CN107124225A - A kind of high speed PAM4 optical transceiver modules based on DML - Google Patents
A kind of high speed PAM4 optical transceiver modules based on DML Download PDFInfo
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- CN107124225A CN107124225A CN201710133814.6A CN201710133814A CN107124225A CN 107124225 A CN107124225 A CN 107124225A CN 201710133814 A CN201710133814 A CN 201710133814A CN 107124225 A CN107124225 A CN 107124225A
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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
- H04B10/40—Transceivers
-
- 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
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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
- H04B10/524—Pulse modulation
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
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- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The present invention relates to optical module technical field, there is provided a kind of high speed PAM4 optical transceiver modules based on DML.Wherein optical transceiver module includes interface unit, PAM4 system conversion unit, DML Optical Transmit Units and light receiving unit：Interface unit connects PAM4 system conversion units, and the NRZ electric signals for passing through the first code check that interface unit is passed over give PAM4 system conversion units；PAM4 system conversion units are also connected with DML Optical Transmit Units and light receiving unit, and PAM4 system conversion units are additionally operable to receive the electric signal of the 2nd PAM4 modulation format forms of light receiving unit generation.The embodiment of the present invention can be realized using the module of PAM4 modulating modes only needs to 25G emitting modules all the way and 25G receiving units can reach the signal transmission rate of 50G bit rates all the way, compared with the NRZ modulating mode modules of phase same rate, simple, small volume and the low advantage of cost with modular structure.
Description
【Technical field】
The present invention relates to optical module technical field, more particularly to a kind of high speed PAM4 optical transceiver modules based on DML.
【Background technology】
The quick application of internet and intelligent terminal makes global metadata amount be in explosive growth, and this is wanted to Internet bandwidth
Ask with regard to more and more higher.It is how maximized using existing network foundation resource optimization cost, and realize that message transmission rate is turned over
Turn into ultimate challenge again.At present backboard, system and short-range optical fiber transmission in, it is common to use be 10Gbps/
25Gbps/28Gbps NRZ transmission means.But when transmission rate is more than 28G and when developing to higher rate, the telecommunications such as backboard
Number transmission can produce worse loss to high-frequency signal, and the modulation of use higher order, such as PAM4 standards, in identical bandwidth
Under can transmit more data.
The solution that conventional 40G/100G transceiver modules are used at present passes for 4 parallel passage 10G/25G NRZ codes
It is defeated, it is necessary to use 4 groups of transmittings and receiving unit, cost is high, complicated.Transmitted using PAM4 standards, it is only necessary to the group of half
Part is that can be achieved and NRZ code identical data transfers.
Scheme using the module emitting portion of PAM4 standards typically has：Utilize the driving EML laser transmittings of EML drivers
High-speed optical signal (optical transceiver module that CN 106100747A are modulated based on PAM4)；EML schemes are had using voltage signal driving
The advantage of linear field width, but it is equally faced with construction complexity, power consumption is big, the problem of with high costs.It is linear that this case is used
DML drivers combine the transmitter unit realized with DML lasers to be had substantially relative to EML launch scenarios relative to EML schemes
Small power consumption, the low advantage of cost.
In addition using the transmission of PAM4 standards, under identical maximum signal amplitudes, PAM4 signals can use 4 level progress
Signal is transmitted, and the amplitude difference between every two neighboring level only has 1/3 in the case of NRZ.Signal is highly susceptible to the dry of noise
Disturb and produce error code.Therefore it is required that the continuity of transmitting terminal and receiving terminal the guarantee high frequency electrical signal in module, reduces high frequency and damages
Consumption, to reach that amplitude output signal is maximized.It is general between LD and driver, driver and ceramic cartridge inside optical sender
Connected by way of gold thread bonding；Photodetector and trans-impedance amplifier, trans-impedance amplifier and ceramics inside photoreceiver
It is also to be connected by way of gold thread bonding between shell.And ceramic cartridge is then connected with module pcb board by high frequency soft ribbons.It is high
Frequency signal amplitude can all produce decay when being transmitted on gold thread and soft ribbons, and decay can increase as signal rate increases.
【The content of the invention】
The embodiment of the present invention is used to solve with the increase of transmission rate, using the high-speed optical module knot of traditional NRZ standards
Structure is complicated, with high costs；And add PAM4 patterns to work using (10Gbps~60Gbps) Electroabsorption Modulated Laser EML at a high speed
Principle is complicated, the problem of power consumption is big.
