CN102202245B - Method, device and system for processing signals - Google Patents
Method, device and system for processing signals Download PDFInfo
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- CN102202245B CN102202245B CN 201010135821 CN201010135821A CN102202245B CN 102202245 B CN102202245 B CN 102202245B CN 201010135821 CN201010135821 CN 201010135821 CN 201010135821 A CN201010135821 A CN 201010135821A CN 102202245 B CN102202245 B CN 102202245B
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Abstract
The embodiment of the invention relates to a method, device and system for processing signals. The method comprises the following steps: precoding an original level signal to form a first level signal and a second level signal in halved speeds, wherein, a clock phase of the first level signal and the clock phase of the second level signal differ 180 degrees; driving a laser by utilizing the firstlevel signal and the second level signal at the same time; and leading the laser to generate and send a doubinary system signal. By adopting the embodiment of the invention, the doubinary system signal is output by the laser, so as to lead the information carrying speed to be improved by one time, thus improving the data transmission speed in a passive optical network (PON) network based on the existing laser device.
Description
Technical field
The embodiment of the invention relates to communication technical field, relates in particular to a kind of signal processing method, Apparatus and system.
Background technology
EPON (Passive Optical Network, be called for short: PON) technology is a kind of Optical Fiber Transmission and access technology of point-to-multipoint, optical line terminal (Optical Line Terminal by office's side, be called for short: OLT), optical network unit (the Optical Network Unit of user's side, be called for short: ONU) or Optical Network Terminal (Optical Network Terminal, be called for short: ONT) and Optical Distribution Network (OpticalDistribution Network is called for short: ODN) form.Because the ODN of PON system is made up of optical branching device passive devices such as (Splitter), do not contain any active electronic device and electronic power supply, so the cost of management maintenance is lower.
In the PON system, OLT is down direction to the data transfer direction of ONU, adopt time division multiplexing (Time Division Multiplex, be called for short: TDM) mode, be that OLT sends to the ONU of user's side with downlink data in the mode of broadcasting continuously, each ONU selects one's own data to receive; ONU is up direction to the transfer of data of OLT; adopt time division multiple access to insert (Time DivisionMultiple Access; be called for short: TDMA) mode; be that a plurality of ONU send to OLT by the shared up link of time-multiplexed mode with upstream data, the guard time interval that avoids conflict is arranged between each ascending time slot.
Along with the user is increasing to the demand of data, need upgrade to promote message transmission rate to PON, for example: with gigabit PON (Gigabit-Capable PON, be called for short: GPON) be upgraded to PON of future generation (Next Generation PON, be called for short: NGPON), in NGPON, further improve data rate if desired, need to adopt laser device more at a high speed to replace existing 2.5G laser device.But along with the upgrading hardware cost of PON network also along with significantly increasing, be unfavorable for developing rapidly of PON network.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of signal processing method, Apparatus and system, is implemented in the message transmission rate that improves on the basis that has device now in the PON network.
The embodiment of the invention provides a kind of signal processing method, comprising:
The original level signal is carried out precoding form first level signal and second level signal that speed reduces by half, the clock phase of the clock phase of described first level signal and described second level signal differs 180 degree;
Utilize described first level signal and described second level signal drive laser simultaneously, so that described laser generates and sends duobinary optical signal.
The embodiment of the invention provides a kind of signal processing apparatus, comprising:
Precoding module is used for that the original level signal is carried out precoding and forms first level signal and second level signal that speed reduces by half, and the clock phase of the clock phase of described first level signal and described second level signal differs 180 degree;
The light signal generation module is used for utilizing described first level signal and described second level signal drive laser simultaneously, so that described laser generates and sends duobinary optical signal.
The embodiment of the invention provides a kind of signal processing method, comprising:
Convert the duobinary optical signal that receives to the signal of telecommunication;
The described signal of telecommunication and two reference levels are compared back generation first binary sequence and second binary sequence respectively;
With described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu.
The embodiment of the invention provides a kind of signal processing apparatus, comprising:
Photoelectric conversion module is used for converting the duobinary optical signal that receives to the signal of telecommunication;
Comparison module is used for the described signal of telecommunication and two reference levels are compared back generation first binary sequence and second binary sequence respectively;
Decoding module is used for described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu.
The embodiment of the invention provides a kind of signal processing system, comprising: first signal processing apparatus, secondary signal processing unit;
Described first signal processing apparatus, be used for that the original level signal is carried out precoding and form first level signal and second level signal that speed reduces by half, utilize described first level signal and described second level signal drive laser simultaneously, so that described laser generates duobinary optical signal and described duobinary optical signal is sent to the secondary signal processing unit, the clock phase of the clock phase of wherein said first level signal and described second level signal differs 180 degree;
Described secondary signal processing unit, be used for and convert the signal of telecommunication to from the duobinary optical signal that described first signal processing apparatus receives, the described signal of telecommunication and level deviation amount are compared the back generate first binary sequence and second binary sequence, with described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu.
