CN104682191B - The driving method and laser drive circuit of laser in a kind of optical module - Google Patents
The driving method and laser drive circuit of laser in a kind of optical module Download PDFInfo
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- CN104682191B CN104682191B CN201510133626.4A CN201510133626A CN104682191B CN 104682191 B CN104682191 B CN 104682191B CN 201510133626 A CN201510133626 A CN 201510133626A CN 104682191 B CN104682191 B CN 104682191B
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Abstract
The invention discloses the driving method and laser drive circuit of laser in a kind of optical module, control information is stored using register, control the working status of laser driver, by adding open loop situations before laser driver enters automated closed-loop power control status, so that laser driver can quickly export predetermined current value in initial procedure is powered on, shorten the output stabilization time of optical module under automated closed-loop power control status, efficiently solve and power on overshoot phenomenon, the stability for having reached module when powering on improves, the service life of optical module inner light device part increases and meets the effect of module initialization time.
Description
Technical field
The present invention relates to driving method and the Laser Driven electricity of laser in optical communication field, more particularly to a kind of optical module
Road.
Background technology
Optical communication network is increasing to the demand of intelligent high-speed optical module, and the critical piece of optical module is light emitting mould
Block, there is laser diode (LD-Laser diode) small, light-weight, low-power to drive, Output optical power is big, modulation methods
Just, long lifespan and the series of advantages such as it is easily integrated and becomes common light emitting devices, but laser diode is an electric current device
Part, is only exceeding threshold current I by its forward currentthJust when shine, in order to it is played the role of high-speed switch, it is necessary to
It is added and is slightly larger than threshold current IthDC bias current IBLAS.As shown in Figure 1, as the rising of temperature is, it is necessary to increase
DC bias current IBLASWith modulation electric current IMOD, in the prior art, laser driving circuit is to pass through automated power control
(APC) come to adjust I according to the threshold current of laser diodeBLASSize to keep average light power PAVGIt is constant.
But inside traditional optical module in power up, laser driver controls laser driver by internal register
Output current, for DC bias current IBLASControl, be directly by automated power control carry out current compensation, but
The parameters of optical module are also in initial phase at this time, due to the electric current and target current of internal drive laser at this time
(according to the required laser diode current of luminous power) difference is larger, it is necessary to larger bias current IBLAS, according to APC's
Operation principle, can make laser drive current regulated quantity too big under closed loop adjustment state at this time, and cause the shakiness that shines, and often occur
Overshoot phenomenon.Causing module to power on, electric current is larger, and transmitting light is stronger, overshoots eye pattern, it is impossible to meets that initialization time requires.Shadow
The service life of the stability of module, the service life of optical device and module when powering on is rung, can not meet the time of initialization
It is required that.
The content of the invention
In view of this, in order to solve the problems, such as that optical module powers on overshoot, the present invention provides laser in a kind of optical module
Driving method, the stability of module improves when being powered on reaching, the service life of optical module inner light device part increases and meets mould
The effect of initialization block time.
In order to solve the problems, such as that optical module powers on overshoot, the driving method of laser includes following in optical module of the invention
Step：
(1) register on laser driver chip is initialized, stores the first control information, first control information is used
In the working status for controlling the laser driver, the working status includes：Open loop situations and automated power control state, and
The open loop situations are arranged to original state；
(2) the predetermined output current value of laser driver is set according to the threshold current of laser and is stored in Laser Driven
In register on device chip, then start laser driver；
(3) laser starts to shine under the driving of the laser driver, treats the outputting current steadily of laser driver
In the predetermined output current, switch the control information so that the working status of the laser driver is changed into automated power
State of a control.
In order to shorten the stabilization time of automated power control state, automated power control state is divided into by register：
High-Speed Automatic power control status and normal speed automated power control state, wherein, the control of storage second is further included in step (1)
Information processed, second control information are used to control the automated power control shape in the automated power control state of laser driver
State and normal speed automated power control state, the electric current adjustment frequency of laser driver under the High-Speed Automatic power control status
Rate is more than the electric current adjustment frequency of laser driver under the normal speed automated power control state.
The driving method of laser is further comprising the steps of in the optical module of the present invention：
The working status of the laser driver is arranged to High-Speed Automatic by the second control information stored using register
Power control status；
After closed-loop stabilization, the working status of the laser driver is arranged to normal automated power control shape
State.
The invention also discloses a kind of optical mode laser drive circuit in the block, including：Laser works circuit and automatic work(
Rate control circuit, the laser works circuit are connected with the automatic power control circuit by switching device.
Wherein, the switching device is ambipolar HF power transistor, thyristor circuit or field-effect tube.
Compared with the prior art, optical module powering method of the invention includes advantages below：
The present invention can make 10Gbits optical modules complete the initialization procedure of module within the very short time, provide
300 milliseconds of initialization times in can work normally, occur without electric light eye pattern overshoot phenomenon, be previously required to about 500
Millisecond ability steady operation, protects the safety of optical device and driving chip, increases the use of the service life and module of optical device
In the service life, ensure that network normally communicates.
Brief description of the drawings
Fig. 1 is laser input-output characteristic schematic diagram；
Fig. 2 is the drive circuit schematic diagram of laser driver in optical module of the present invention；
Fig. 3 is the driving method flow chart of laser in optical module of the present invention.
Embodiment
The present invention is further described with reference to embodiment.
It is LD operating circuits on the left of circuit in Fig. 2, right side is APC loops, and APC loops pass through switching device in the present invention
It is attached with left side circuit, on the left of switch connection during circuit, belongs to closed loop states, APC loop works, transmit from LD rear ends
Light out is detected by a photoelectric monitoring diode PD, then the luminous power detected is converted to back facet current IPIN,
IPINIt is added in integrated transporting discharging filter and amplification input terminal generation one and is proportional to LD average light powers PAVGMean direct voltage, this
Voltage and reference voltage VREFCompare, then amplify by trsanscondutance amplifier, output is used for controlling the feedback biasing electric current of LD
IBIASFBForm negative feedback loop.When LD Output optical power reduces, the output current I of PDPINReduce, trsanscondutance amplifier output current
IBIASFBForward direction outflow, is superimposed upon DC bias current IBLASOn, make the bias current of LD increase, vice versa, and such LD's is flat
Equal luminous power PAVGJust remain constant.When switching device is grounded, belong to open loop situations, at this time, APC does not work LD electric
Road provides feedback biasing electric current IBIASFB, laser driver, which provides LD, stablizes constant DC bias current IBLAS.In Fig. 2
Switching device can be ambipolar HF power transistor, thyristor circuit and field-effect tube, by laser driver core
The register of on piece is controlled.
As shown in figure 3, the driving method of the laser driver of the present invention comprises the following steps：Initialization register, is set
The value of the register of laser driving chip, two storage address of mask register carry out memory driver working state control letter
Breath, the first storage address represent the open loop situations and closed loop automated power control (APC) state of laser with " 0 ", " 1 " respectively,
And initial value is arranged to " 0 "；Second storage address " 0 ", " 1 " represent the high-speed closed loop automatic loop control shape of laser respectively
State and normal speed closed loop automatic loop control state；The initial value of two storage control information is set to " 0 ", makes to power on
Afterwards, the work of laser driving chip enters open loop situations, i.e. output parameter does not feed back to input terminal and participates in output current value (partially
Put electric current IBLAS) adjusting, then given expected current values and other background register initial values, by laser driver (LD)
Output current be transferred to specified current flow, open laser driver at this time, laser driver needs certain time to stablize output,
Be not in that overshoot is existing under open loop situations since default electric current is configured according to the threshold current of laser
As；Wait module under opened loop control state after working stability, i.e. when the output current of laser driver has arrived at preset value,
At this time, the driving current of laser and expected operating current difference are smaller, and regulated quantity is little, so curent change will not
Too big, output light would not also overshoot, then that by register the work of laser driving chip is arranged to high-speed closed loop is automatic
Loop state of a control, at this time bias current IBLASChange is little, therefore required feedback biasing electric current IBIASFBAlso can expire quickly
Foot, can make APC loop to rapidly enter stable state under this state, shorten APC loop settling times, but the laser sent is also
It is not sufficiently stable；When laser driving chip is arranged to again after the loop stability under high-speed closed loop automatic loop control state
Normal speed closed loop automatic loop control state is run, and reduces the change speed of loop current, and the laser for making to send is stablized.So
Stable APC loops can be established within the time as defined in standard, export stable light.
The preferred embodiment of the present invention described in detail above, still, during present invention is not limited to the embodiments described above
Detail, in the range of the technology design of the present invention, a variety of equivalents can be carried out to technical scheme, this
A little equivalents belong to protection scope of the present invention.
Claims (2)
1. the driving method of laser in a kind of optical module, it is characterised in that comprise the following steps：
(1) register on laser driver chip is initialized, stores the first control information, first control information is used to control
The working status of the laser driver is made, the working status includes：Open loop situations and automated power control state, and by institute
State open loop situations and be arranged to original state；
(2) the predetermined output current value of laser driver is set according to the threshold current of laser and is stored in laser driver core
In the register of on piece, then start laser driver；
(3) laser starts to shine under the driving of the laser driver, treats the outputting current steadily of laser driver in institute
When stating predetermined output current, switch the control information so that the working status of the laser driver is changed into automated power control
State；
Automated power control state is divided into by register：High-Speed Automatic power control status and normal speed automated power control
State processed, wherein, the second control information of storage is further included in step (1), second control information is used to control Laser Driven
High-Speed Automatic power control status and normal speed automated power control state in the automated power control state of device, the height
The electric current adjustment frequency of laser driver is more than the normal speed automated power control state under fast automated power control state
The electric current adjustment frequency of lower laser driver；
It is further comprising the steps of：
The working status of the laser driver is arranged to High-Speed Automatic power by the second control information stored using register
State of a control；
After closed-loop stabilization, the working status of the laser driver is arranged to normal speed automated power control shape
State.
2. the driving method of laser in optical module according to claim 1, it is characterised in that first control information
For binary message, first control information is open loop situations when being " 0 "；First control information is automatic when being " 1 "
Power control status.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510133626.4A CN104682191B (en) | 2015-03-25 | 2015-03-25 | The driving method and laser drive circuit of laser in a kind of optical module |
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| CN201510133626.4A CN104682191B (en) | 2015-03-25 | 2015-03-25 | The driving method and laser drive circuit of laser in a kind of optical module |
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| CN104682191B true CN104682191B (en) | 2018-05-04 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020133144A1 (en) * | 2018-12-28 | 2020-07-02 | 深圳市傲科光电子有限公司 | Directly modulated laser drive circuit and directly modulated laser system |
| CN111327368A (en) * | 2020-02-27 | 2020-06-23 | 长飞光纤光缆股份有限公司 | Control method and device for realizing rapid APC (automatic Power control) of optical module |
| CN111600196B (en) * | 2020-05-22 | 2023-04-25 | 索尔思光电（成都）有限公司 | Multichannel low-power-consumption APC control circuit and method for forward voltage of laser |
| CN113241586B (en) * | 2021-04-20 | 2022-07-29 | 航天恒星科技有限公司 | Output stable optical power control method for spacecraft optical transceiver module |
| CN116388866B (en) * | 2023-06-05 | 2023-09-01 | 绍兴中科通信设备有限公司 | Device and method for adjusting optical power of device on optical module |
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| US7174099B1 (en) * | 2002-01-23 | 2007-02-06 | Network Appliance, Inc. | System for regulating optical output power |
| CN101218720A (en) * | 2005-07-11 | 2008-07-09 | 松下电器产业株式会社 | Light source, light source device, laser image forming device and integrated circuit |
| CN102761053A (en) * | 2011-04-26 | 2012-10-31 | 厦门优迅高速芯片有限公司 | Automatic power control method and device of laser |
| CN103809645A (en) * | 2014-03-05 | 2014-05-21 | 电子科技大学 | Starting circuit for wide power band gap reference source |
| CN104362504A (en) * | 2014-11-11 | 2015-02-18 | 索尔思光电（成都）有限公司 | Light overshoot control circuit and light overshoot control method |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7174099B1 (en) * | 2002-01-23 | 2007-02-06 | Network Appliance, Inc. | System for regulating optical output power |
| CN101218720A (en) * | 2005-07-11 | 2008-07-09 | 松下电器产业株式会社 | Light source, light source device, laser image forming device and integrated circuit |
| CN102761053A (en) * | 2011-04-26 | 2012-10-31 | 厦门优迅高速芯片有限公司 | Automatic power control method and device of laser |
| CN103809645A (en) * | 2014-03-05 | 2014-05-21 | 电子科技大学 | Starting circuit for wide power band gap reference source |
| CN104362504A (en) * | 2014-11-11 | 2015-02-18 | 索尔思光电（成都）有限公司 | Light overshoot control circuit and light overshoot control method |
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