Further, the embodiment of the present invention is additionally operable to solve to be directed to PAM4 standard signals to noise and transmits the quick of amplitude fading
Perception, the high frequency signal transmission loss problem caused.
The embodiment of the present invention is adopted the following technical scheme that：
In a first aspect, the embodiments of the invention provide a kind of high speed PAM4 optical transceiver modules based on DML, optical transceiver module
Including interface unit, PAM4 system conversion unit, DML Optical Transmit Units and light receiving unit：
The interface unit connects PAM4 system conversion units, for pass through that the interface unit passes over the
The NRZ electric signals of one code check give the PAM4 system conversion unit；
The PAM4 system conversion unit is also connected with DML Optical Transmit Units and light receiving unit, for by described first yard
The NRZ electric signals of rate are converted into the electric signal of the first PAM4 modulation format forms, and hand to the DML Optical Transmit Units, with
Toilet states DML Optical Transmit Units and launches the PAM4 encoded signals with laser signal；Wherein, the first PAM4 modulation format lattice
The code check of the electric signal of formula is the first code check；
The PAM4 system conversion unit is additionally operable to receive the 2nd PAM4 modulation format forms of light receiving unit generation
Electric signal, and the electric signal of the 2nd PAM4 modulation format forms is converted into after the second nrz encoding electric signal, pass to institute
State interface unit；Wherein, the code check of the second nrz encoding electric signal is the first code check.
Optionally, the PAM4 system conversion unit includes PAM4 standards coding unit and PAM4 standard decoding units, institute
Stating interface unit includes main frame receiving port and host sending end mouthful,
PAM4 standards coding unit connects the main frame receiving port, is received for obtaining by the main frame receiving port
The code check of two-way first NRZ electric signals, and the electric signal of the first PAM4 modulation format forms all the way is converted to, by line side
Sending port is exported；
PAM4 standards decoding unit is used to obtain the 2nd PAM4 modulation format lattice all the way that the receiving port in line side is received
The electric signal of formula, and the NRZ electric signals of two-way the 2nd are decoded as, exported by host sending end mouthful.
Optionally, the PAM4 standards coding unit includes CAUI receiving units, two clock data recovery circuits, 2:1
Electric signal multiplexer, forward error correction coding unit and PAM4 encoders,
The CAUI receiving units obtain the NRZ electric signals of the code check of two-way first of main frame receiving port；When described two
Clock data recovery circuit is used for the recovery that clock data is carried out to the NRZ electric signals of first code check, the two-way after recovery the
The NRZ electric signals of one code check reach 2:1 electric signal multiplexer；2:1 electric signal multiplexer is used for the code check of two-way first
NRZ electric signals are multiplexed with the NRZ electric signals of the second code check all the way, and the electric signal transmission code after multiplexing passes through forward error correction coding list
Member adds redundant correcting code, and is transmitted to PAM4 encoders；The PAM4 encoders are used to change the NRZ electric signals of the second code check
For the electric signal of the first PAM4 modulation format forms of the first code check, and sent by line side sending port to DML light and launch single
Member；Wherein, the speed of the second code check is twice of the first code check speed.
Optionally, the PAM4 standards decoding unit includes analog-digital converter, digital signal processing unit, 1:2 electric signals
Demultiplexer, decoding FEC unit and CAUI transmitter units,
AD conversion unit, for the line-side interface to be received into the of the first code check all the way that light receiving unit is sent
The electric signal of two PAM4 modulation format forms is converted to data signal；
The digital signal processing unit, the data signal for AD conversion unit to be obtained is converted to NRZ tune
The electric signal of second code check of form processed；
Described 1:2 electric signal demultiplexers, for the electric signal of the second code check to be demultiplexing as into the second of 2 the first code checks of tunnel
Nrz encoding electric signal, and error correction decoding processing is carried out by decoding FEC unit, sent by host computer side CAUI transmitter units
To host sending end mouthful；
Wherein, the speed of the second code check is twice of the first code check speed.
Optionally, the DML Optical Transmit Units include linear DML drivers and DML lasers；
DML Linear actuators receive the differential voltage signal of PAM4 standard coding unit circuits side ports transmission and are converted to
Current drive signal drives DML lasers, and laser launches the optical signal of the first code check to exterior light net by module optical interface
Network；Wherein, the differential voltage signal corresponds to the electric signal of the first PAM4 modulation format forms.
