WO2003081811A1 - Procede de transposition de signal tout optique par transmodulation de gain dans un amplificateur optique a semiconducteur, et appareil correspondant - Google Patents

Procede de transposition de signal tout optique par transmodulation de gain dans un amplificateur optique a semiconducteur, et appareil correspondant Download PDF

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Publication number
WO2003081811A1
WO2003081811A1 PCT/KR2003/000519 KR0300519W WO03081811A1 WO 2003081811 A1 WO2003081811 A1 WO 2003081811A1 KR 0300519 W KR0300519 W KR 0300519W WO 03081811 A1 WO03081811 A1 WO 03081811A1
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WO
WIPO (PCT)
Prior art keywords
signal
optical amplifier
semiconductor optical
frequency
data signal
Prior art date
Application number
PCT/KR2003/000519
Other languages
English (en)
Inventor
Woo-Young Choi
Young-Kwang Seo
Chang-Soon Choi
Original Assignee
Yonsei University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yonsei University filed Critical Yonsei University
Priority to AU2003215937A priority Critical patent/AU2003215937A1/en
Publication of WO2003081811A1 publication Critical patent/WO2003081811A1/fr

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Classifications

    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2914—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using lumped semiconductor optical amplifiers [SOA]
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • 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
    • G02F2/00—Demodulating light; Transferring the modulation of modulated light; Frequency-changing of light
    • G02F2/004—Transferring the modulation of modulated light, i.e. transferring the information from one optical carrier of a first wavelength to a second optical carrier of a second wavelength, e.g. all-optical wavelength converter
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/50—Amplifier structures not provided for in groups H01S5/02 - H01S5/30
    • H01S5/509—Wavelength converting amplifier, e.g. signal gating with a second beam using gain saturation

