CN110224759A - A kind of optical transmitting set - Google Patents
A kind of optical transmitting set Download PDFInfo
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- CN110224759A CN110224759A CN201910591044.9A CN201910591044A CN110224759A CN 110224759 A CN110224759 A CN 110224759A CN 201910591044 A CN201910591044 A CN 201910591044A CN 110224759 A CN110224759 A CN 110224759A
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- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
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- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
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- 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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a kind of optical transmitting sets, comprising: current mode logic drive module, modulator and termination module；The input terminal of current mode logic drive module and modulator is connected using direct coupling system, current mode logic drive module is for generating and exporting high-speed-differential driving signal；The output end of modulator and the input terminal of termination module are connected using direct coupling system；Modulator is used to that its optical signal to be modulated to obtain modulated optical signal and be exported according to the high-speed-differential driving signal received；Termination module is used to the high-speed-differential driving signal received carrying out distal end impedance matching.The present invention, which has, saves hardware cost, reduces DC power, reduces the advantages of complex circuit designs degree is conducive to the Integrated design of high-density multi-channel.
Description
Technical field
The present invention relates to technical field of electro-optical communication, more particularly, to a kind of optical transmitting set.
Background technique
Requirement with data communication to bandwidth is higher and higher, and for silicon-based optical interconnection because its bandwidth is high, transmission loss is small, with
The compatibility of electrical chip becomes the effective means that substitution electricity interconnection is transmitted as short distance very fast high-bandwidth data.Optical transport chain
Road substantially may include optical transmitting set, optical receiver and optical transport medium.Wherein optical transmitting set is to convert electrical signals to optical signal,
Required device mainly includes light source, driver and electrooptic modulator.
Directly modulation and external modulation can be divided into according to modulation system difference.Mach-Zehnder modulators (Mach-
Zehnder Modulator, MZM) it is a kind of widely used external modulator, have modulation system simple, output optical signal
Line width, strong antijamming capability, the feature insensitive to temperature change.There are two longer light for Mach-Zehnder modulators tool
Phase-shifter is learned, each optical phase shifter is modulated using traveling wave electrode (transmission line electrode) driving, also referred to as traveling wave Mach-Zehnder
Device (Travelling Wave Mach-Zehnder Modulator, TW MZM).Driver is by previous stage datagram number
Enough amplitudes are amplified to, are input on the traveling wave electrode of Mach-Zehnder modulators, modulated optical signal.
Existing activation configuration is connect using AC coupled modes with the traveling wave Mach-Zehnder modulators, main
Including conventional current mode logic (Current Mode Logic, CML) driver, direct current biasing (Bias-Tee) module, traveling wave
Mach-Zehnder modulators connection and termination module；AC coupled modes can individually adjust traveling wave Mach-Zehnder modulators
Bias voltage, and make current mode logic drive module and the operating bias state of traveling wave Mach-Zehnder modulators not mutual
Mutually interfere.But because the inductance capacitance value of direct current biasing module is larger, it usually needs additional component occupies larger circuit
The area of structure design is unfavorable for the integrated circuit structure design of high-density multi-channel photoelectricity.
The design of existing optical transmitting set mainly includes open-drain (open-drain) driver, traveling wave Mach-Zehnder
Modulator and distal end load.Since the open-drain driver does not have proximal end terminating resistor, there are stronger for the design of the optical transmitting set
Optical signal reflection, influences the integrality of optical signal transmission, while having on the transmission line electrode of traveling wave Mach-Zehnder modulators
Larger DC current exists, and increases DC power, so as to cause device heating, reduces the stability of device operation and makes
The problem of with the service life.
Summary of the invention
The purpose of the present invention is to provide a kind of optical transmitting set, in the presence of solving optical transmitting set in the prior art
High DC power, high circuit complexity, and increase occupy optical transmitting set circuit area, be unfavorable for high-density multi-channel
Integrated design the problem of.
To solve the above-mentioned problems, the invention is realized by the following technical scheme:
A kind of optical transmitting set, comprising: current mode logic drive module, modulator and termination module；Using direct-coupling side
The current mode logic drive module is connect by formula with the input terminal of the modulator, and the current mode logic drive module is used for
It generates and exports high-speed-differential driving signal；Using direct coupling system by the output end of the modulator and the termination module
Input terminal connection；The modulator is used to be modulated its optical signal according to the high-speed-differential driving signal received
It obtains modulated optical signal and exports；The termination module is used to carry out the high-speed-differential driving signal received remote
Terminal impedance matching.
Further, the current mode logic drive module further comprises: load resistance, cascode structure, input
To pipe and tail current source,
The first end of the load resistance accesses the operating voltage VCC of the current mode logic drive module, second end
It is connect with the drain electrode of the cascode structure；
The source electrode of the cascode structure connect the collector of pipe with the input；
The input is grounded the emitting stage of pipe through the tail current source；
The load resistance is used to carry out the high-speed-differential driving signal proximal end impedance matching and by the input
The current signal generated to pipe is converted into high-speed-differential voltage signal；
The cascode structure is used to be isolated the input and drives to the drain output of pipe and the current mode logic
The output end of module, to reduce the influence of the Miller effect；
The input is used to pipe convert high-speed-differential driving signal for the high-speed-differential voltage signal；
The tail current source is used to be arranged the output voltage swing of the high-speed-differential driving signal.