Optionally, the DML Linear actuators are fixed in ceramic cartridge with DML lasers using golden tin solder, ceramics
Shell is inside and outside one layer of golden finger respectively, and two layers of golden finger is connected by high frequency transmission line, and outside golden finger passes through hot pressing
The mode of weldering is directly connected to realize power supply, monitoring and electric signal transmission with module pcb board golden finger；Internal golden finger passes through gold thread
The mode of bonding realizes and is electrically connected that DML Linear actuators are swashed by way of gold thread bonding with DML with DML Linear actuators
Light device is connected.
Optionally, the light receiving unit includes linear trans-impedance amplifier and photodetector,
The photodetector is used to receive the optical signal for the first code check that outside optical-fiber network is sent and is converted to faint
Current signal sends linear trans-impedance amplifier to；The linear trans-impedance amplifier is used to current signal being converted to differential voltage letter
Number send the line-side interface of PAM4 standard decoding units to；Wherein, the differential voltage signal correspondence and the 2nd PAM4
The electric signal of modulation format form.
Optionally, the linear trans-impedance amplifier is fixed in ceramic cartridge by conductive silver glue；The photodetector
Electrode is directly connected to using face-down bonding mode with linear trans-impedance amplifier electrode；Inside linear trans-impedance amplifier and ceramic cartridge
Golden finger between be attached by way of gold thread bonding；Photodetector is by the current signal after opto-electronic conversion via nation
Deposit line sends trans-impedance amplifier to, and the high-frequency voltage signal that trans-impedance amplifier is produced is sent to inside shell via bonding gold thread
Golden finger, high-frequency signal sends outside golden finger to via high frequency transmission line from internal golden finger.
Optionally, golden finger is then directly connected to by way of thermocompression bonding with module pcb board golden finger outside ceramic cartridge
Realize power supply, monitoring and high frequency signal transmission.
Optionally, the photodetector pad structure can be GS or GSG structures, corresponding trans-impedance amplifier radio frequency input
Pad structure is also GS the or GSG structures of correspondingly-sized.
The embodiment of the present invention only needs to 25G emitting modules all the way using the module of PAM4 modulating modes and 25G is received all the way
Component is the signal transmission rate that can reach 50G bit rates, compared with the NRZ modulating mode modules of phase same rate, with module
It is simple in construction, small volume and the low advantage of cost.
In addition, the embodiment of the present invention is realized using the linear DML drivers of 25G with the transmitter unit that 25G DML TOSA are constituted
The transmitting of 50G bps PAM4 optical signals.The program has lower power consumption and cost relative to EML schemes.
Further, the embodiment of the present invention obtains bigger output signal width to improve the continuity of module high frequency signal transmission
Degree.Light receiving unit realizes that photodetector and the radio frequency of linear trans-impedance amplifier (IC) are connected using reverse installation process, reduces gold
The high frequency signal attenuation that line bonding connected mode is introduced；Optical device shell golden finger directly uses thermocompression bonding with module PCB golden fingers
The mode of connecing realizes the connection of both golden fingers, reduces the electric signal loss that common soft ribbons connected mode is introduced.
【Brief description of the drawings】
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of schematic diagram of high speed PAM4 optical transceiver modules based on DML provided in an embodiment of the present invention；
Fig. 2 is a kind of structural representation of PAM4 system conversion unit provided in an embodiment of the present invention；
Fig. 3 is a kind of structural representation of DML Optical Transmit Units provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of light receiving unit provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram that a kind of photodetector provided in an embodiment of the present invention is connected with trans-impedance amplifier upside-down mounting；
Fig. 6 is a kind of optical device golden finger provided in an embodiment of the present invention and module pcb board golden finger connection diagram；
Fig. 7 is the schematic diagram of another high speed PAM4 optical transceiver modules based on DML provided in an embodiment of the present invention；
Fig. 8 is the schematic diagram of another high speed PAM4 optical transceiver modules based on DML provided in an embodiment of the present invention；
Fig. 9 is the schematic diagram of another high speed PAM4 optical transceiver modules based on DML provided in an embodiment of the present invention.
【Embodiment】
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In the description of the invention, term " interior ", " outer ", " longitudinal direction ", " transverse direction ", " on ", " under ", " top ", " bottom " etc. refer to
The orientation or position relationship shown be based on orientation shown in the drawings or position relationship, be for only for ease of description the present invention rather than
It is required that the present invention must be with specific azimuth configuration and operation, therefore it is not construed as limitation of the present invention.
As long as in addition, technical characteristic involved in each embodiment of invention described below is each other not
Constituting conflict can just be mutually combined.
Embodiment 1:
The embodiment of the present invention 1 provides a kind of high speed PAM4 optical transceiver modules based on DML, as shown in figure 1, the light is received
Sending out module includes interface unit 11, PAM4 system conversion unit 12, DML Optical Transmit Units 13 and light receiving unit 14：
The connection PAM4 system conversion of interface unit 11 unit 12, was transmitted for passing through the interface unit 11
The NRZ electric signals of the first code check come give the PAM4 system conversion unit 12；
The PAM4 system conversion unit 12 is also connected with DML Optical Transmit Units 13 and light receiving unit 14, for by described in
The NRZ electric signals of first code check are converted into the electric signal of the first PAM4 modulation format forms, and it is single to hand to the DML light transmitting
Member 13, so that the DML Optical Transmit Units 13 launch the PAM4 encoded signals with laser signal；Wherein, the first PAM4
The code check of the electric signal of modulation format form is the first code check；
The PAM4 system conversion unit 12 is additionally operable to receive the 2nd PAM4 modulation format lattice that light receiving unit 14 is generated
The electric signal of formula, and the electric signal of the 2nd PAM4 modulation format forms is converted into after the second nrz encoding electric signal, transmit
To the interface unit 11；Wherein, the code check of the second nrz encoding electric signal is the first code check.
The embodiment of the present invention only needs to the first code check (such as 25Gbps) transmitting all the way using the module of PAM4 modulating modes
Component and all the way the first code check receiving unit are the signal transmission rate that can reach second code rate (such as 50Gbps).It is synchronized with phase
The NRZ modulating mode modules of rate are compared, simple with modular structure, small volume and the low advantage of cost.
Wherein, so that the first code check is 25Gbps and the second code check is 50Gbps as an example, the 50G high speed PAM4 light based on DML
Transceiver module, due to using the modulation technique than NRZ higher order, it is only necessary to 25G emitting modules and all the way 25G receiving units all the way
It can reach the signal transmission rate of 50G bit rates.PAM4 modulating modes can make the structure of optical module simpler.Use in addition
The linear DML drivers of 25G combine the transmitter unit realized with 25G DML lasers can allow optical mode relative to EML launch scenarios
The power consumption of block realizes further decline with cost.
As shown in Fig. 2 be a kind of implementation of PAM4 system conversion unit 12 provided in an embodiment of the present invention, wherein,
The PAM4 system conversion unit 12 includes PAM4 standards coding unit 121 and PAM4 standards coding unit 122, the interface list
Member 11 includes main frame receiving port and host sending end mouthful,
PAM4 standards coding unit 121 connects the main frame receiving port, and the main frame receiving port is passed through for obtaining
The NRZ electric signals of the code check of two-way first of reception, and the electric signal of the first PAM4 modulation format forms all the way is converted to, by circuit
The sending port output of side；
PAM4 standards coding unit 122 is used to obtain the 2nd PAM4 modulation formats all the way that the receiving port in line side is received
The electric signal of form, and the NRZ electric signals of two-way the 2nd are decoded as, exported by host sending end mouthful.
Further, the embodiment of the present invention additionally provides the PAM4 standards coding unit 121 and PAM4 standards coding is single
A kind of concrete structure implementation of member 122, the PAM4 standards coding unit 121 includes CAUI receiving units, two clocks
Data recovery circuit, 2:1 electric signal multiplexer, forward error correction coding unit and PAM4 encoders,
The CAUI receiving units obtain the NRZ electric signals of the code check of two-way first of main frame receiving port；When described two
Clock data recovery circuit is used for the recovery that clock data is carried out to the NRZ electric signals of first code check, the two-way after recovery the
The NRZ electric signals of one code check reach 2:1 electric signal multiplexer；2:1 electric signal multiplexer is used for the code check of two-way first
NRZ electric signals are multiplexed with the NRZ electric signals of the second code check all the way, and the electric signal transmission code after multiplexing passes through forward error correction coding list
Member adds redundant correcting code, and is transmitted to PAM4 encoders；The PAM4 encoders are used to change the NRZ electric signals of the second code check
For the electric signal of the first PAM4 modulation format forms of the first code check, and sent by line side sending port to DML light and launch single
Member 13；Wherein, the speed of the second code check is twice of the first code check speed, such as described first code check is 25Gbps, described the
Two code checks are 50Gbps.In embodiments of the present invention, the first code check can in the range of 10Gbps~60Gbps value.