Definitions

  • the present invention relates to a method and apparatus for up- conversion of an all-optical signal through Cross-Gain Modulation (hereinafter referred to as an "XGM”) in a Semiconductor Optical Amplifier (hereinafter referred to as a "SOA").
  • XGM Cross-Gain Modulation
  • SOA Semiconductor Optical Amplifier
  • a Radio-on-Fiber hereinafter referred to as an
  • RoF Radio Frequency Division Multiplexing
  • Fig. 2 illustrates an example of the WDM technology.
  • a millimeter wave signal distribution technology through which a plurality of WDM signals having different wavelengths are simultaneously up- converted to a millimeter frequency band using a single Mach-Zenhder Modulator (hereinafter referred to as an "MZM") and then are transmitted through optical fibers, in a "R. A. Griffin et al. , Crosstalk Reduction in an Optical mm-Wave/DWDM Overlay for Radio-Over-Fibre Distribution, in Tech. Dig. MWP99. pp.131-134, 1999".
  • MZM Mach-Zenhder Modulator
  • operation properties of the modulator are different depending upon the wavelengths and polarizations of signals applied to the modulator.
  • the modulator has insertion loss equal to or greater than about 5 dB.
  • the modulator has a limited modulation frequency bandwidth, so that it is limited to a narrow frequency band in which the signal up-conversion is possible.
  • an optoelectronic mixing technique in which an Intermediate Frequency (hereinafter referred to as an "IF") data signal photo-detected is mixed in each of BSs using an electrical Local Oscillator (hereinafter referred to as a "LO") signal.
  • the method uses non-linearity of a three-terminal element, such as a High Electron Mobility Transistor (HEMT) or a HeteroBipolar Transistor (HBT).
  • HEMT High Electron Mobility Transistor
  • HBT HeteroBipolar Transistor
  • the method requires an LO signal source having a high frequency band in each of the BSs, so that the method has a problem that the design of the BSs is complicated.
  • an all-optical method which is capable of signal up-converting a baseband signal, an IF data signal or an LO signal using optically different wavelengths, becomes the object of interest.
  • an all-optical method which is capable of signal up-converting an IF data signal to a millimeter wave frequency band using nonlinear photo-detection properties of a high speed Photo-Detector (hereinafter referred to as a "PD"), in M. Tsuchiya, et al, Nonlinear Photodetection Scheme and Its system
  • an optical heterodyne technique such as an optical PLL and an injection locking, which generates a high frequency LO signal using an electrical oscillator generating a relatively low frequency. Accordingly, an all-optical approach has an advantage that it does not need a high speed electrical oscillator and a high speed optical modulator to generate a high frequency LO signal. Additionally, an optical LO signal is generated from a CO and transmitted to each of BSs, so that the problem raised in the optoelectronic mixing technique due to the need for the electrical LO signal source in each of the
  • an accessible signal up-conversion frequency band is restricted by the bandwidth of a PD, which is much broader than that of the optical modulator.
  • the method of using the non-linearity of the PD has a problem that a signal conversion efficiency is relatively low.
  • the present invention has been devised to overcome the problems of the methods for signal up-conversion for increasing the data transmission capacity of the conventional RoF system.
  • the object of the present invention is to provide a method and apparatus for up-conversion of an all-optical signal through an XGM in an
  • the present invention provides a method for up-conversion of an all-optical signal through Cross-Gain Modulation in a semiconductor optical amplifier, comprising: the first step of generating an IF data signal having a working frequency in a range of a frequency modulation bandwidth of the semiconductor optical amplifier and allowing the IF data signal to be input to the semiconductor optical amplifier; the second step of generating an LO signal having a frequency higher than frequencies of the frequency modulation bandwidth of the semiconductor optical amplifier and allowing the LO signal to be input to the semiconductor optical amplifier; and the third step of cross-gain modulating the IF data signal and the LO signal having been input to the semiconductor optical amplifier.
  • the present invention provides an apparatus for up-conversion of an all-optical signal through Cross-Gain Modulation in a semiconductor optical amplifier, comprising: a means for generating an IF data signal; a means for generating an LO signal; and the semiconductor optical amplifier for receiving the IF data signal and the LO signal and cross-gain modulating them; wherein a frequency of the IF data signal is in a range of a frequency modulation bandwidth of the semiconductor optical amplifier, and a frequency of the LO signal is higher than frequencies of the frequency modulation bandwidth of the semiconductor optical amplifier.
  • the present invention described above provides a method and an apparatus for up-conversion of an all-optical signal through an XGM in an SOA. According to the present invention, the problems of wavelength and polarization dependency of an input light of the conventional optical modulator are not generated, optical losses are compensated for by an optical gain of the SOA and a signal conversion efficiency can be improved.
  • Fig. 4 is a conceptual view according to the present invention.
  • the signals are up- converted by an XGM effect of the SOA in an optical manner.
  • the optical IF signal and the optical LO signal having different wavelength pass through the SOA.
  • a characteristic feature of the present invention is that the working frequency f [F of the IF data signal is in a range of the frequency modulation bandwidth of the SOA, while the working frequency fLo of the LO signal is higher than the frequency modulation bandwidth of the SOA.
  • the optical IF data signal and the optical LO signal input to the SOA mutually experience the XGM effect in the SOA.
  • the IF data signal in the range of the frequency modulation bandwidth of the SOA modulates the LO signal having a different wavelength, so that an image of the IF data signal is reflected in the LO signal.
  • the LO signal modulates the IF data signal, so that an image of the LO signal may be reflected in the IF data signal.
  • the frequency band of the LO signal is out of the range of the frequency modulation bandwidth of the SOA, a limited modulation effect is achieved. Consequently, the IF data signal is reflected in the LO signal by the XGM effect in the SOA, is photo-detected in a PD, and is therefore up-converted in the frequency band of the LO signal.
