EP1751614A2 - Circuit de commande pour modulateur d'electro-absorption - Google Patents
Circuit de commande pour modulateur d'electro-absorptionInfo
- Publication number
- EP1751614A2 EP1751614A2 EP05741247A EP05741247A EP1751614A2 EP 1751614 A2 EP1751614 A2 EP 1751614A2 EP 05741247 A EP05741247 A EP 05741247A EP 05741247 A EP05741247 A EP 05741247A EP 1751614 A2 EP1751614 A2 EP 1751614A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- driving circuit
- absorption modulator
- electro absorption
- ghz
- filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0121—Operation of devices; Circuit arrangements, not otherwise provided for in this subclass
Definitions
- the present invention relates to a driving circuit for driving of an electro absorption modulator as defined in claim 1, and a use of a driving circuit as defined in claim 10.
- An electro absorption modulator uses electro absorption in a semiconductor to modulate an optical signal.
- a common application is for generation of an optical signal for fiber optic transmission.
- a continuous wave (CW) laser is used to generate light and the EA-modulator is used for adding a high speed modulation on the output from the laser.
- Very common is to integrate both the laser and the modulator on the same substrate.
- the laser is single frequency laser (DFB or DBR) .
- the EA modulator commonly used for long distance transmission (>40 km) at high speed over single mode fiber.
- the purpose of the invention is to provide a better optical output signal from an electro absorption modulator compared to the above mentioned prior art devices.
- This purpose is achieved by providing a driving signal as defined in the characterizing portion of claim 1.
- An advantage with the present invention is that better characteristics are obtained.
- Figure 1 shows an example of waveform degradation with increasing power according to prior art.
- Figure 2 shows an example of compensating electrical network.
- Figure 3 shows a combination of compensating network and peaking network.
- Figure 4 shows an example of improvement from compensating network as measured on real device.
- Figure 5 shows an example with no compensating network.
- Figure 6 shows the same device as in figure 5 with compensating network. Notice the reduced noise on the one level and the larger margin to the central mask.
- Figure 7 shows two oscilloscope pictures of eight consecutive one followed by eight consecutives zeros. To the left is a transmitter without compensating network and to the right the compensating network has been added.
- Figure 8 is an example of electrical implementation of the invention.
- Figure 9 is a typical transfer function of the block diagram shown in figure 2.
- Figure 10 is a transfer function of the block diagram shown in figure 3.
- Figure 1 shows the optical power output from an EA-modulator as a function of time.
- the pulse period is 1.8 ns .
- the input power is increases in the order of curve 1, 2, 3 and 4.
- the observed behavior of the EA is nonlinear. However it can be well modulated by a linear first order low pass filter. It is thus possible to rather well compensate it by using an electrical filter.
- the transmitter performance can be further enhanced by also adding a high frequency peaking.
- a suitable cut-off is around 3 GHz.
- An example of this is shown in Figure 3.
- the peaking is prior-art but it is extra advantageous in combination with the compensating network.
- a comparison for a real device with and without a compensating network is shown in Figure 4.
- a real device have first been measured without compensating network and the sensitivity have been measured after 0 km of fiber and 90 km of fiber (represented by lines with open squares) . After the compensating network has been added the device was measured again. As one can see the power needed to obtain transmission was reduced by several dB.
- the mask margin is improved with the compensating network.
- the improvement on a module where the compensating network was added can be seen when Figure 5 and Figure 6 are compared.
- the invention is to use a compensating electrical filter in the driving circuit to an electro absorption modulator.
- the driving circuit could be represented by a high pass filter with a zero in the range of 0.3 - 1.2 GHz, preferably around 0.6 GHz and a pole at a 10 - 50% higher frequency, preferably around 20%, and should be designed to compensate for the pattern dependence seen in the specific EA-modulator.
- the pole should be 0.72 GHz when the preferred value of 20% higher frequency is selected.
- the inventive driving circuit is preferably used for applications where the modulation frequency is higher than 8 GHz.
- the compensating network can also be added before a linear amplifier or integrated in the DFB-EA itself or on its sub carrier .
- Figure 8 is an example of an electrical implementation of the invention.
- a standard circuit consists of a driver circuit with 50 ohm output impedance electro absorption modulator (denominated EAM in the figure) works as a reverse bias diode and has a matching resistor in parallel.
- the invention is implemented as an inductor L2 and a resistor R2.
- a typical value for R2 is 200 ohms and for L2 is 30 nH.