The signal processing method that the embodiment of the invention provides, Apparatus and system, form first level signal and second level signal that speed reduces by half by the original level signal being carried out precoding, because the clock phase of first level signal and the clock phase of second level signal differ 180 degree, by with this first level signal and the second level signal drive laser, make laser generate and the output duobinary optical signal, therefore and described duobinary optical signal can make the information rate of carrying be doubled, and has realized having improved on the basis of existing laser device the message transmission rate in the PON network.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of signal processing method of the present invention passive optical network applicatory;
Fig. 2 is the schematic flow sheet of an embodiment of signal processing method of the present invention;
Fig. 3 is the schematic flow sheet of another embodiment of signal processing method of the present invention;
Fig. 4 is the structural representation of an embodiment of signal processing apparatus of the present invention;
Fig. 5 is the structural representation of another embodiment of signal processing apparatus of the present invention;
Fig. 6 is the electrical block diagram that is suitable for embodiment illustrated in fig. 5;
Fig. 7 is sequential schematic diagram embodiment illustrated in fig. 6;
Fig. 8 is the schematic diagram of middle laser output eye pattern embodiment illustrated in fig. 6;
Fig. 9 is the schematic flow sheet of another embodiment of signal processing method of the present invention;
Figure 10 is the schematic flow sheet of another embodiment of signal processing method of the present invention;
Figure 11 is the structural representation of another embodiment of signal processing apparatus of the present invention;
Figure 12 is the structural representation of another embodiment of signal processing apparatus of the present invention;
Figure 13 is the electrical block diagram that is suitable for embodiment illustrated in fig. 12;
Figure 14 is a structural representation of middle threshold value reconstruction circuit embodiment illustrated in fig. 13;
Figure 15 is another structural representation of middle threshold value reconstruction circuit embodiment illustrated in fig. 13;
Figure 16 is the structural representation of signal processing system embodiment of the present invention;
Figure 17 is the timing waveform schematic diagram of the input signal of embodiment of the invention limiting amplifier;
Figure 18 is the spectrum diagram of timing waveform shown in Figure 17;
Figure 19 is the timing waveform schematic diagram of the output signal of embodiment of the invention limiting amplifier;
Figure 20 is the spectrum diagram of timing waveform shown in Figure 19;
Figure 21 is the schematic diagram of a transfer function of the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
In order more to be expressly understood the embodiment of the invention, below device and the circuit that may adopt in the embodiment of the invention carried out functional introduction.
Laser described in the embodiment of the invention (LD) can be directly modulated lasers, is luminous device; Output optical power is changed and changes along with the electric current that flows through it, and when modulation signal was 1 bit, the electric current that flows through it increased, and it is big that Output optical power becomes, and when modulation signal was 0 bit, the electric current that flows through it reduced, thereby Output optical power reduces; To be output data rate change along with the clock size in the d type flip flop effect, in rising edge of clock signal status input signal passed to output, and namely to change be rising edge at clock to state, and output state is followed the conversion of input state; Laser driver (LDD) is the device that input signal is converted to the signal that is fit to drive laser; Triode (T1, T2) is used for the electricity isolation mutually with LDD, avoids LDD interference each other; XOR gate is two paths of signals to be carried out XOR handle, that is: two incoming levels are identical is output as lowly, and two incoming level differences then are output as height; The different light signal that photoelectric detector (PD) is used for importing converts the different signals of telecommunication to; Trans-impedance amplifier (TIA) is to convert the current signal that photoelectric detector (PD) is exported to voltage signal; Limiting amplifier is voltage signal amplifier to the fixing level with TIA output.When input signal is in "+" leads ends, reference level is in "-" leads ends, if input signal is higher than reference level, then limiting amplifier is output as height, be output as on the contrary low, when input signal is in "-" leads ends, reference level is in "+" leads ends, if input signal is higher than reference level, then limiting amplifier is output as lowly, is output as height on the contrary; Be the two-way input signal to be carried out logic multiply each other with door, namely have only two-way input signal signal for high, output just is height, and other states are output as low; (Burst modeClock and Data Recovery is called for short: BCDR) be to recover clock and data from the input bursty data burst clock and data recovery; Threshold value reconstruction circuit (decision abstract) is two reference levels that obtain limiting amplifier from the uplink burst signal.
Below with reference to various specific implementations, introduce signal processing method, Apparatus and system that the embodiment of the invention provides in detail.