Further, the load resistance includes the first load resistance R parallel with one anotherL1With the second load resistance RL2；
The first load resistance RL1With the second load resistance RL2First end be respectively connected to current mode logic driving
The operating voltage VCC of module；
The first load resistance RL1With the second load resistance RL2The second end leakage with the cascode structure respectively
Pole connection；
The cascode structure includes grid the first field-effect tube M interconnectedc1With the second field-effect tube Mc2；
The input includes the first bipolar junction transistor Q to pipe1With the second bipolar junction transistor Q2；Wherein, described
One bipolar junction transistor Q1Base stage input positive polarity voltage signal Vinp, the second bipolar junction transistor Q2Base stage
Input the voltage signal V of negative polarityinn。
Further, the modulator is traveling wave Mach-Zehnder modulators.
Further, the modulator includes: the first smooth phase-shifter, the second smooth phase-shifter, input light optical splitter and output
Actinic light device；
The first smooth phase-shifter includes first transmission line electrode and second transmission line electrode；
The second smooth phase-shifter includes third transmission line electrode and the 4th transmission line electrode；
One end of the second transmission line electrode and the second load resistance RL2Second end connection, the other end and institute
State the input terminal connection of termination module；
First load resistance R described in one end of the 4th transmission line electrodeL1Second end connection, the other end with it is described
The input terminal of termination module connects；
The first transmission line electrode and third transmission line electrode are connected in parallel and access bias voltage VBIAS；
The input optical splitter is for being divided into two-way branch optical signal for optical signal and exporting；
It is right respectively according to the high-speed-differential driving signal that the first smooth phase-shifter and the second smooth phase-shifter are used for
Branch's optical signal described in two-way is modulated, and the correspondence of digital information entrained by the high-speed-differential driving signal is loaded into two
In branch's optical signal described in road, to obtain the modulated branch's optical signal of two-way and export；
The output light splicer passes through all the way for synthesizing modulated branch optical signal described in the two-way received
The optical signal of modulation and output.
Further, the modulator further include: input optical interface and output optical interface；
The input optical interface is connect with the input optical splitter, for inputting the light letter to the input optical splitter
Number；
The output optical interface is connect with the output splicer, for exporting the modulated optical signal all the way.
Further, the input optical splitter is specially half optical splitter, is used for the optical signal by 1:1's
Light splitting ratio is divided into branch's optical signal described in two-way；
The output splicer is specially two-in-one splicer, is used to believe modulated branch light described in the two-way
It number is synthesized, obtains the modulated optical signal all the way.
Further, at least one PN junction is arranged at intervals between the first transmission line electrode and second transmission line electrode
Optical waveguide；
At least one PN junction optical waveguide is arranged at intervals between the third transmission line electrode and the 4th transmission line electrode.
Further, the termination module includes: the first terminating resistor R1, the second terminating resistor R2With termination capacitor CT；
The first terminating resistor R1With the second terminating resistor R2It is parallel with one another, the first terminating resistor R1First end
It is connect with the 4th transmission line electrode, second end and the termination capacitor CTFirst end connection；
The second terminating resistor R2First end connect with the second transmission line electrode, second end and the termination
Capacitor CTFirst end connection；
The termination capacitor CTSecond end access the operating voltage VCC of the termination module.
Further, the first terminating resistor R1With the second terminating resistor R2For carrying out distal end to High-speed driving signals
Differential-mode impedance matching, the first terminating resistor R1With the second terminating resistor R2Resistance value respectively with the described first smooth phase-shifter
It is consistent with the characteristic impedance of the described second smooth phase-shifter.
Further, further includes: by the bias voltage VBIASWith the operating voltage of the current mode logic drive module
VCC is shorted, the common mode DC level of the high-speed-differential driving signal by adjusting the current mode logic drive module output, with
Adjust the bias voltage of the described first smooth phase-shifter and the second smooth phase-shifter.
Further, the bias voltage of the described first smooth phase-shifter and the second smooth phase-shifter is respectively the bias voltage
VBIASWith the voltage difference of the common mode DC level of the high-speed-differential driving signal of current mode logic drive module output.
Compared with prior art, the present invention having the advantage that
A kind of optical transmitting set provided by the invention, comprising: current mode logic drive module, modulator and termination module；It adopts
The current mode logic drive module is connect with the input terminal of the modulator with direct coupling system, for exporting high speed difference
Divide driving signal；The output end of the modulator is connect with the input terminal of the termination module using direct coupling system；Institute
Modulator is stated for being modulated to obtain modulated light to its optical signal according to the high-speed-differential driving signal that receives
Signal simultaneously exports；The termination module is used to the high-speed-differential driving signal received carrying out distal end impedance matching.I.e.
One aspect of the present invention does not need setting such as direct current biasing mould by using direct coupling system (direct-coupled driving method)
Additional component required for block or DC voltage excluder etc., has saved hardware cost required for optical transmitting set, with
And reduce the area of optical transmitting set circuit.
On the other hand, the bias voltage VBIASHigh-speed-differential driving signal is exported with the current mode logic drive module
Common mode DC level voltage difference be the described first, second smooth phase-shifter bias voltage.By adjusting bias voltage VBIAS
Size the size for adjusting the bias voltage of the first, second smooth phase-shifter can be realized.Particularly passing through will be described inclined
Set voltage VBIASIt is shorted with the operating voltage VCC of the current mode logic drive module, need to only be patrolled by adjusting the current-mode
The common mode DC level for collecting the high-speed-differential driving signal that drive module is exported can be realized and adjust the first smooth phase-shifter
Bias voltage and the second smooth phase-shifter bias voltage purpose.It follows that the present invention do not need setting it is for example straight
Stream biasing module or DC voltage excluder (DC Block) etc. be used for adjust the described first smooth phase-shifter bias voltage and
Additional component required for the bias voltage of the second smooth phase-shifter realizes hardware required for saving optical transmitting set
Cost, and reduce the purpose of the circuit area of optical transmitting set.
In another aspect, the other end of two terminating resistors in termination module in the present invention, which interconnects, (forms section
Point X) it is connect afterwards with the termination capacitor, one side eliminates the DC component on signal wire, on the other hand also reduces institute
The common mode DC level for stating current mode logic drive module output high-speed-differential driving signal, improves the reversed of the modulator
Bias voltage, and then also improve the modulation effect of the modulator.And with provided termination module phase in the prior art
Than since the common-mode voltage of the node in termination module in the prior art is by amplifier in the current mode logic drive module
It determines, the common-mode voltage of node can be expressed as VCC-0.5IbRLIt follows that although termination module can in the prior art
Realize the common-mode voltage purpose for reducing node, but there is also common-mode voltages to be easy drift and asking vulnerable to influence of noise simultaneously
Topic.Therefore, in order to solve above-mentioned this problem, in the present invention in provided termination module, due to its first terminating resistor
It is connected to power supply after being connect respectively with termination capacitor with the second terminating resistor, which still may be implemented isolation direct current
Stream (therefore the transmission line electrode of the traveling wave Mach-Zehnder modulators is flowed through without DC current path, to realize reduction
The purpose of DC power), realize the purpose for stabilizing the common-mode voltage of nodes X, and realized to a certain extent to the height
Speed difference divides the common code impedance of driving signal to match.It, can be obvious by increasing termination capacitor for termination module of the present invention
The common-mode voltage of stable node X, and then inhibit the high pressure difference driving signal reflection of distal end, it is not easy it affected by noise, mentions
The transmission quality of the high high pressure difference driving signal.That is, the present invention is driven by the high-speed-differential for being exported the modulator
Dynamic signal is input to the termination module middle impedance build-out resistor (terminating resistor) and via matching capacitance (termination capacitor) and electricity
The design scheme of source connection is realizing the matching of remote signaling differential-mode impedance (to high-speed-differential driving signal progress differential mode resistance
Anti- matching) basis on, DC component can not be eliminated by eliminating in the design scheme of previous directly series resistance connection power supply
The drawbacks of, and the output common mode voltage of the current mode logic drive module is reduced, improve the reversed inclined of the modulator
Pressure, and then also improve the modulation effect of modulator；In addition to this, remote signaling common code impedance is also realized by matching capacitance
Matching (carries out common code impedance matching to the high-speed-differential driving signal), and stabilizes the voltage of its quiescent point, eliminates
Common-mode noise.To sum up, the present invention have save hardware cost, reduce DC power, increase device operation stability with make
With the service life, reduce complex circuit designs degree, conducive to high-density multi-channel Integrated design the advantages of.
Detailed description of the invention
Fig. 1 is the simple structure schematic diagram of the optical transmitting set in the prior art using AC coupled modes；
Fig. 2 is the simple structure schematic diagram of the optical transmitting set in the prior art using direct coupling system；
Fig. 3 is a kind of primary structure schematic diagram for optical transmitting set that one embodiment of the invention provides；
Fig. 4 is that the jitter amplitude of the nodes X in a kind of optical transmitting set that one embodiment of the invention provides is big with termination capacitor C
The curve graph of small variation；
The transient state without nodes X in the case of termination capacitor is imitative in a kind of optical transmitting set that Fig. 5 provides for one embodiment of the invention
True waveform；
Fig. 6 is the nodes X in the case where accessing 50pF termination capacitor in a kind of optical transmitting set provided in an embodiment of the present invention
Transient waveform.
Specific embodiment
It holds as stated in the background art, in the prior art high DC power present in optical transmitting set, high circuit complexity, with
And the problem of increasing the area for occupying optical transmitting set circuit, being unfavorable for the Integrated design of high-density multi-channel.The study found that right
In the optical transmitting set using AC coupled modes, specifically as shown in Figure 1, comprising: current mode logic drive module 11, direct current biasing
Module 12, Mach-Zehnder modulators 13 and termination module 14, the current mode logic drive module 11 pass through direct current biasing mould
Block 12 is connect with the Mach-Zehnder modulators 13, i.e., the current mode logic drive module 11 using AC coupled modes with
The Mach-Zehnder modulators connection, the Mach-Zehnder modulators 13 are attached with the termination module 14, institute
Current mode logic drive module 11 is stated for providing high-speed-differential driving signal；The direct current biasing module 12 is used for the horse
Conspicuous-Zeng Deer modulator 13 provides bias voltage；Mach-Zehnder modulators 13 are used for according to the high-speed-differential driving signal
The optical signal inputted to external light source is modulated to obtain the modulated optical signal and export；The termination module 14 is used
Impedance matching is carried out in the high-speed-differential driving signal exported to the Mach-Zehnder modulators 13, because of Mach-Zehnder
Your the transmission line electrode of modulator 13 is usually longer, so needing to be arranged the termination module 14.The Mach-Zehnder modulation
Device 13 can be traveling wave Mach-Zehnder modulators.The AC coupled modes can individually adjust the modulation of traveling wave Mach-Zehnder
The bias voltage of device 13, and make current mode logic drive module 11 and the work of traveling wave Mach-Zehnder modulators 13 inclined
State is set not interfere with each other.But because the inductance capacitance value of direct current biasing module 12 is larger, it usually needs additional component,
The area for occupying larger optical transmitting set circuit structure design is unfavorable for the integrated circuit structure design of high-density multi-channel photoelectricity.
For the optical transmitting set using direct coupling system, as shown in Fig. 2, it mainly includes that open-drain (open-drain) drives
Dynamic device 21, traveling wave Mach-Zehnder modulators 22 and distal end load 23, wherein the structure is by distal end termination module (institute as shown in figure 1
The termination module 14 stated) it is combined into one to form the distal end load 23 with load resistance.The design of the optical transmitting set is due to described
Open-drain driver does not have terminating resistor (two resistance R of the current mode logic drive module 11 as shown in Figure 1L) exist
Stronger optical signal reflection influences the integrality of optical signal transmission, while in the transmission line of traveling wave Mach-Zehnder modulators electricity
With the presence of larger DC current on extremely, DC power is increased, so as to cause device heating, reduces the stability of device operation
And the problem of service life.
Based on the studies above, the present invention provides a kind of optical transmitting set, specifically includes that current mode logic drive module (electricity
Flow mode logic driver), modulator and termination module；Using direct coupling system by the current mode logic drive module and institute
The input terminal connection for stating modulator, for exporting high-speed-differential driving signal；Using direct coupling system by the modulator
Output end is connect with the input terminal of the termination module；The modulator is used for according to the high-speed-differential driving letter received
Number its optical signal is modulated to obtain modulated optical signal and be exported；The termination module is used for the height that will be received
Speed difference divides driving signal to carry out impedance matching.
The present invention does not need setting such as direct current biasing by using direct coupling system (direct-coupled driving method)
Additional component, has been saved required for optical transmitting set required for module or DC voltage excluder (DC Block) etc.
Hardware cost, and reduce the area for occupying optical transmitting set.
In addition, the adjusting for the light phase-shifter bias voltage in the modulator, it can be by adjusting current mode logic
Output DC voltage and the accessed bias voltage V of light phase-shifter described in drive moduleBIASBetween voltage difference.It can be by bias voltage
VBIASIt is shorted with the operating voltage VCC of current mode logic drive module, it only need to be by adjusting the output of current mode logic drive module
High-speed-differential driving signal common mode DC level, i.e., the bias voltage of adjustable phase-shifter.
The termination module middle impedance matching is input to by the high-speed-differential driving signal for being exported the modulator
Resistance (terminating resistor) and the design scheme connected to power supply via matching capacitance (termination capacitor) are realizing remote signaling differential mode
On the basis of impedance matching (carrying out differential-mode impedance matching to the high-speed-differential driving signal), previous directly series connection is eliminated
The drawbacks of DC component can not be eliminated in the design scheme of resistance connection power supply, and reduce the current mode logic drive module
Output common mode voltage, improve the reverse biased of the modulator, and then also improve the modulation effect of modulator；Except this with
Outside, remote signaling common code impedance matching is also realized by matching capacitance and (common mode resistance is carried out to the high-speed-differential driving signal
Anti- matching), and the voltage of its quiescent point is stabilized, eliminate common-mode noise.To sum up, the present invention solves in the prior art
High DC power, high circuit complexity in the presence of optical transmitting set, and the area for occupying optical transmitting set circuit is increased, no
Conducive to high-density multi-channel Integrated design the problem of.
A kind of optical transmitting set proposed by the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
According to following explanation, advantages and features of the invention will be become apparent from.In order to enable objects, features and advantages of the present invention more
It becomes apparent, please refers to attached drawing.It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to match
The revealed content of specification is closed, so that those skilled in the art understands and reads, is not intended to limit the invention implementation
Qualifications, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size,
It does not influence still fall in disclosed technology contents under the effect of present invention can be generated and the purpose that can reach
In the range of capable of covering.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
As shown in figure 3, the present embodiment provides a kind of optical transmitting sets, comprising: current mode logic drive module 101, modulator
102 and termination module 103；Using direct coupling system by the current mode logic drive module 101 and the modulator 102
Input terminal connection, the current mode logic drive module 101 is for generating and exporting high-speed-differential driving signal；Using direct coupling
The output end of the modulator 102 is connect by conjunction mode with the input terminal of the termination module 103；The modulator 102 is used for
Its optical signal is modulated to obtain modulated optical signal and be exported according to the high-speed-differential driving signal received；Institute
Termination module 103 is stated for the high-speed-differential driving signal received to be carried out impedance matching.In the present embodiment, described
The input terminal of modulator 102 can be defined as proximal end, and the output end of the modulator 102 can be defined as distal end.The modulation
Device 102 is optical modulator, is specifically as follows traveling wave Mach-Zehnder modulators.
Further, the current mode logic drive module 101 further comprises: load resistance 1012 is total to
Source common gate structure 1011, input are to pipe 1010 and tail current source Ib；
The first end of the load resistance 1012 accesses the operating voltage VCC of the current mode logic drive module 101,
Second end is connect with the drain electrode of the cascode structure 1011；
The source electrode of the cascode structure 1011 connect the collector of pipe 1010 with the input；
The input is to the emitting stage of pipe 1010 through the tail current source IbGround connection；
The load resistance 1012 is used to carry out proximal end impedance matching (i.e. to not yet to the high-speed-differential driving signal
The high pressure difference driving signal that output end by the current mode logic drive module 101 is exported carries out impedance
With) and by it is described input high-speed-differential voltage signal is converted into the current signal that pipe 1010 generates；
The cascode structure 1011 is used to be isolated the input to the drain output and current mode logic of pipe 1010
The output end of drive module 101, to reduce the influence of the Miller effect；
The input is used to convert high-speed-differential current signal for the high-speed-differential voltage signal (i.e. high to pipe 1010
Speed difference divides driving signal)；
The tail current source Ib is used to be arranged the output voltage swing of the high-speed-differential driving signal.
Optionally, the load resistance 1012 includes the load electricity of two the first load resistance RL1 parallel with one another and second
Hinder RL2；The first end of the first load resistance RL1 and the second load resistance RL2 are respectively connected to the current mode logic driving
The operating voltage VCC of module；The second end of the first load resistance RL1 and the second load resistance RL2 respectively with the common source
The drain electrode of common gate structure connects.The cascode structure 1011 includes two grids the first field-effect tube M interconnectedc1With
Second field-effect tube Mc2；The input includes the first bipolar junction transistor (or cmos device) Q to pipe1With the second dipole
Transistor (or cmos device) Q2；Wherein, the first bipolar junction transistor Q1Base stage input positive polarity voltage signal
Vinp, the second bipolar junction transistor Q2Base stage input negative polarity voltage signal Vinn。
Optionally, the modulator 102 includes: the first smooth phase-shifter 1020, the second smooth phase-shifter 1021, input light light splitting
Device 1024A and output light splicer 1024B.
The first smooth phase-shifter 1020 includes first transmission line electrode 1120 and second transmission line electrode 1121.
The second smooth phase-shifter 1021 includes third transmission line electrode 1221 and the 4th transmission line electrode 1222.
One end of the second transmission line electrode 1121 and the second load resistance RL2Second end connection, the other end
It is connect with the input terminal of the termination module 103.
First load resistance R described in one end of the 4th transmission line electrode 1222L1Second end connection, the other end with
The input terminal of the termination module 103 connects.
The first transmission line electrode 1120 and third transmission line electrode 1221 are connected in parallel and access bias voltage
VBIAS；In the present embodiment, the first transmission line electrode 1120 and third transmission line electrode 1221 are RF earth signal
Transmit line electrode.
The bias voltage VBIASWith the common mode of the current mode logic drive module 101 output high-speed-differential driving signal
The voltage difference of DC level is the bias voltage of the described first, second smooth phase-shifter.By adjusting bias voltage VBIASSize
The size for adjusting the bias voltage of the first, second smooth phase-shifter can be realized.It follows that the present invention does not need setting example
Additional component, realizes saving light as required for direct current biasing module or DC voltage excluder (DC Block) etc.
Hardware cost required for transmitter, and reduce the purpose for occupying the area of optical transmitting set.
Preferably, at least one is arranged at intervals between the first transmission line electrode 1120 and second transmission line electrode 1121
A PN junction optical waveguide 1025；It is arranged at intervals at least between the third transmission line electrode 1221 and the 4th transmission line electrode 1222
One PN junction optical waveguide 1025, each PN junction optical waveguide 1025 is for respectively by the 4th transmission line electrode 1222 and institute
It states on digital data modulation to optical signal entrained in the high-speed-differential driving signal on 1121 electrode of second transmission line electrode.
The input optical splitter 1024A is for being divided into two-way branch optical signal for optical signal and exporting；First light
Phase-shifter 1020 and the second smooth phase-shifter 1021 are used to be divided described in two-way respectively according to the high-speed-differential driving signal
Branched optical signal is modulated, and the correspondence of digital information entrained by the high-speed-differential driving signal is loaded into branch described in two-way
In optical signal, to obtain the modulated branch's optical signal of two-way and export；The output light splicer 1024B will be for that will receive
Two-way described in modulated branch's optical signal synthesize modulated optical signal all the way and export, at this point, its be the light hair
The optical signal that emitter is issued.In the present embodiment, the input optical splitter 1024A is specially half optical splitter, is used
In the optical signal is divided into branch's optical signal described in two-way in the light splitting ratio of 1:1；The output splicer 1024B is specially
Two-in-one splicer is used to synthesize modulated branch optical signal described in the two-way, obtains described through adjusting all the way
The optical signal of system.
Further, the modulator 102 further include: input optical interface 1023A and output optical interface 1023B；It is described defeated
Enter optical interface 1023A to connect with the input optical splitter 1024A, for inputting the optical signal to the input optical splitter；Institute
It states output optical interface 1023B to connect with the output splicer 1024B, for exporting the modulated optical signal all the way.?
In the present embodiment, the input optical interface 1023A also accesses the light source for being provided with the optical signal.
Preferably, the termination module 103 includes: the first terminating resistor R1, the second terminating resistor R2With termination capacitor CT；
The first terminating resistor R1With the second terminating resistor R2It is parallel with one another, the first terminating resistor R1First end and described the
Four transmission line electrode connections, second end and the termination capacitor CTFirst end connection；The second terminating resistor R2First
End is connect with the second transmission line electrode, second end and the termination capacitor CTFirst end connection；The termination capacitor CT
Second end access the operating voltage VCC of the termination module.The first terminating resistor R1With the second terminating resistor R2For right
High-speed driving signals carry out differential-mode impedance matching, the first terminating resistor R1With the second terminating resistor R2Resistance value respectively with
The first smooth phase-shifter 1020 is consistent with the characteristic impedance of the described second smooth phase-shifter 1021.
The load resistance 1012 of the current mode logic drive module 101 of the invention is played to the high-speed-differential
The first, second of driving signal, the effect of the impedance matching at proximal end, the resistance value of load resistance 1012 and the modulator
The characteristic impedance of the transmission line electrode of light phase-shifter is consistent, it is preferable that can be 30 Ω (the first load resistance RL1Resistance
Value is 30 Ω, the second load resistance RL2Resistance value be 30 Ω).The first terminating resistor R1With the second terminating resistor R2For
To differential-mode impedance matching of the high-speed-differential driving signal at distal end, the first terminating resistor R1With the second terminating resistor
R2Resistance value it is consistent with the transmission characteristic impedance of line electrode of the first, second smooth phase-shifter of the modulator respectively, it is excellent
Choosing, can be 30 Ω (the first terminating resistor R1Resistance value be 30 Ω, the second terminating resistor R2Resistance value be 30 Ω).
(termination as mentioned in the background directly is held for scheme that the distal end terminating resistor other end connects to power supply is different from other
Module), in embodiments of the present invention the other end of two terminating resistors interconnect and (form nodes X) afterwards with termination capacitor CTEven
It connects, one side eliminates the DC component on signal wire, on the other hand also reduces the output of current mode logic drive module 101
The common mode DC level of high-speed-differential driving signal, improves the reverse bias voltage of modulator 102, and then also improves modulation
The modulation effect of device.
In addition, the common-mode voltage due to the nodes X (is not shown by amplifier in current mode logic drive module 101 in figure
It determines out), the common-mode voltage of nodes X can be expressed as VCC-0.5IbRL in the present embodiment, although reducing being total to for nodes X
Mode voltage, but there is also common-mode voltage it is easy drift simultaneously and the problem of vulnerable to influence of noise.Therefore, in order to solve it is above-mentioned this
A problem, in the present embodiment provided by termination module 103, due to its first terminating resistor R2 and the second terminating resistor R1 divide
Not with termination capacitor CTIt is connect after connection with power supply VCC, on the one hand, isolation DC current still may be implemented in it, on the other hand
It realizes the purpose for stabilizing the common-mode voltage of nodes X, and is realized to a certain extent to the high-speed-differential driving signal
Common code impedance matching.In the present embodiment, for being directed to difference under the conditions of the transmission rate of 25Gbps NRZ digital signal
The termination capacitor of size, nodes X shake the situation of change of the amplitude of oscillation as shown in Fig. 4, Fig. 5 and Fig. 6, it can be seen that are terminated by increasing
Capacitor can obvious stable node X common-mode voltage, and then inhibit the high pressure difference driving signal reflection of distal end, so that institute
It states high pressure difference driving signal and is not easy affected by noise, improve the high pressure difference driving signal quality.
A kind of direct-coupled traveling wave Mach-Zehnder modulators and electric current are used in optical transmitting set in the present embodiment
The circuit connection of mode logic drive module (current mode logic driver) designs, by with the circuit connection design scheme, can be with
Save needed for (BIAS TEE) module of direct current biasing in conventional circuit design or DC voltage excluder (DC Block) compared with
Big inductance, capacitor element, save the area of optical transmitting set.In for differential mode and the common mode termination that termination module had both met
Match, and due to being coupled on power supply VCC not over capacitor AC, flows through the traveling wave Mach-without DC current path
The transmission line electrode of Zeng Deer modulator, to realize the purpose for reducing DC power.
In conclusion the present invention does not need setting for example by using direct coupling system (direct-coupled driving method)
Additional component, has saved optical transmitting set required for direct current biasing module or DC voltage excluder (DC Block) etc.
Required hardware cost, and reduce the area for occupying optical transmitting set.
In addition, the adjusting for the light phase-shifter bias voltage in the modulator, it can be by adjusting current mode logic
Output DC voltage and the accessed bias voltage V of light phase-shifter described in drive moduleBIASBetween voltage difference.It specifically can be by institute
State bias voltage VBIASIt is shorted with the operating voltage VCC of the current mode logic drive module, it only need to be by adjusting the electric current
The common mode DC level for the high-speed-differential driving signal that mode logic drive module is exported can be realized and adjust the first light phase
Move the purpose of the bias voltage of device and the bias voltage of the second smooth phase-shifter.
The termination module middle impedance matching is input to by the high-speed-differential driving signal for being exported the modulator
Resistance (terminating resistor) and the design scheme connected to power supply via matching capacitance (termination capacitor) are realizing remote signaling differential mode
On the basis of impedance matching (carrying out differential-mode impedance matching to the high-speed-differential driving signal), previous directly series connection is eliminated
The drawbacks of DC component can not be eliminated in the design scheme of resistance connection power supply, and reduce the current mode logic drive module
Output common mode voltage, improve the reverse biased of the modulator, and then also improve the modulation effect of modulator；Except this with
Outside, remote signaling common code impedance matching is also realized by matching capacitance and (common mode resistance is carried out to the high-speed-differential driving signal
Anti- matching), and the voltage of its quiescent point is stabilized, eliminate common-mode noise.To sum up, the present invention solves in the prior art
High DC power, high circuit complexity in the presence of optical transmitting set, and the area for occupying optical transmitting set circuit is increased, no
Conducive to high-density multi-channel Integrated design the problem of.
The above is only a preferred embodiment of the present invention, does not play the role of any restrictions to the present invention.Belonging to any
Those skilled in the art, in the range of not departing from technical solution of the present invention, to the invention discloses technical solution and
Technology contents make the variation such as any type of equivalent replacement or modification, belong to the content without departing from technical solution of the present invention, still
Within belonging to the scope of protection of the present invention.
Claims (12)
1. a kind of optical transmitting set characterized by comprising
Current mode logic drive module, modulator and termination module；
The current mode logic drive module is connect with the input terminal of the modulator using direct coupling system, the electric current
Mode logic drive module is for generating and exporting high-speed-differential driving signal；
The output end of the modulator is connect with the input terminal of the termination module using direct coupling system；The modulator
For being modulated to obtain modulated optical signal and defeated to its optical signal according to the high-speed-differential driving signal that receives
Out；
The termination module is used to the high-speed-differential driving signal received carrying out distal end impedance matching.
2. optical transmitting set as described in claim 1, which is characterized in that the current mode logic drive module includes: load electricity
Resistance, cascode structure, input are to pipe and tail current source；
The first end of the load resistance accesses the operating voltage VCC of the current mode logic drive module, second end and institute
State the drain electrode connection of cascode structure；
The source electrode of the cascode structure connect the collector of pipe with the input；
The input is grounded the emitting stage of pipe through the tail current source；
The load resistance is used to carry out the high-speed-differential driving signal proximal end impedance matching and by the input to pipe
The current signal of generation is converted into high-speed-differential voltage signal；
The cascode structure is used to be isolated drain output and the current mode logic drive module of the input to pipe
Output end, to reduce the influence of the Miller effect；
The input is used to pipe convert high-speed-differential driving signal for the high-speed-differential voltage signal；
The tail current source is used to be arranged the output voltage swing of the high-speed-differential driving signal.
3. optical transmitting set as claimed in claim 2, which is characterized in that the load resistance includes the first load parallel with one another
Resistance RL1With the second load resistance RL2；
The first load resistance RL1With the second load resistance RL2First end be respectively connected to the current mode logic drive module
Operating voltage VCC；
The first load resistance RL1With the second load resistance RL2Second end respectively with the drain electrode of the cascode structure connect
It connects；
The cascode structure includes grid the first field-effect tube M interconnectedc1With the second field-effect tube Mc2；
The input includes the first bipolar junction transistor Q to pipe1With the second bipolar junction transistor Q2；Wherein, described first pair
Pole junction transistor Q1Base stage input positive polarity voltage signal Vinp, the second bipolar junction transistor Q2Base stage input
The voltage signal V of negative polarityinn。
4. optical transmitting set as claimed in claim 3, which is characterized in that the modulator is traveling wave Mach-Zehnder modulators.
