521 chip exports according to voltage comparator circuit 801, carry out the pulse-width modulation of PWM ripple, the PWM ripple after modulation exports from the pin one 8 and 19 of U6 MAX8521 chip; And the pin one 8 of U6 MAX8521 chip with 19 respectively with the 1st pin in TEC-(Fig. 6 of CML laser) with the 2nd pin in TEC+(Fig. 6) be connected, thus by the PWM(Pulse-Width Modulation after modulation, pulse-width modulation) ripple outputs to the TEC of CML laser.
Such as, when needs heat up to CML laser, voltage regulator circuit 802 exports the larger pulse modulated wave of positive peak pulse duration, as shown in Figure 10;
When needs are lowered the temperature to CML laser, voltage regulator circuit 802 exports the larger pulse modulated wave of less, the negative pulsewidth of positive pulsewidth, as shown in figure 11.
Further, also can comprise in the ONU optical module of the embodiment of the present invention: centre wavelength regulating circuit 204.
Centre wavelength regulating circuit 204, in order to receive control command, exports the reference voltage of corresponding voltage as another voltage input end of access voltage comparator circuit 801 according to the control command received.Namely centre wavelength regulating circuit 204 is according to the control command received, and exports corresponding reference voltage.
Centre wavelength regulating circuit 204 specifically can comprise single-chip microcomputer, micro controller, processor etc., centre wavelength regulating circuit 204 specifically can pass through communication port, as communication port USB, RS232 etc. receive control command, also can be received, obtain the control command of engineering staff's setting by the on off state of pin senses.
In fact, centre wavelength regulating circuit 204 export reference voltage and the wavelength of the laser that CML laser is launched between there is corresponding relation; Relation between the wavelength of the reference voltage that centre wavelength regulating circuit 204 exports and the laser that CML laser is launched, technical staff rule of thumb or can test and draw.Such as, rule of thumb or test the corresponding relation that draws and be: when temperature does not change, if the reference voltage that centre wavelength regulating circuit 204 exports increases, voltage difference then between two voltage input ends obtaining of voltage comparator circuit 801 can reduce, thus pwm circuit 802 reduces the pulsewidth of pulse modulated currents, cause the temperature regulation voltage inputting CML laser to reduce, the wavelength of the laser that CML laser is launched is elongated;
When temperature does not change, if the reference voltage that centre wavelength regulating circuit 204 exports reduces, voltage difference then between two voltage input ends obtaining of voltage comparator circuit 801 can increase, thus pwm circuit 802 increases the pulsewidth of pulse modulated currents, cause the temperature regulation voltage inputting CML laser to increase, the wavelength of the laser that CML laser is launched shortens.
Reference voltage corresponding to the wavelength of the laser needing CML laser to launch, after obtaining the relation between reference voltage that centre wavelength regulating circuit 204 exports and the wavelength of laser that CML laser is launched, is preset in centre wavelength regulating circuit 204 by technical staff.If the control command instruction that centre wavelength regulating circuit 204 receives exports the laser of certain wavelength, then centre wavelength regulating circuit 204 exports the reference voltage corresponding with this wavelength.Such as, the control command instruction that centre wavelength regulating circuit 204 receives exports the laser of A wavelength, then centre wavelength regulating circuit 204 output reference voltage A; The control command instruction that centre wavelength regulating circuit 204 receives exports the laser of B wavelength, then centre wavelength regulating circuit 204 output reference voltage B.Centre wavelength regulating circuit 204 can realize by exporting different reference voltage levels the laser that different centre wavelength launched by CML laser.Such as, centre wavelength regulating circuit 204 can pass through the different reference voltage level of output 9, carrys out the laser (light signal) that control ONU optical module launches 9 kinds of different wave lengths.
The block diagram of the another kind of specific implementation circuit of temperature-compensation circuit 203 as shown in figure 12, comprising: laser temperature determining unit 1201, temperature regulation voltage output circuit 1202.
Laser temperature determining unit 1201 can be specifically single-chip microcomputer, the processor with thermocouple resistance measurement function, or has single-chip microcomputer, the processor of voltage measurement function.Laser temperature determining unit 1201 measures resistance or the voltage of the built-in thermocouple of CML laser, the current temperature value of CML laser is calculated according to measurement result, according to the difference between the current temperature value calculated and desired temperature, increase or reduce the regulation voltage of output.Desired temperature is wherein arranged according to actual conditions by those skilled in the art.
Temperature regulation voltage output circuit 1202 receives the regulation voltage that laser temperature determining unit 1201 exports, and the regulation voltage according to receiving exports corresponding voltage as temperature regulation voltage to CML laser.Temperature regulation voltage output circuit 1202 can be specifically voltage-controlled pwm circuit.