  • Fig. 1 is a view showing a construction of an RoF system
  • Fig. 2 is an example in which a WDM technique is applied to a RoF technique as a prior art
  • Fig. 3 is a view illustrating a method of signal up-conversion using non- linearity of an optical detector as another prior art
  • Fig. 4 is a conceptual view according to the present invention.
  • Fig. 5 is a view showing a construction according to an embodiment of the present invention
  • Figs. 6a and 6b are views showing optical spectrums at the time before and after signals pass through an SOA, respectively;
  • Figs. 7a and 7b are views showing RF spectrums at the time before and after signals pass through the SOA.
  • FIG. 5 is a block diagram according to the embodiment for up-conversion of an all-optical signal using a polarization-insensitive SOA.
  • a MZM Double-Side Band Suppressed Optical Carrier (DSB-SC) technique is used to generate an optical LO signal having a frequency band equal to or higher than the modulation bandwidth of the SOA.
  • An IF signal is generated by directly modulating a signal of a Distributed FeedBack-Laser Diode (DFB-LD) to a signal of 1 GHz.
  • the IF data signal of 1 GHz and an LO signal of 25 GHz which have different wavelengths are added together by a fiber coupler 57, and then passes through the SOA 58.
  • DFB-LD Distributed FeedBack-Laser Diode
  • a peak optical power of the IF data signal is set to 0 dBm in a front end of the SOA 58 by a Variable Optical Attenuator (VOA) 52.
  • VOA Variable Optical Attenuator
  • the operation voltage of an MZM 54 is set to V ⁇ and the DSB-SC modulation technique is employed.
  • the LO signal of 25 GHz is obtained by irradiating a light generated by a Tunable Laser Source (TLS) 53 that is a light source which is capable of regulating a wavelength of a light, and of electrically modulating the light input to the MGM 54 to the LO signal of 25 GHz.
  • TLS Tunable Laser Source
  • the former frequency of 25 GHz is determined by a limited access frequency bandwidth of the MGM 54.
  • An Er- Doped Fiber Amplifier (EDFA) 55 is an optical amplifier using an Er-doped fiber.
  • a factor of limiting the access frequency band of the LO signal can be overcome by an optical heterodyne technique.
  • the optical heterodyne technique is used to obtain an optical signal having a desired frequency by simultaneously inputting two optical carriers having frequencies, whose difference falls under a desired millimeter wave frequency band, to the PD 59 and mixing the two optical carriers.
  • peak power of +/- 1 sidebands is regulated using an electrical modulation power, so that the peak power is increased by 9 dB or more, compared to optical carrier power.
  • the IF signal and the LO signal are input to the SOA 58 and then cross- modulated in the SOA 58.
  • the frequency modulation bandwidth of the SOA 58 used in the embodiment is about 3 GHz, and the LO signal of 25 GHz much higher than the frequency modulation bandwidth of the SOA 58 is used.
  • a PD 59 is a photo detector
  • an RF-SA 60 is a RF-spectrum analyzer.
  • Figs. 6a and 6b are views showing optical spectrums of the IF data signal and the LO signal at the time before and after they pass through the SOA 58, respectively.
  • the wavelengths of the IF signal and the LO signal are spaced apart by about 11 nm.
  • the peak power of +/- 1 sidebands is greater than the optical carrier power in the optical spectrum of the LO signal (dotted line) at the time before the signal passes through the SOA 58 in Fig. 6a.
  • the two sidebands are spaced apart from each other by 25 GHz, which is twice the driving frequency of 12.5 GHz of the MZM 54.
  • each optical carrier power obtains optical gain of about 16dB while the LO and IF signals pass through the SOA 58.
  • the frequency of the IF signal is in the range of the frequency modulation bandwidth of the SOA 58, so that the IF signal is sufficiently up-converted.
  • the XGM effect of the +/- 1 sidebands cannot be directly confirmed by an optical spectrum due to the limit of the resolution of an optical spectrum analyzer.
  • Cross-gain modulated results are confirmed through an RF-spectrum analyzer after the signals are photo-detected as shown in Figs. 7a and 7b.
  • Fig. 7b it is confirmed that the IF signal (see Fig. 7a) is up-converted to Lower SideBand (LSB) of 24 GHz and Upper SideBand (USB) of 26 GHz after the IF signal at the time before it is up-converted passes through the SOA
  • each of the sizes of up-converted LSB and USB is greater than that of the IF signal at the time before up- conversion (see Fig. 7a) by about 10 dB.
  • the up-conversion method proposed in the present invention can be used in any LO frequency band and obtain the following effects according to the present invention.
  • a single LO signal can be used for up-conversion of a plurality of WDM signal sources, so that cost of generating the LO signal can be decreased.
  • the WDM technique is applied to the conventional RoF system, so that data transmission capacity can be maximized, and, additionally, a conventional WDM network can be maintained as it is.
  • the present invention can be applied to all services on the conventional network, so that the present invention allows flexible design of a network structure because another manipulation is not needed to generate only the structure of the present invention.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un procédé de transposition de signal tout optique par transmodulation de gain dans un amplificateur optique à semiconducteur, et un appareil correspondant. On commence par fournir un signal de données FI, utilisé dans une largeur de bande de modulation de fréquence d'amplificateur optique à semiconducteur, et ce signal est injecté dans l'amplificateur, puis on fournit un signal d'oscillateur local de fréquence supérieure à la largeur de bande susmentionnée, et ce signal est injecté dans l'amplificateur, et enfin ces deux signaux font l'objet d'une transmodulation de gain.
PCT/KR2003/000519 2002-03-25 2003-03-18 Procede de transposition de signal tout optique par transmodulation de gain dans un amplificateur optique a semiconducteur, et appareil correspondant WO2003081811A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003215937A AU2003215937A1 (en) 2002-03-25 2003-03-18 Method of up-conversion of all-optical signal through cross-gain modulation in semiconductor optical amplifier and apparatus thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2002-0015987 2002-03-25
KR1020020015987A KR20030077089A (ko) 2002-03-25 2002-03-25 반도체 광증폭기 크로스-게인 모듈레이션을 이용한 전광신호 업-컨버젼 방법 및 그 장치

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132510A1 (fr) * 2005-06-10 2006-12-14 Gwangju Institute Of Science And Technology Dispositif tout optique csma/cd base sur ethernet et procede associe
EP2403165A1 (fr) * 2010-07-02 2012-01-04 Alcatel Lucent Système de radiofréquence pour hétérodyne optique

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KR100800012B1 (ko) * 2006-05-03 2008-01-31 연세대학교 산학협력단 상호이득변조를 이용한 비선형 왜곡 제거장치 및 제거방법
KR100921861B1 (ko) * 2007-05-29 2009-10-13 광주과학기술원 광파이버 무선 시스템에서의 전광 주파수 상향 변환기 및전광 주파수 상향 변환 방법
KR100987793B1 (ko) * 2008-10-10 2010-10-13 한국전자통신연구원 반사형 반도체 광 증폭기 및 이를 이용하는 광신호 처리방법
KR101048879B1 (ko) * 2010-12-30 2011-07-13 주식회사 스마트비전 광섬유 기반 양방향 무선 전송 시스템에서 반도체 광증폭기를 이용하여 주파수를 변환하기 위한 장치 및 그 방법

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US6078417A (en) * 1997-05-29 2000-06-20 Lucent Technologies Inc. Spectral compaction via cross-modulation wavelength conversion
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KR100306707B1 (ko) * 1998-09-07 2003-01-24 한국전기통신공사 교차이득변조형반도체광파장변환기
KR100368793B1 (ko) * 2000-08-29 2003-01-24 한국과학기술연구원 전광 ｎｏｒ 논리소자 구현장치 및 그 방법

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006132510A1 (fr) * 2005-06-10 2006-12-14 Gwangju Institute Of Science And Technology Dispositif tout optique csma/cd base sur ethernet et procede associe
US8121476B2 (en) 2005-06-10 2012-02-21 Gwangju Institute Of Science And Technology All-optical CSMA/CD apparatus in base A ethernet and the method therefor
EP2403165A1 (fr) * 2010-07-02 2012-01-04 Alcatel Lucent Système de radiofréquence pour hétérodyne optique

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AU2003215937A1 (en) 2003-10-08
KR20030077089A (ko) 2003-10-01

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