- the invention may naturally be implemented in a different way, as is obvious for a skilled person in the arts, for example the filter may be implemented using a capacitor in parallel with a resistor, where the filter is connected in series between the driver and the EA modulator.
- An optional second high frequency network can be implemented using Rl and LI where LI should be around 7 nH and R is also 200 ohm.
- the optional second high frequency network could be represented by a high pass filter with a zero in the range of 1.5 - 8 GHz, preferably around 2.4 GHz and a pole at a 10 - 50% higher frequency, preferably around 20%
- the pole should be 2.88 GHz when the preferred value of 20% higher frequency is selected.
- Figure 9 shows a typical transfer function of the shown block diagram in figure 2.
- the transfer function in figure 9 can be written as:
- Figure 10 shows the transfer function of the shown block diagram in figure 3.
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Semiconductor Lasers (AREA)
Abstract
Cette invention concerne un circuit de commande ainsi que l'utilisation d'un circuit de commande, pour la commande d'un modulateur d'électro-absorption. Ce circuit de commande comprend un circuit électrique de renforcement haute fréquence, qui compense le renforcement basse fréquence du modulateur d'électro-absorption. Le circuit électrique de renforcement haute fréquence comprend au moins un premier filtre ayant un zéro dans la plage comprise entre 0,3 et 1,2 GHz et un pôle à une fréquence supérieure de 10 à 50%.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0401235A SE528443C2 (sv) | 2004-05-13 | 2004-05-13 | Drivkrets för elektroabsorptionsmodulator |
PCT/SE2005/000688 WO2005110004A2 (fr) | 2004-05-13 | 2005-05-13 | Circuit de commande pour modulateur d'electro-absorption |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1751614A2 true EP1751614A2 (fr) | 2007-02-14 |
Family
ID=32390936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05741247A Withdrawn EP1751614A2 (fr) | 2004-05-13 | 2005-05-13 | Circuit de commande pour modulateur d'electro-absorption |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1751614A2 (fr) |
CN (1) | CN1981234A (fr) |
SE (1) | SE528443C2 (fr) |
WO (1) | WO2005110004A2 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101702489B (zh) * | 2009-11-05 | 2011-12-28 | 中兴通讯股份有限公司 | 一种电吸收调制激光器的偏置电路及其调试方法 |
US8896352B2 (en) * | 2011-10-21 | 2014-11-25 | Taiwan Semiconductor Manufacturing Company, Ltd. | Drivers having T-coil structures |
CN102820918B (zh) * | 2012-08-13 | 2015-09-02 | 苏州海光芯创光电科技有限公司 | 具有高频预补偿的集成化光芯片及高速光通信器件 |
CN103399418B (zh) * | 2013-07-23 | 2016-01-20 | 清华大学 | 补偿电吸收调制器非线性的方法及装置 |
CN103457154B (zh) * | 2013-08-29 | 2015-10-28 | 烽火通信科技股份有限公司 | 带预加重的集成光通信激光驱动器 |
CN109495185B (zh) * | 2018-11-14 | 2020-12-22 | 青岛海信宽带多媒体技术有限公司 | 光模块 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1324102A2 (fr) * | 2001-12-13 | 2003-07-02 | Nec Corporation | Système de modulation optique pour appliquer un procédé d'asservissement de la tension de polarisation hautement stabilisé pour un modulateur optique |
-
2004
- 2004-05-13 SE SE0401235A patent/SE528443C2/sv not_active IP Right Cessation
-
2005
- 2005-05-13 CN CNA200580019403XA patent/CN1981234A/zh active Pending
- 2005-05-13 WO PCT/SE2005/000688 patent/WO2005110004A2/fr active Application Filing
- 2005-05-13 EP EP05741247A patent/EP1751614A2/fr not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1324102A2 (fr) * | 2001-12-13 | 2003-07-02 | Nec Corporation | Système de modulation optique pour appliquer un procédé d'asservissement de la tension de polarisation hautement stabilisé pour un modulateur optique |
Also Published As
Publication number | Publication date |
---|---|
WO2005110004A3 (fr) | 2006-04-27 |
SE0401235L (sv) | 2005-12-28 |
SE528443C2 (sv) | 2006-11-14 |
WO2005110004A2 (fr) | 2005-11-24 |
SE0401235D0 (sv) | 2004-05-13 |
CN1981234A (zh) | 2007-06-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20061204 |
|
AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
17Q | First examination report despatched |
Effective date: 20071218 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20101217 |