The circuit board of the ONU optical module of the embodiment of the present invention is divided into mainboard and subplate; Described CML laser and drive circuit thereof are arranged on described mainboard, described temperature-compensation circuit and centre wavelength regulating circuit are arranged on described subplate, in order to avoid temperature-compensation circuit and centre wavelength regulating circuit introduce interference to CML laser and drive circuit thereof.
Laser emission element in the ONU optical module of the embodiment of the present invention is owing to adopting CML laser, can spectrum width be controlled at below 0.2nm, and by radiative spectrum-stable locked mode on the wavelength lattice point of ITU-T, there is more excellent spectral characteristic, thus the light signal that ONU optical module is launched can reach the effect that spectrum width is narrower, center wavelength shift is less; Like this, the frequency interval of different ONU optical module transmitting uplink optical signals can be less, thus can hold more up channel in optical-fiber network, thus improve the bandwidth in optical network uplink direction; Meanwhile, the quantity of the ONU optical module of multiplexing same up channel can also be reduced, the upstream bandwidth of each ONU optical module is also improved.
Further, the ONU optical module of the embodiment of the present invention additionally uses temperature-compensation circuit, and the centre wavelength of the laser that CML laser is launched is avoided being subject to the impact of temperature and produces larger skew, ensures the stability of the centre wavelength of the laser launched.
Further, the ONU optical module of the embodiment of the present invention additionally uses centre wavelength regulating circuit, can regulate the centre wavelength of the laser that CML laser is launched.The ONU optical module of this adjustable laser center wavelength is compared to the ONU optical module can only launching specific wavelength of prior art, there is better installation, the convenience of maintenance, manufacturer or operator need not carry out unified planning to the ONU optical module launching different wave length, but produce, unified ONU optical module is installed, make it according to field demand is adjusted the laser launching required wavelength.Thus greatly reduce production, installation, maintenance, management cost.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer read/write memory medium, as: ROM/RAM, magnetic disc, CD etc.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. an EPON, comprising: optical line terminal optical module OLT, first wave division multiplexer WDM, Second Wave division multiplexer WDM, multiple ONU optical module;
Wherein, the laser emission element in described ONU optical module comprises CML laser and drive circuit thereof; The drive circuit of described laser emission element, in order to receive the signal of telecommunication of ONU system equipment transmission, drives described CML laser to launch the light signal of specific wavelength according to the signal of telecommunication received; Wherein, the bias current of described drive circuit provides pin to be connected by the negative electrode of inductance with the laser emitting diode in described CML laser; A modulated current of described drive circuit provides pin to be connected by the negative electrode of the first resistance with the laser emitting diode in described CML laser; Another modulated current of described drive circuit provides pin to be connected by the anode of the second resistance with the laser emitting diode in described CML laser, and the second resistance and the first resistors match; The wavelength of the light signal that different ONU optical module is launched is different; And between the light signal launched of different ONU optical modules, minimum frequency interval is 50GHz;
The light signal that each ONU optical module is launched is coupled to optical fiber through a WDM, through optical fiber, the second WDM transmission to described OLT;
For the light signal of the different wave length that ONU optical module is launched, described OLT comprises multiple laser pick-off unit, respectively in order to receive the light signal of often kind of wavelength, and sends to switch after the light signal of reception is converted to the signal of telecommunication.
2. optical-fiber network as claimed in claim 1, is characterized in that, the wavelength of the light signal that described ONU optical module is launched is positioned at C-band or L-band.
3. optical-fiber network as claimed in claim 1, it is characterized in that, the number of described ONU optical module is m, and the wavelength of the light signal that each ONU optical module is launched is all not identical, and the laser pick-off unit number in described OLT is m; And described optical-fiber network adopts point-to-point mode to carry out signal uplink transmission; Wherein, m is natural number.
4. optical-fiber network as claimed in claim 1, is characterized in that, the number of described ONU optical module is the light signal that f, f ONU optical module launches g kind different wave length; And
Described OLT comprises g laser pick-off unit, receives the light signal of g kind different wave length respectively;
Described optical-fiber network adopts multiple spot to carry out signal uplink transmission to a point mode;
Wherein, f is natural number, and g is the natural number being less than f and being more than or equal to f/2.
5. the optical-fiber network as described in as arbitrary in claim 1-4, is characterized in that, also comprise: array waveguide grating AWG;
The uplink port of described AWG is connected with a WDM, and each downlink port of described AWG connects an ONU optical module respectively; The light signal that each ONU optical module is launched is sent to a WDM through each downlink port of described AWG, is coupled to optical fiber, is sent to described OLT through optical fiber, the 2nd WDM through a WDM.