The PAM4 standards coding unit 122 includes analog-digital converter, digital signal processing unit, 1:2 electric signals are demultiplexed
With device, decoding FEC unit and CAUI transmitter units,
AD conversion unit, for the line-side interface to be received into the first code check all the way that light receiving unit 14 is sent
The electric signal of 2nd PAM4 modulation format forms is converted to data signal；The digital signal processing unit, for modulus to be turned
Change the electric signal that the data signal that unit obtains is converted to the second code check of NRZ modulation formats；Described 1:2 electric signals are demultiplexed
With device, for the electric signal of the second code check to be demultiplexing as to the second nrz encoding electric signal of 2 the first code checks of tunnel, and entangled by forward direction
Wrong decoding unit carries out error correction decoding processing, and host sending end mouthful is sent to by host computer side CAUI transmitter units；Wherein, second
The speed of code check is twice of the first code check speed, such as described first code check is 25Gbps, and second code check is 50Gbps.
As shown in Figure 3 (using the first code check as 25Gbps in figure, the second code check be 50Gbps exemplified by be shown), be this hair
A kind of DML Optical Transmit Units 13 that bright embodiment is provided realize structure, wherein, the DML Optical Transmit Units 13 include linear
DML drivers 131 and DML lasers 132；
DML Linear actuators receive the differential voltage signal of the circuit side ports transmission of PAM4 standards coding unit 121 and turned
Current drive signal driving DML lasers 132 are changed to, laser launches the optical signal of the first code check outside by module optical interface
Portion's optical-fiber network；Wherein, the differential voltage signal corresponds to the electric signal of the first PAM4 modulation format forms.
The embodiment of the present invention is realized using the linear DML drivers 131 of 25G with the transmitter unit that 25G DML TOSA are constituted
The transmitting of 50G bps PAM4 optical signals.The program has lower power consumption and cost relative to EML schemes.
As shown in Figure 4 (using the first code check as 25Gbps in figure, the second code check be 50Gbps exemplified by be shown), be this hair
A kind of light receiving unit 14 that bright embodiment is provided realizes structure, wherein, light receiving unit 14 includes linear trans-impedance amplifier
141 and photodetector 142.
The photodetector 142 is used to receive the optical signal for the first code check that outside optical-fiber network is sent and is converted to faint
Current signal send linear trans-impedance amplifier 141 to；The linear trans-impedance amplifier 141 is used to current signal being converted to difference
Divided voltage signal sends the line-side interface of PAM4 standards coding unit 122 to；Wherein, the differential voltage signal correspondence and institute
State the electric signal of the 2nd PAM4 modulation format forms..
With reference to the embodiment of the present invention, for the connected mode of DML Linear actuators and DML lasers 132, additionally provide
A kind of preferred implementation, specifically：The DML Linear actuators are fixed on pottery with DML lasers 132 using golden tin solder
In porcelain tube shell, ceramic cartridge is inside and outside one layer of golden finger respectively, and two layers of golden finger is connected by high frequency transmission line, outside gold
Finger is directly connected to realize power supply, monitoring and electric signal transmission by way of thermocompression bonding with module pcb board golden finger；Internal gold
Finger realizes and is electrically connected that DML Linear actuators pass through gold thread bonding by way of gold thread bonding with DML Linear actuators
Mode is connected with DML lasers 132.Wherein, the optical signals aspheric plus lens that DML lasers 132 are launched converges to shell
In outer ceramic optical fibre lock pin, lens and one isolator of lock pin intermediate arrangement.
On the other hand, with reference to the embodiment of the present invention, with regard to the connection side of linear trans-impedance amplifier 141 and photodetector 142
For formula, a kind of preferred implementation is also provided, specifically：The linear trans-impedance amplifier 141 is solid by conductive silver glue
It is scheduled in ceramic cartridge；The electrode of photodetector 142 is straight using face-down bonding mode and the linear electrode of trans-impedance amplifier 141
Connect in succession, as shown in Figure 5；Pass through the side of gold thread bonding between golden finger inside linear trans-impedance amplifier 141 and ceramic cartridge
Formula is attached；Photodetector 142 sends the current signal after opto-electronic conversion to trans-impedance amplifier via bonding gold thread, across
The high-frequency voltage signal that impedance amplifier is produced sends golden finger inside shell to via bonding gold thread, and high-frequency signal is kept pouring in via height
Defeated line sends outside golden finger to from internal golden finger.
Wherein, golden finger is then directly connected to reality by way of thermocompression bonding with module pcb board golden finger outside ceramic cartridge
Now power, monitor and high frequency signal transmission, as shown in Figure 6.