5. optical transmitting set as claimed in claim 4, which is characterized in that the modulator includes: the first smooth phase-shifter, the second light
Phase-shifter, input light optical splitter and output light splicer；
The first smooth phase-shifter includes first transmission line electrode and second transmission line electrode；
The second smooth phase-shifter includes third transmission line electrode and the 4th transmission line electrode；
One end of the second transmission line electrode and the second load resistance RL2Second end connection, the other end and the end
The input terminal of connection module connects；
First load resistance R described in one end of the 4th transmission line electrodeL1Second end connection, the other end and the termination
The input terminal of module connects；
The first transmission line electrode and third transmission line electrode are connected in parallel and access bias voltage VBIAS；
The input optical splitter is for being divided into two-way branch optical signal for optical signal and exporting；
The first smooth phase-shifter and the second smooth phase-shifter are used for according to the high-speed-differential driving signal respectively to two-way
Branch's optical signal is modulated, and the correspondence of digital information entrained by the high-speed-differential driving signal is loaded into two-way institute
It states in branch's optical signal, to obtain the modulated branch's optical signal of two-way and export；
The output light splicer is modulated all the way for synthesizing modulated branch optical signal described in the two-way received
Optical signal and output.
6. optical transmitting set as claimed in claim 5, which is characterized in that the modulator further include: input optical interface and output
Optical interface；
The input optical interface is connect with the input optical splitter, for inputting the optical signal to the input optical splitter；
The output optical interface is connect with the output splicer, for exporting the modulated optical signal all the way.
7. optical transmitting set as claimed in claim 6, which is characterized in that the input optical splitter is half optical splitter,
For the optical signal to be divided into branch's optical signal described in two-way in the light splitting ratio of 1:1；
The output splicer is two-in-one splicer, is used to close modulated branch optical signal described in the two-way
At obtaining the modulated optical signal all the way.
8. optical transmitting set as claimed in claim 7, which is characterized in that
At least one PN junction optical waveguide is arranged at intervals between the first transmission line electrode and second transmission line electrode；
At least one PN junction optical waveguide is arranged at intervals between the third transmission line electrode and the 4th transmission line electrode.
9. optical transmitting set as claimed in claim 8, which is characterized in that the termination module includes: the first terminating resistor R1,
Two terminating resistor R2With termination capacitor CT；
The first terminating resistor R1With the second terminating resistor R2It is parallel with one another, the first terminating resistor R1First end and institute
State the 4th transmission line electrode connection, second end and the termination capacitor CTFirst end connection；
The second terminating resistor R2First end connect with the second transmission line electrode, second end and the termination capacitor
CTFirst end connection；
The termination capacitor CTSecond end access the operating voltage VCC of the termination module.
10. optical transmitting set as claimed in claim 9, which is characterized in that the first terminating resistor R1With the second terminating resistor R2
For carrying out the matching of distal end differential-mode impedance, the first terminating resistor R to High-speed driving signals1With the second terminating resistor R2Electricity
Resistance value is consistent with the characteristic impedance of the described first smooth phase-shifter and the second smooth phase-shifter respectively.
11. optical transmitting set as claimed in claim 10, which is characterized in that further include: by the bias voltage VBIASWith the electricity
The operating voltage VCC for flowing mode logic drive module is shorted, by the high speed difference for adjusting the current mode logic drive module output
Divide the common mode DC level of driving signal, to adjust the bias voltage of the described first smooth phase-shifter and the second smooth phase-shifter.
12. optical transmitting set as claimed in claim 11, which is characterized in that the first smooth phase-shifter and the second smooth phase-shifter
Bias voltage is respectively the bias voltage VBIASIt is driven with the high-speed-differential of current mode logic drive module output
The voltage difference of the common mode DC level of signal.
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| CN113922886A (en) * | 2021-09-01 | 2022-01-11 | 烽火通信科技股份有限公司 | Chirp compensation method and driver for optical modulator |
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| WO2023134597A1 (en) * | 2022-01-14 | 2023-07-20 | Huawei Technologies Co., Ltd. | Method, apparatus and system for limited-range impedance tuning for silicon photonics devices |
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| CN114063321A (en) * | 2022-01-06 | 2022-02-18 | 成都明夷电子科技有限公司 | Silicon photon push-pull microphone Jeda modulator with double differential electrodes |
| CN114063321B (en) * | 2022-01-06 | 2022-04-22 | 成都明夷电子科技有限公司 | Silicon photon push-pull microphone Jeda modulator with double differential electrodes |
| WO2023134597A1 (en) * | 2022-01-14 | 2023-07-20 | Huawei Technologies Co., Ltd. | Method, apparatus and system for limited-range impedance tuning for silicon photonics devices |
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