6. an optical module for optical network unit, comprising laser emission element, is characterized in that,
Described laser emission element comprises CML laser and drive circuit thereof; The drive circuit of described laser emission element, in order to receive the signal of telecommunication of ONU system equipment transmission, drives described CML laser to launch the light signal of specific wavelength according to the signal of telecommunication received; Wherein,
The bias current of described drive circuit provides pin to be connected by the negative electrode of inductance with the laser emitting diode in described CML laser; A modulated current of described drive circuit provides pin to be connected by the negative electrode of the first resistance with the laser emitting diode in described CML laser;
Another modulated current of described drive circuit provides pin to be connected by the anode of the second resistance with the laser emitting diode in described CML laser, and the second resistance and the first resistors match;
The wavelength of the light signal that different ONU optical modules is launched is different, and the light signal that described different ONU optical module is launched is coupled to optical fiber through a WDM, through optical fiber, the second WDM transmission to described OLT.
7. optical module as claimed in claim 6, is characterized in that,
Described drive circuit, also for monitoring the electric current flowing through the built-in PD pipe of described CML laser, outputting to the bias current of described CML laser, ensureing the light power stabilising that laser exports according to the electric current adjustment of monitoring.
8. optical module as claimed in claim 6, is characterized in that, also comprise:
Temperature-compensation circuit, in order to the change of the resistance according to the built-in thermocouple of described CML laser, regulation output is to the temperature regulation voltage of the built-in TEC of described CML laser.
9. optical module as claimed in claim 8, it is characterized in that, described temperature-compensation circuit specifically comprises:
Bleeder circuit, the thermocouple built-in with described CML laser is connected;
Normal voltage output circuit, in order to outputting standard voltage on the thermocouple of described bleeder circuit and series connection with it;
Voltage comparator circuit, an one voltage input end, is connected with the tie point of described bleeder circuit with described thermocouple, in order to obtain the voltage on described bleeder circuit, another voltage input end access reference voltage; Described voltage comparator circuit compares the voltage of two voltage input ends, obtains both voltage differences, voltage difference is exported from its output;
Voltage regulator circuit, its input is connected with the output of described voltage comparator circuit, according to the voltage difference that described voltage comparator circuit exports, the described temperature regulation voltage regulating its output to export.
10. optical module as claimed in claim 9, is characterized in that, also comprise:
Centre wavelength regulating circuit, in order to receive control command, the control command according to receiving exports corresponding voltage as described reference voltage another voltage input end to described voltage comparator circuit.
11. optical modules as claimed in claim 10, it is characterized in that, its circuit board is divided into mainboard and subplate;
Described CML laser and drive circuit thereof are arranged on described mainboard, and described temperature-compensation circuit and centre wavelength regulating circuit are arranged on described subplate;
12. optical modules as claimed in claim 8, it is characterized in that, described temperature-compensation circuit specifically comprises:
Laser temperature determining unit, for measuring resistance or the voltage of the built-in thermocouple of described CML laser, calculates the current temperature value of described CML laser according to measurement result; And according to the difference between the current temperature value calculated and desired temperature, increase or reduce the regulation voltage of output;
Temperature regulation voltage output circuit, for receiving the regulation voltage that laser temperature determining unit 1201 exports, the regulation voltage according to receiving exports corresponding electric current as described temperature regulation voltage.
13. as arbitrary in claim 6-12 as described in optical module, it is characterized in that, it adopts SFP packing forms, and its pin definitions is mutually compatible with the pin definitions of existing ONU optical module.