In implementation of the embodiment of the present invention, the pad structure of photodetector 142 can be GS or GSG structures, together
The corresponding trans-impedance amplifier radio frequency input pad structure of sample is also GS the or GSG structures of correspondingly-sized.Because chip can bear
Temperature limited, upside-down mounting solder must use solder, therefore be used as welding material from Au-Sn alloys.Au-Sn alloy ratios
Relation is 80%Au and 20%Sn, and consolute temperature is at 280 DEG C.Welding process is as follows：The protection for being welded on high pure nitrogen of chip
It is lower to carry out, first prefabricated golden tin solder is placed on trans-impedance amplifier (IC) pad, welding equipment suction nozzle picks up photoelectricity
Detector 142, using the pad locations for being directed at system alignment photodetector 142 and trans-impedance amplifier, then suction nozzle sinking makes
Both pad interval solders are obtained to be crimped onto together.Then warm table is gradually warming up to more than fusing point such as 330 DEG C, Sn during heating
Dissolve first, the Sn of fusing can dissolve Au layers, so as to form the company that crystallization and freezing after crystallization, temperature drop realizes both pads
Connect.
Embodiment 2：
On the basis of the embodiment of the present invention is based on a kind of high speed PAM4 optical transceiver modules based on DML described in embodiment 1, also
There is provided a kind of high speed PAM4 optical transceiver modules based on DML for possessing close beta function.As shown in fig. 7,
Light receiving unit 14 receives the optical signal for the 25Gbaud speed that outside optical-fiber network is sent, by opto-electronic conversion, linearly
Across resistance enhanced processing output difference 50Gbps PAM4 electric signals to the line side receiving terminal of PAM system conversion unit 12.PAM standards
The electric signal received is looped back to line side transmitting terminal and is sent to DML Optical Transmit Units 13 by converting unit.The transmitting of DML light is single
The 25G Linear actuators of member 13 receive 50Gbps PAM4 voltage signals and are converted to current signal driving 25G directly modulated lasers
DML, the optical signal of directly modulated lasers transmitting 25Gbaud speed is to outside optical-fiber network.
Wherein, between the CAUI receiving units of PAM4 standards coding unit and PAM4 standard decoding unit CAUI transmitter units
Foundation has on-off circuit, when DML high speed PAM4 optical transceiver modules enter the close beta, then controls PAM4 standards coding
On-off circuit closure between the CAUI receiving units and PAM4 standard decoding unit CAUI transmitter units of unit so that PAM4 systems
The electric signal of formula decoding unit CAUI transmitter units transmitting directly can be connect by the CAUI receiving units of PAM4 standard coding units
Receive；And when when DML high speed PAM4 optical transceiver modules are in normal mode of operation, then the CAUI of PAM4 standards coding unit
On-off circuit between receiving unit and PAM4 standard decoding unit CAUI transmitter units will be disconnected.
Embodiment 3：
On the basis of the embodiment of the present invention is based on a kind of high speed PAM4 optical transceiver modules based on DML described in embodiment 1, also
There is provided a kind of high speed PAM4 optical transceiver modules based on DML for possessing loopback test function.As shown in figure 8,
PAM4 system conversion unit 12 also includes 50Gbps PAM4 pattern generators and 50Gbps PAM4 error code testing lists
Member.PAM4 pattern generators send 50Gbps PAM4 electric signals to DML Optical Transmit Units 13, inside DML Optical Transmit Units 13
25G Linear actuators receive the voltage signal and are converted to current signal driving 25G directly modulated lasers DML.DML lasers 132
The optical signal of transmitting 25Gbaud speed is by fiber optic loop back to light receiving unit 14.Photodetection inside light receiving unit 14
Chip 142 converts optical signals to current signal, and current signal is then converted into differential voltage by linear trans-impedance amplifier 141
Signal.PAM4 error code testings unit receives the differential voltage signal of the output of light receiving unit 14 and tests its bit error rate, final real
Existing inside modules loopback test function.
Embodiment 4：
The embodiment of the present invention additionally provides a kind of high speed PAM4 optical transceiver modules based on DML, as shown in Figure 9.Including：Connect
Mouth unit 11, transmitter unit 13, linear receiving unit 13.1 road 50Gbps PAM4 electric signals are directly sent to by interface unit 11
Transmitter unit 13, transmitter unit is integrated with 25G Linear actuators and 25G directly modulated lasers DML, and Linear actuator receives 50Gbps
Voltage signal and be converted into driving current driving DML, optical signal is finally sent by DML.Conversely, linear receiving unit 14
The optical signal that outside optical-fiber network is sent is received, current signal is first converted optical signals to by high-speed photodetector 142, then line
Current signal is converted to 50Gbps PAM electric signals and exported via interface unit 11 by property trans-impedance amplifier 141.
What deserves to be explained is, in information exchange, implementation procedure between module, unit in said apparatus and system etc.
Hold, due to being based on same design with the processing method embodiment of the present invention, particular content can be found in the inventive method embodiment
Narration, here is omitted.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of embodiment is to lead to
Cross program to instruct the hardware of correlation to complete, the program can be stored in a computer-readable recording medium, storage medium
It can include：Read-only storage (ROM, Read Only Memory), random access memory (RAM, Random Access
Memory), disk or CD etc..
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of high speed PAM4 optical transceiver modules based on DML, it is characterised in that optical transceiver module includes interface unit, PAM4
System conversion unit, DML Optical Transmit Units and light receiving unit：
The interface unit connects PAM4 system conversion units, for passing through first yard that the interface unit is passed over
The NRZ electric signals of rate give the PAM4 system conversion unit；
The PAM4 system conversion unit is also connected with DML Optical Transmit Units and light receiving unit, for by first code check
NRZ electric signals are converted into the electric signal of the first PAM4 modulation format forms, and hand to the DML Optical Transmit Units, with toilet
State DML Optical Transmit Units and the PAM4 encoded signals are launched with laser signal；Wherein, the first PAM4 modulation format forms
The code check of electric signal is the first code check；
The PAM4 system conversion unit is additionally operable to receive the telecommunications of the 2nd PAM4 modulation format forms of light receiving unit generation
Number, and the electric signal of the 2nd PAM4 modulation format forms is converted into after the second nrz encoding electric signal, pass to described connect
Mouth unit；Wherein, the code check of the second nrz encoding electric signal is the first code check.
2. optical transceiver module according to claim 1, it is characterised in that the PAM4 system conversion unit includes PAM4 systems
Formula coding unit and PAM4 standard decoding units, the interface unit include main frame receiving port and host sending end mouthful,
PAM4 standards coding unit connects the main frame receiving port, for obtaining received by the main frame receiving port two
The NRZ electric signals of the code check of road first, and be converted to the electric signal of the first PAM4 modulation format forms all the way, the transmission by line side
Port is exported；
PAM4 standards decoding unit is used for the 2nd PAM4 modulation format forms all the way for the receiving port reception for obtaining line side
Electric signal, and the NRZ electric signals of two-way the 2nd are decoded as, exported by host sending end mouthful.
3. optical transceiver module according to claim 2, it is characterised in that the PAM4 standards coding unit connects including CAUI
Receive unit, two clock data recovery circuits, 2:1 electric signal multiplexer, forward error correction coding unit and PAM4 encoders,
The CAUI receiving units obtain the NRZ electric signals of the code check of two-way first of main frame receiving port；Described two clock numbers
It is used for the recovery that clock data is carried out to the NRZ electric signals of first code check, first yard of the two-way after recovery according to restoring circuit
The NRZ electric signals of rate reach 2:1 electric signal multiplexer；2:1 electric signal multiplexer is used for the NRZ electricity of the code check of two-way first
Signal multiplexing is the NRZ electric signals of the second code check all the way, and the electric signal transmission code after multiplexing adds by forward error correction coding unit
Enter redundant correcting code, and be transmitted to PAM4 encoders；The PAM4 encoders are used to the NRZ electric signals of the second code check being converted to the
The electric signal of first PAM4 modulation format forms of one code check, and sent by line side sending port to DML Optical Transmit Units；Its
In, the speed of the second code check is twice of the first code check speed.
4. optical transceiver module according to claim 2, it is characterised in that the PAM4 standards decoding unit turns including modulus
Parallel operation, digital signal processing unit, 1:2 electric signal demultiplexers, decoding FEC unit and CAUI transmitter units,
AD conversion unit, for the line-side interface to be received into the second of the first code check all the way that light receiving unit is sent
The electric signal of PAM4 modulation format forms is converted to data signal；
The digital signal processing unit, the data signal for AD conversion unit to be obtained is converted to NRZ modulation lattice
The electric signal of second code check of formula；
Described 1:2 electric signal demultiplexers, the 2nd NRZ for the electric signal of the second code check to be demultiplexing as to 2 the first code checks of tunnel
Coded electrical signal, and error correction decoding processing is carried out by decoding FEC unit, it is sent to by host computer side CAUI transmitter units
Host sending end mouthful；
Wherein, the speed of the second code check is twice of the first code check speed.
5. optical transceiver module according to claim 1, it is characterised in that the DML Optical Transmit Units drive including linear DML
Dynamic device and DML lasers；
DML Linear actuators receive the differential voltage signal of PAM4 standard coding unit circuits side ports transmission and are converted to electric current
Drive signal drive DML lasers, laser by module optical interface launch the first code check optical signal to outside optical-fiber network；Its
In, the differential voltage signal corresponds to the electric signal of the first PAM4 modulation format forms.
6. optical transceiver module according to claim 5, it is characterised in that the DML Linear actuators and DML lasers profit
It is fixed on golden tin solder in ceramic cartridge, ceramic cartridge is inside and outside one layer of golden finger respectively, and two layers of golden finger is by height
Frequency transmission line is connected, and outside golden finger is directly connected to realize power supply, monitoring by way of thermocompression bonding with module pcb board golden finger
And electric signal transmission；Internal golden finger realizes and is electrically connected that DML is linear by way of gold thread bonding with DML Linear actuators
Driver is connected by way of gold thread bonding with DML lasers.
7. optical transceiver module according to claim 1, it is characterised in that the light receiving unit includes linear across resistance amplification
Device and photodetector,
The photodetector is used to receive the optical signal for the first code check that outside optical-fiber network is sent and is converted to current signal biography
Give linear trans-impedance amplifier；The linear trans-impedance amplifier is sent to for current signal to be converted into differential voltage signal
The line-side interface of PAM4 standard decoding units；Wherein, the differential voltage signal correspondence and the 2nd PAM4 modulation formats
The electric signal of form.
8. optical transceiver module according to claim 7, it is characterised in that the linear trans-impedance amplifier passes through conductive silver glue
It is fixed in ceramic cartridge；The photodetector electrode is directly connected using face-down bonding mode with linear trans-impedance amplifier electrode
Connect；It is attached between golden finger inside linear trans-impedance amplifier and ceramic cartridge by way of gold thread bonding；Photoelectricity is visited
Survey device and send the current signal after opto-electronic conversion to trans-impedance amplifier, the high-frequency electrical that trans-impedance amplifier is produced via bonding gold thread
Pressure signal sends golden finger inside shell to via bonding gold thread, and high-frequency signal is transmitted via high frequency transmission line from internal golden finger
To outside golden finger.
9. optical transceiver module according to claim 1, it is characterised in that golden finger then passes through thermocompression bonding outside ceramic cartridge
Mode and module pcb board golden finger be directly connected to realize power supply, monitoring and high frequency signal transmission.
10. optical transceiver module according to claim 7, it is characterised in that the photodetector pad structure can be GS
Or GSG structures, corresponding trans-impedance amplifier radio frequency input pad structure is also GS the or GSG structures of correspondingly-sized.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710133814.6A CN107124225A (en) | 2017-03-08 | 2017-03-08 | A kind of high speed PAM4 optical transceiver modules based on DML |
| PCT/CN2017/080288 WO2018161405A1 (en) | 2017-03-08 | 2017-04-12 | Dml-based high-speed pam4 optical transceiver module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710133814.6A CN107124225A (en) | 2017-03-08 | 2017-03-08 | A kind of high speed PAM4 optical transceiver modules based on DML |
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| CN107124225A true CN107124225A (en) | 2017-09-01 |
Family
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|---|---|---|---|
| CN201710133814.6A Pending CN107124225A (en) | 2017-03-08 | 2017-03-08 | A kind of high speed PAM4 optical transceiver modules based on DML |
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| CN (1) | CN107124225A (en) |
| WO (1) | WO2018161405A1 (en) |
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| CN108259084A (en) * | 2017-12-26 | 2018-07-06 | 武汉电信器件有限公司 | A kind of assessment harden structure of high-speed light receiver test and its test system |
| CN108306685A (en) * | 2018-01-11 | 2018-07-20 | 青岛海信宽带多媒体技术有限公司 | Optical module and TWDM passive optical network |
| CN109547114A (en) * | 2017-09-22 | 2019-03-29 | 深圳市欧凌克光电科技有限公司 | A kind of SFP encapsulation 100G opto-electronic receiver module |
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| WO2021115454A1 (en) * | 2019-12-13 | 2021-06-17 | 华为技术有限公司 | Optical-to-electrical signal converter, optical drive processing and receiving module, and network interaction device |
| CN113346955A (en) * | 2021-08-05 | 2021-09-03 | 深圳市迅特通信技术股份有限公司 | ONU module used in passive optical network above 50G |
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