Fig. 1 is the structural representation of signal processing method of the present invention passive optical network applicatory, and the technical scheme that the embodiment of the invention provides can be applied in the passive optical network PON system shown in Figure 1.This PON system can comprise the optical line terminal (OLT) 1 that is positioned at the central office and a plurality of optical network units (ONU) 2 that are positioned at user's side.Wherein, OLT1 is connected by Optical Distribution Network (ODN) 3 and in the mode of point to multiple spot with ONU2.At down direction, OLT1 is broadcast to ONU2 with downlink data, makes ONU2 can select one's own data to receive; And at up direction, a plurality of ONU2 adopt time division multiple access TDMA mode to share optical transmission chain according to the OLT1 distributed time slot, realize upstream data is sent to OLT1.
Fig. 2 is the schematic flow sheet of an embodiment of signal processing method of the present invention, and as shown in Figure 2, the signal processing method of present embodiment can be applied among the ONU, and it can make described ONU that upstream data is modulated into duobinary optical signal, to improve data rate.Particularly, described signal processing method can comprise the steps:
The signal processing method that the embodiment of the invention provides, form first level signal and second level signal that speed reduces by half by the original level signal being carried out precoding, because the clock phase of first level signal and the clock phase of second level signal differ 180 degree, by with this first level signal and the second level signal drive laser, so that described laser is exported duobinary light signal, therefore thereby make its information rate of carrying be doubled, realized having improved on the basis of existing laser device the message transmission rate in the PON network.
Fig. 3 is the schematic flow sheet of another embodiment of signal processing method of the present invention, and as shown in Figure 3, present embodiment comprises the steps:
Wherein, step 202 there is no temporal sequencing with step 203, as long as can obtain first level signal and second level signal by d type flip flop, in specific embodiment, described step 202 and step 203 also can be carried out simultaneously.
Control connection is at first triode of the negative electrode of laser and the state of second triode respectively for step 204, described first level signal of employing and second level signal, and wherein said first triode and second triode are used for realizing the mutual electricity isolation of first level signal and second level signal;
The signal processing method that the embodiment of the invention provides, form first level signal and second level signal that speed reduces by half by the original level signal being carried out precoding, because the clock phase of first level signal and the clock phase of second level signal differ 180 degree, by the negative electrode with this first level signal and the second level signal drive laser, the information rate that makes laser output duobinary optical signal carry is doubled, and has therefore realized having improved on the basis of existing laser device the message transmission rate in the PON network.
Based on above signal processing method, the embodiment of the invention also further provides a kind of signal processing apparatus.
Fig. 4 is the structural representation of an embodiment of signal processing apparatus of the present invention, and the signal processing apparatus in the present embodiment is specifically as follows ONU, and as shown in Figure 4, present embodiment comprises: precoding module 31, light signal generation module 32;
Wherein, precoding module 31 is carried out precoding with the original level signal and is formed first level signal and second level signal that speed reduces by half, and the clock phase of the clock phase of described first level signal and described second level signal differs 180 degree; Light signal generation module 32 is with described first level signal and described second level signal while drive laser, so that described laser generates duobinary light signal.
The signal processing apparatus that the embodiment of the invention provides, by precoding module 31 the original level signal is carried out precoding and form first level signal and second level signal that speed reduces by half, because the clock phase of first level signal and the clock phase of second level signal differ 180 degree, light signal generation module 32 is further with this first level signal and the second level signal drive laser, can be so that laser be exported duobinary light signal, therefore thereby the information rate that the light signal that makes output carries is doubled, and has realized having improved on the basis of existing laser device the message transmission rate in the PON network.
Fig. 5 is the structural representation of another embodiment of signal processing apparatus of the present invention, and the signal processing apparatus in the present embodiment is specifically as follows ONU, and as shown in Figure 5, present embodiment comprises: precoding module 41, light signal generation module 42;
Wherein, precoding module 41 can comprise: precoding unit 411, first processing unit 412, second processing unit 413; Wherein, precoding unit 411 can comprise an XOR gate, and it can adopt described XOR gate with the previous output of original level signal and described XOR gate phase XOR as a result, obtains the level signal after the precoding; The level signal of first processing unit 412 after with described precoding sent into first d type flip flop, exports first level signal, and the clock frequency of described first d type flip flop is half of data rate of described original level signal; The level signal of second processing unit 413 after with described precoding sent into second d type flip flop, export second level signal, the clock frequency of described second d type flip flop is half of data rate of described original level signal, and the phase phasic difference 180 between the clock that adopts of the clock that adopts of described second d type flip flop and described first d type flip flop is spent.
Further, light signal generation module 42 can comprise: electric isolation drive unit 421, power drives unit 422, light signal generation unit 423; Wherein, electric isolation drive unit 421 drives the negative electrode of described laser respectively with described first level signal and described second level signal by first triode and second triode, and the mutual electricity of described first level signal and described second level signal is isolated; Power drives unit 422 is by the anode of the described laser of power drives; Light signal generation unit 423 is by the output of described laser and described first level signal and the corresponding light signal of the corresponding current signal of the second level signal sum.
The signal processing apparatus that the embodiment of the invention provides, by precoding module 41 the original level signal is carried out precoding and form first level signal and second level signal that speed reduces by half, because the clock phase of first level signal and the clock phase of second level signal differ 180 degree, formed duobinary level signal, light signal generation module 42 is with the negative electrode of this first level signal and the second level signal drive laser, make laser export duobinary light signal and its information rate of carrying is doubled, therefore realized having improved on the basis of existing laser device the message transmission rate in the PON network.
Fig. 6 is the electrical block diagram that is suitable for embodiment illustrated in fig. 5, as shown in Figure 6, with original level signal (also namely need launch data) B[i] as the input of XOR (XOR) door 51, the output M[i of XOR gate 51] be divided into three the tunnel, one the tunnel gives d type flip flop 52, the frequency of the clock signal of d type flip flop 52 (Clock) is identical with the frequency of original level signal, at this moment, the output M[i of XOR gate 51]=B[i] XOR M[i-1], with M[i] frequency by clock signal is M[i] speed half, two clock signals of phase phasic difference 180 degree are given first d type flip flop 53 respectively, second d type flip flop 54, then the data rate of first d type flip flop 53 and second d type flip flop 54 is the output M[i of XOR gate 51] half, also namely first level signal exported respectively of first d type flip flop 53 and second d type flip flop 54 and the data rate of second level signal are M[i] half, first driver 55 is by the first triode T1, second driver 56 generates the light signal C[i corresponding with the original level signal by the common drive laser 57 of the second triode T2 thereby pass through laser 57].Because the data rate of first level signal and second level signal is half of data rate of original level signal, has realized that therefore laser driver (LDD) and the laser of employing low rate comes high-speed digital signal is modulated, transmitted.First driver 55 and second driver 56 are specially laser driver (LDD), by the output of two laser drivers is luminous through amplifying the rear drive laser through the isolation of high speed triode respectively, generate the light signal corresponding with the original level signal, avoided first level signal and the interference each other of second level signal.
Fig. 7 is sequential schematic diagram embodiment illustrated in fig. 6, and Fig. 8 is the schematic diagram of middle laser output eye pattern embodiment illustrated in fig. 6; As shown in Figure 6, first level signal, second level signal is at 0 o'clock, the Output optical power of laser is 0 unit, one in first level signal and second level signal is 1, another is 0 o'clock, then the Output optical power of laser is 1 unit, when first level signal and second level signal are 1, laser output power is 2 units, thereby realized the C[i of cataloged procedure]=M[i]+M[i-1], laser output eye pattern as shown in Figure 7, as shown in Figure 7, laser output has three kinds of states: 0,1,2, and three kinds of states (0,1,2) with two states (0,1) compares, reduced the modulation bandwidth of laser, therefore can adopt the laser of low speed to modulate, reduce the cost of laser.In addition, owing to be the ONU side, need turn-off the unlatching of laser and do quick switching.
Fig. 9 is the schematic flow sheet of another embodiment of signal processing method of the present invention, as shown in Figure 9, the signal processing method of present embodiment can be applied among the OLT, and it can make described OLT receive the duobinary optical signal of ONU transmission and it is deciphered, thereby recover original data-signal.Particularly, described signal processing method can comprise the steps:
The signal processing method that the embodiment of the invention provides, by the signal of telecommunication and two reference levels are compared back generation first binary sequence and second binary sequence respectively, with first binary sequence and second binary sequence by recovering the original level signal with Men Xiangyu, finish the recovery of raw data rate, therefore improved the message transmission rate in the PON network on the basis of existing laser device.
Figure 10 is the schematic flow sheet of another embodiment of signal processing method of the present invention, and as shown in figure 10, the embodiment of the invention comprises the steps:
The signal processing method that the embodiment of the invention provides, by being compared the back with first reference level and second reference level respectively, the signal of telecommunication generates first binary sequence and second binary sequence, realized the conversion from three level to binary signal, finish the recovery of data rate, therefore improved the message transmission rate in the PON network on the basis of existing laser device.
On above-mentioned basis embodiment illustrated in fig. 10, also comprise: voltage signal passing threshold reconstruction circuit is obtained first reference level and second reference level, wherein, first reference level is connected with the positive pole (+) of first limiting amplifier, and second reference level is connected with the negative pole (-) of second limiting amplifier.
Based on above signal processing method, the embodiment of the invention also further provides a kind of signal processing apparatus.
Figure 11 is the structural representation of another embodiment of signal processing apparatus of the present invention, and as shown in figure 11, the signal processing apparatus in the present embodiment is specifically as follows OLT, and present embodiment comprises: photoelectric conversion module 11, comparison module 12, decoding module 13;
Wherein, photoelectric conversion module 11 converts the duobinary optical signal that receives to the signal of telecommunication; Comparison module 12 compares back generation first binary sequence and second binary sequence respectively with the described signal of telecommunication and two reference levels; Decoding module 13 with described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu.
The signal processing apparatus that the embodiment of the invention provides, by comparison module 12 signal of telecommunication and two reference levels are compared back generation first binary sequence and second binary sequence respectively, decoding module 13 with first binary sequence and second binary sequence by recovering the original level signal with Men Xiangyu, finish the recovery of data rate, therefore improved the message transmission rate in the PON network on the basis of existing laser device.
Figure 12 is the structural representation of another embodiment of signal processing apparatus of the present invention, and as shown in figure 12, present embodiment comprises: photoelectric conversion module 21, comparison module 22, decoding module 23, acquisition module 24;
Wherein, photoelectric conversion module 21 converts the duobinary optical signal that receives to the signal of telecommunication; Comparison module 22 compares back generation first binary sequence and second binary sequence respectively with the described signal of telecommunication and two reference levels; Decoding module 23 with described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu; Acquisition module 24 obtains first reference level and second reference level with described voltage signal passing threshold reconstruction circuit, described first reference level is connected with the positive pole of described first limiting amplifier, and described second reference level is connected with the negative pole of described second limiting amplifier.
Further, photoelectric conversion module 21 can also comprise: first converting unit 211, second converting unit 212; Wherein, first converting unit 211 converts the light signal that receives to current signal by optical signal detector; Second converting unit 212 converts described current signal to voltage signal through trans-impedance amplifier.
Further, comparison module 22 can also comprise: first comparing unit 221, second comparing unit 222, processing unit 223; Wherein, first comparing unit 221 compares negative pole and described first reference level of described voltage signal by first limiting amplifier, obtains first binary sequence; Second comparing unit 222 compares positive pole and described second reference level of described voltage signal by second limiting amplifier, obtains second binary sequence; Processing unit 223 recovers the original level signal with described first binary sequence and described second binary sequence after handling with door.
The signal processing apparatus that the embodiment of the invention provides, by being compared the back with first reference level and second reference level respectively, the signal of telecommunication generates first binary sequence and second binary sequence, realized the conversion from three level to binary signal, finish the recovery of data rate, therefore improved the message transmission rate in the PON network on the basis of existing laser device.
Figure 13 is the electrical block diagram that is suitable for embodiment illustrated in fig. 12, as shown in figure 13, optical signal detector 31 converts the duobinary optical signal that receives to current signal, convert this current signal to voltage signal through behind the trans-impedance amplifier 32, this voltage signal is given the negative pole (-) of first limiting amplifier 33 respectively, the positive pole (+) of second limiting amplifier 34, because the positive pole (+) of first limiting amplifier 33 connects by first reference level of threshold value reconstruction circuit 36 according to the voltage signal generation of trans-impedance amplifier 32 outputs, the negative pole (-) of second limiting amplifier 34 connects by second reference level of threshold value reconstruction circuit 36 according to the voltage signal generation of trans-impedance amplifier 32 outputs, when the output signal of trans-impedance amplifier 32 is 0, the output C=1 of first limiting amplifier 33, the output D=0 of second limiting amplifier 34 is with C and D process and door 35 and back output E=0; When the output signal of trans-impedance amplifier 32 is 1, the output C=1 of first limiting amplifier 33, the output D=1 of second limiting amplifier 34, with C and D process and door 35 and back output E=1, when trans-impedance amplifier 32 is output as 2, the output C=0 of first limiting amplifier 33, the output D=1 of second limiting amplifier 34, with C and D process and door 35 and back output E=0, namely have only when the input signal of trans-impedance amplifier 32 is 1, be output as 1 with door 35, the input signal of trans-impedance amplifier 32 is 0 and was 0 with door 35 output at 2 o'clock, thereby realized the conversion from three level to two level, will send into clock data recovery circuit 37 with the output of door 35, clock data recovery circuit 37 has recovered original data rate under the situation that speed doubles.
Figure 14 is a structural representation of middle threshold value reconstruction circuit embodiment illustrated in fig. 13, as shown in figure 14, the output of trans-impedance amplifier gives threshold value reconstruction circuit (decision abstract) 40 input signals as threshold value reconstruction circuit 40, threshold value reconstruction circuit 40 comprises: peak detection circuit (TD) 41, mean value detecting circuit (AD) 42, first amplifier 43 (A1), second amplifier (A2) 44, the 3rd amplifier (A3) 45; Wherein, peak detection circuit (TD) 41 sizes for detection of the input signal top level, mean value detecting circuit (AD) 42 is for detection of the mean value of input signal.
The input signal of peak detection circuit 41 detection threshold reconstruction circuit 40 obtains the top level V of this input signal
p, the mean value of the input signal of mean value detecting circuit 42 detection threshold reconstruction circuit 40 obtains the mean value V of this input signal
a, with the top level V of peak detection circuit 41
pMean value V with mean value detecting circuit 42
aGive first amplifier (A1) 43, then first amplifier 43 is output as 1/2nd of both differences, i.e. 0.5 * (V
p-V
a), with the output 0.5 * (V of this first amplifier (A1) 43
p-V
a) and the output V of mean value detecting circuit 42
aGive second amplifier (A2) 44, obtain first reference voltage+V
Offset=V
a+ 0.5 * (V
p-V
a), with the output of first amplifier (A1) 43
Output V with mean value detecting circuit
aGive the 3rd amplifier (A3) 45 together, obtain-V
Offset=V
a-0.5 * (V
p-V
a); In addition, when time slot finishes, (Media Access Control is called for short: MAC) send the control signal that resets for control peak detection circuit 41, for first reference level and second reference level that obtain next time slot are got ready from medium access control.
Figure 15 be embodiment illustrated in fig. 13 in another structural representation of threshold value reconstruction circuit, the threshold value reconstruction circuit in embodiment illustrated in fig. 13 also can adopt the top to detect and the method for floor detection the input signal of threshold value reconstruction circuit 50; Particularly, the top level V of peak detection circuit 51
p, the valley level V of valley value detection circuit 52
b, with top level V
pWith valley level V
bGive the input of first amplifier (A1) 53, then first amplifier 53 is output as top level V
pWith valley level V
bDifference 1/4th, i.e. 0.25 * (V
p-V
b), with the output 0.25 * (V of first amplifier (A1) 53
p-V
b) and valley level V
bGive second amplifier (A2) 54 and obtain first reference level+V
Offset=V
b+ 0.75 * (V
p-V
b), with the output+V of first amplifier (A1) 53
Offset=V
b+ 0.75 * (V
p-V
b) and valley level V
bGive the 3rd amplifier (A3) 55 and obtain second reference level-V
Offset=V
b+ 0.25 * (V
p-V
b); In addition, the reset signal that MAC sends here resets simultaneously to peak detection circuit 51 and valley value detection circuit 52, for first reference level and second reference level that obtain next time slot are got ready.
Further, the embodiment of the invention also provides a kind of signal processing system, and described signal processing system can be the PON system.Figure 16 is the structural representation of signal processing system embodiment of the present invention, and as shown in figure 16, present embodiment comprises: first signal processing apparatus 61, secondary signal processing unit 62; Wherein, described first signal processing apparatus 61 can be the transmitter of ONU, and described secondary signal processing unit can be the receiving equipment of OLT.For ease of understanding, Figure 16 only is one first signal processing apparatus that schematically draws, be to be understood that, implement in the PON system concrete, described first signal processing apparatus can be for a plurality of, and described a plurality of first signal processing apparatus can be connected to described secondary signal processing unit by fiber optic network.
Wherein, first signal processing apparatus 61, be used for that the original level signal is carried out precoding and form first level signal and second level signal that speed reduces by half, with described first level signal and described second level signal while drive laser, so that described laser generates duobinary optical signal, and described duobinary optical signal sent to secondary signal processing unit 62, wherein, the clock phase of the clock phase of described first level signal and described second level signal differs 180 degree;
Secondary signal processing unit 62 will convert the signal of telecommunication to from the duobinary optical signal that first signal processing apparatus 61 receives, the described signal of telecommunication and level deviation amount are compared the back generate first binary sequence and second binary sequence, with described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu.
The signal processing system that the embodiment of the invention provides, by first signal processing apparatus 61 the original level signal is carried out precoding and form first level signal and second level signal that speed reduces by half, form duobinary level signal, because the clock phase of first level signal and the clock phase of second level signal differ 180 degree, formed duobinary level signal, by with this first level signal and the second level signal drive laser, make laser generate and information rate that the duobinary optical signal of output is carried is doubled, therefore realized having improved on the basis of existing laser device the message transmission rate in the PON network; By secondary signal processing unit 62 signal of telecommunication and two reference levels are compared back generation first binary sequence and second binary sequence respectively, with first binary sequence and second binary sequence by recovering the original level signal with Men Xiangyu, realize the conversion from three level to binary signal, finished the recovery of data rate.
An application as the embodiment of the invention, described first signal processing apparatus 61 can adopt Fig. 4 and the transmitter as ONU embodiment illustrated in fig. 5, and described first signal processing apparatus 61 can adopt Figure 11 and the described embodiment of Figure 12 as the receiving equipment of OLT.
Recover initial data for how the clearer explanation embodiment of the invention realizes the light signal that will receive, carry out exemplary illustration below in conjunction with the simulation result of the embodiment of the invention; Figure 17 is the timing waveform schematic diagram of the input signal of embodiment of the invention limiting amplifier, and Figure 18 is the spectrum diagram of timing waveform shown in Figure 17; Figure 19 is the timing waveform schematic diagram of the output signal of embodiment of the invention limiting amplifier, and Figure 20 is the spectrum diagram of timing waveform shown in Figure 19; As shown in figure 17, the input signal of limiting amplifier has three kinds of states: 0,1,2; As shown in figure 18, the corresponding spectral bandwidth of these three kinds of states is 2.5GHz (hertz); Through behind the limiting amplifier, as shown in figure 19, the output signal of limiting amplifier has two states: 0,1; As Figure 20, the spectral bandwidth of this two states correspondence is 5GHz (hertz), makes the embodiment of the invention can adopt the laser driver (LDD) of low rate and laser to come high-speed digital signal is modulated, transmitted; And will finish the recovery of data rate at receiving terminal.
Figure 21 is the schematic diagram of a transfer function of the embodiment of the invention, as shown in figure 21, two limiting amplifiers that the embodiment of the invention adopts (first limiting amplifier, second limiting amplifier), double threshold (first reference level, second reference level), the corresponding transfer function of three level inputs (0,1,2) are equivalent to a rectifier and square-law detection circuit, and through after the limiting amplifier, the spectral bandwidth of output signal has returned to 5GHz (hertz).
Further, the invention described above embodiment, the high speed signal that will launch is divided into the signal (that is: first level signal and second level signal) that two-way speed reduces by half through after the precoding, this two paths of signals is removed to drive the same laser of modulation simultaneously, therefore make the bandwidth of the light signal launched from laser reduce by half; The embodiment of the invention by laser and the driver that utilizes low speed, has been finished modulation, the transmission of high speed signal; The photoelectricity testing part that can adopt low speed at receiving terminal (for example: avalanche photodide (Avalanche Photodetector, be called for short: APD) or the PIN pipe) convert light signal to the signal of telecommunication, to be converted to by the current signal that photoelectricity testing part produces through trans-impedance amplifier (TIA) and to give first limiting amplifier behind the voltage signal and second limiting amplifier carries out the amplitude limit amplification, two reference levels carry out amplitude limit and amplify, finished the recovery of data rate, made that the bandwidth after the amplitude limit amplification is the preceding twice of amplitude limit.In addition, because the mpsi layer cost is mainly by the optical device price decision, and the optical device cost in the optical communication equipment is very sensitive to message transmission rate, the laser device price of existing 10G is about 30 times of laser device price of 1G, and the electrical chip price is to message transmission rate and insensitive, therefore by adopting the technical scheme of the embodiment of the invention, on based on the basis of doubinary encoding, message transmission rate is promoted one times, but the cost of optical device remains unchanged.
The those skilled in the art can be well understood to, and is the convenience described and succinct, and the concrete course of work of the system of foregoing description, equipment, module and unit can not repeat them here with reference to the corresponding process among the preceding method embodiment.
One of ordinary skill in the art will appreciate that: all or part of step that realizes above-described embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a signal processing method is characterized in that, comprising:
The original level signal is carried out precoding, form first level signal and second level signal that speed reduces by half, the clock phase of the clock phase of described first level signal and described second level signal differs 180 degree;
Utilize described first level signal and described second level signal drive laser simultaneously, so that described laser generates and sends duobinary optical signal;
Wherein, describedly the original level signal is carried out precoding form first level signal and second level signal that speed reduces by half and comprise:
Adopt XOR gate with the previous output of original level signal and described XOR gate phase XOR as a result, obtain the level signal after the precoding;
Level signal after the described precoding is sent into first d type flip flop, export first level signal, the clock frequency of described first d type flip flop is half of data rate of described original level signal;
Level signal after the described precoding is sent into second d type flip flop, export second level signal, the clock frequency of described second d type flip flop is half of data rate of described original level signal, and the phase phasic difference 180 between the clock that the clock that described second d type flip flop adopts and described first d type flip flop adopt is spent.
2. method according to claim 1 is characterized in that, utilizes described first level signal and described second level signal while drive laser to comprise:
Adopt described first level signal and second level signal difference control connection at first triode of the negative electrode of laser and the state of second triode, driving the negative electrode of described laser, and described first triode and second triode be used for making described first level signal and second level signal mutually electricity isolate.
3. method according to claim 2 is characterized in that, described generation duobinary optical signal comprises:
Anode by the described laser of power drives;
The drive current of controlling described laser by described first triode and second triode is corresponding with described first level signal and the second level signal sum, and makes described laser generate duobinary light signal according to described drive current.
4. a signal processing apparatus is characterized in that, comprising:
Precoding module is used for that the original level signal is carried out precoding and forms first level signal and second level signal that speed reduces by half, and the clock phase of the clock phase of described first level signal and described second level signal differs 180 degree;
The light signal generation module is used for utilizing described first level signal and described second level signal drive laser simultaneously, so that described laser generates duobinary optical signal;
Wherein, described precoding module comprises:
Precoding unit be used for to adopt XOR gate with the previous output of original level signal and described XOR gate phase XOR as a result, obtains the level signal after the precoding;
First processing unit is used for the level signal after the described precoding is sent into first d type flip flop, exports first level signal, and the clock frequency of described first d type flip flop is half of data rate of described original level signal;
Second processing unit, be used for the level signal after the described precoding is sent into second d type flip flop, export second level signal, the clock frequency of described second d type flip flop is half of data rate of described original level signal, and the phase phasic difference 180 between the clock that the clock that wherein said second d type flip flop adopts and described first d type flip flop adopt is spent.
5. device according to claim 4 is characterized in that, described light signal generation module comprises:
Electricity isolation drive unit, be used for will described first level signal driving the negative electrode of described laser respectively simultaneously by first triode and second triode with described second level signal, make the mutual electric isolation of described first level signal and described second level signal;
The power drives unit is used for the anode by the described laser of power drives;
The light signal generation unit is used for exporting the light signal corresponding with described first level signal and the corresponding current signal of the second level signal sum by described laser.
6. a signal processing system is characterized in that, comprising: first signal processing apparatus, secondary signal processing unit;
Described first signal processing apparatus, be used for that the original level signal is carried out precoding and form first level signal and second level signal that speed reduces by half, utilize described first level signal and the described second level signal drive laser, so that described laser generates duobinary optical signal, and described duobinary optical signal sent to the secondary signal processing unit, the clock phase of the clock phase of wherein said first level signal and described second level signal differs 180 degree;
Wherein, described first signal processing apparatus carries out precoding with the original level signal and forms first level signal that speed reduces by half and comprise with second level signal: adopt XOR gate with the previous output result of original level signal and described XOR gate XOR mutually, obtain the level signal after the precoding; Level signal after the described precoding is sent into first d type flip flop, export first level signal, the clock frequency of described first d type flip flop is half of data rate of described original level signal; Level signal after the described precoding is sent into second d type flip flop, export second level signal, the clock frequency of described second d type flip flop is half of data rate of described original level signal, and the phase phasic difference 180 between the clock that the clock that described second d type flip flop adopts and described first d type flip flop adopt is spent;
Described secondary signal processing unit, be used for and convert the signal of telecommunication to from the duobinary optical signal that described first signal processing apparatus receives, the described signal of telecommunication and level deviation amount are compared the back generate first binary sequence and second binary sequence, with described first binary sequence and described second binary sequence by recovering the original level signal with Men Xiangyu.
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| CN103310509B (en) * | 2012-03-15 | 2016-12-14 | 深圳光启智能光子技术有限公司 | A kind of communication means of gate control system |
| CN103840882B (en) | 2012-11-21 | 2018-09-28 | 中兴通讯股份有限公司 | The transmission of fiber optic network, reception, communication system and signal modulator approach |
| CN104243026B (en) | 2014-07-10 | 2016-05-04 | 腾讯科技（深圳）有限公司 | Method for sending information, message receiving method, device and system |
| CN107493521B (en) * | 2016-06-12 | 2022-08-02 | 中兴通讯股份有限公司 | Signal sending method and device, signal receiving method and device, and signal transmission circuit |
| WO2018218422A1 (en) * | 2017-05-27 | 2018-12-06 | 华为技术有限公司 | Method, device and system for detecting mean value of signal |
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| CN1585280A (en) * | 2003-07-30 | 2005-02-23 | 朗迅科技公司 | Duobinary-to-binary signal converter |
| US7280767B1 (en) * | 2002-11-18 | 2007-10-09 | Stratalight Communications, Inc. | Half rate precoded data RZ transmitter |
| CN101141199A (en) * | 2007-02-28 | 2008-03-12 | 中兴通讯股份有限公司 | Optical transmitting system and method |
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| US7280767B1 (en) * | 2002-11-18 | 2007-10-09 | Stratalight Communications, Inc. | Half rate precoded data RZ transmitter |
| CN1585280A (en) * | 2003-07-30 | 2005-02-23 | 朗迅科技公司 | Duobinary-to-binary signal converter |
| CN101141199A (en) * | 2007-02-28 | 2008-03-12 | 中兴通讯股份有限公司 | Optical transmitting system and method |
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