14. as arbitrary in claim 6-12 as described in optical module, it is characterized in that, also comprise:
Laser pick-off unit, in order to receive the downlink optical signal in EPON, and is converted to the signal of telecommunication by the light signal of reception and sends to ONU system equipment.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242055.4A CN102752676B (en) | 2012-07-12 | 2012-07-12 | EPON and optical module for optical network unit thereof |
| PCT/CN2012/081544 WO2014008712A1 (en) | 2012-07-12 | 2012-09-18 | Passive optical network and optical module of optical network unit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210242055.4A CN102752676B (en) | 2012-07-12 | 2012-07-12 | EPON and optical module for optical network unit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102752676A CN102752676A (en) | 2012-10-24 |
| CN102752676B true CN102752676B (en) | 2015-09-30 |
Family
ID=47032536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210242055.4A Active CN102752676B (en) | 2012-07-12 | 2012-07-12 | EPON and optical module for optical network unit thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102752676B (en) |
| WO (1) | WO2014008712A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108306685B (en) * | 2018-01-11 | 2020-08-07 | 青岛海信宽带多媒体技术有限公司 | Optical module and TWDM passive optical network |
| CN111756448B (en) * | 2020-06-09 | 2021-07-23 | 杭州兰特普光电子技术有限公司 | Chirp management method for optical module, optical module and DWDM network |
| CN112423165B (en) * | 2020-11-25 | 2021-08-13 | 电子科技大学 | Large-scale optical switching chip drive control device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200983592Y (en) * | 2006-08-16 | 2007-11-28 | 上海未来宽带技术及应用工程研究中心有限公司 | Wave division multiplexing passive optical network system |
| CN101465515A (en) * | 2008-12-26 | 2009-06-24 | 中兴通讯股份有限公司 | Debugging apparatus and method based on chirp management laser |
| CN102104814A (en) * | 2011-03-14 | 2011-06-22 | 青岛海信宽带多媒体技术有限公司 | Passive optical network |
| CN202738051U (en) * | 2012-07-12 | 2013-02-13 | 青岛海信宽带多媒体技术有限公司 | Passive optical network and optical network unit optical module thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101087179A (en) * | 2006-06-09 | 2007-12-12 | 缪健 | Wave division multiplexing passive optical network |
| WO2008021567A2 (en) * | 2006-08-18 | 2008-02-21 | Finisar Corporation | Optical transmission using semiconductor optical amplifier (soa) |
| JP4913876B2 (en) * | 2010-02-01 | 2012-04-11 | 日本電信電話株式会社 | Bandwidth allocation apparatus and bandwidth allocation method |
-
2012
- 2012-07-12 CN CN201210242055.4A patent/CN102752676B/en active Active
- 2012-09-18 WO PCT/CN2012/081544 patent/WO2014008712A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200983592Y (en) * | 2006-08-16 | 2007-11-28 | 上海未来宽带技术及应用工程研究中心有限公司 | Wave division multiplexing passive optical network system |
| CN101465515A (en) * | 2008-12-26 | 2009-06-24 | 中兴通讯股份有限公司 | Debugging apparatus and method based on chirp management laser |
| CN102104814A (en) * | 2011-03-14 | 2011-06-22 | 青岛海信宽带多媒体技术有限公司 | Passive optical network |
| CN202738051U (en) * | 2012-07-12 | 2013-02-13 | 青岛海信宽带多媒体技术有限公司 | Passive optical network and optical network unit optical module thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102752676A (en) | 2012-10-24 |
| WO2014008712A1 (en) | 2014-01-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102752055B (en) | EPON and optical module for optical network unit thereof | |
| CN101039149B (en) | Wavelength aligning method and system | |
| CN102523540B (en) | Optical module and passive optical network with same | |
| CN103516434B (en) | Optical sender | |
| US20150125153A1 (en) | Method for measuring wavelength channel tuning time of tunable device in optical network, and system thereof | |
| CN105324703A (en) | Burst optical signal transmission device and control method for burst optical signal transmission device | |
| CN104539370A (en) | Laser and optical module | |
| CN100440756C (en) | Passive optical network and its data communication method | |
| CN101888269A (en) | Method for stabilizing wavelength of optical transmitter in WDM-TDMA (Wavelength Division Multiplex-Time Division Multiple Address) mixed PON (Passive Optical Network) system in burst mode | |
| US20160248520A1 (en) | Optical transmitter, subscriber side device, and light source temperature change suppression method | |
| CN102752676B (en) | EPON and optical module for optical network unit thereof | |
| CN104253655B (en) | Transmitter and optical network unit for TWDM PON Wavelength tunable | |
| CN201413415Y (en) | DWDM SFD with controllable wavelength | |
| CN102752054A (en) | Optical module of optical network unit | |
| CN102932697B (en) | EPON and Low-power-consumptiocontrol control method thereof and optical network unit | |
| CN202738051U (en) | Passive optical network and optical network unit optical module thereof | |
| CN101630976A (en) | Colorless optical transceiver and optical communication system | |
| CN203522750U (en) | Optical network unit optical module | |
| Straub et al. | Field trial of a system-independent infrastructure monitoring system for access networks | |
| KR20130018465A (en) | Apparatus and method of wavelength determination using tunable laser and optical communication system for the same | |
| CN203387514U (en) | Optical network unit optical module capable of adjusting emission wavelength | |
| CN102780529B (en) | EPON and optical line terminal optical module thereof | |
| CN202906916U (en) | Optical network unit optical module | |
| CN203554454U (en) | Passive optical network, optical link terminal (OLT) and optical module thereof | |
| EP2884761B1 (en) | Method of monitoring a connectivity of an optical access terminal in an optical access network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |