WO2002045312A2 - Procede et dispositif pour la transmission de donnees par l'intermediaire de fibres optiques - Google Patents

Procede et dispositif pour la transmission de donnees par l'intermediaire de fibres optiques Download PDF

Info

Publication number
WO2002045312A2
WO2002045312A2 PCT/DE2001/004289 DE0104289W WO0245312A2 WO 2002045312 A2 WO2002045312 A2 WO 2002045312A2 DE 0104289 W DE0104289 W DE 0104289W WO 0245312 A2 WO0245312 A2 WO 0245312A2
Authority
WO
WIPO (PCT)
Prior art keywords
optical
data
time
code
lwl
Prior art date
Application number
PCT/DE2001/004289
Other languages
German (de)
English (en)
Other versions
WO2002045312A3 (fr
Inventor
Alexander Mircescu
Original Assignee
Siemens Aktiengesellschaft
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 Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2002045312A2 publication Critical patent/WO2002045312A2/fr
Publication of WO2002045312A3 publication Critical patent/WO2002045312A3/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/005—Optical Code Multiplex
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0305—WDM arrangements in end terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0077—Multicode, e.g. multiple codes assigned to one user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/005—Optical Code Multiplex
    • H04J14/007—Orthogonal Optical Code Multiplex

Definitions

  • the present invention relates to a method for data transmission via optical fibers, an optical transmission device for transmitting data via optical fibers and an optical receiving device for receiving data via optical fibers.
  • Optical fibers are particularly well suited for the transmission of large amounts of data with a high data transmission rate over long distances.
  • the possible data transmission rate depends on the transmission bandwidth of the transmission medium (optical fiber).
  • the usable wavelength range for optical data transmission via fiber is between 1.3 and 1.6 ⁇ of the optical carrier. This area results in a theoretical transmission bandwidth of 50 THz. So far, however, it has not been technically possible to fully utilize this theoretical range.
  • the data is transmitted using the so-called time division multiplex method (TDMA, Time Division Multiple Access).
  • TDMA Time Division Multiple Access
  • the time axis is continuously divided into sections (so-called frames) with a certain time duration T, the so-called frame duration.
  • Each of these frames consists of a certain number of time slots (ti ... t n) , each frame having the same number of time slots and the time slots being arranged without overlap.
  • the time slots in a frame are used from 1 to n meriert; the same time slots in the successive frames form a channel for data transmission.
  • the second transmission method for data transmission via optical fibers is the so-called frequency division multiplexing (FDMA, Frequency Division Multiple Access), also referred to as wavelength division multiplexing (WDM, Wavelength Division Multiplex) in optical communications technology.
  • FDMA Frequency Division Multiple Access
  • WDM Wavelength Division Multiplex
  • each channel occupies a certain narrow frequency band in an available frequency range.
  • the individual channels for data transmission are transmitted through different carrier frequencies in different frequency ranges. In optical communication, this means that different channels are transmitted with different wavelengths of light.
  • frequency or frequency division multiplex and “wavelength or wavelength division multiplex” can be used in an equivalent manner since the frequency and the wavelength are inversely proportional to one another.
  • the wavelength of the light with which the data is transmitted is usually specified.
  • the frequency is more suitable for displaying a (frequency) spectrum or its broadening and transmission bandwidth.
  • Wavelength division multiplex uses very fine-tunable laser diodes for transmission and corresponding photodiodes for Receiving the respective signals of the specific wavelength needed.
  • the data or data packets to be transmitted have to be reduced in time in order to increase the spectral utilization of the transmission bandwidth, so that with increasing spectral utilization, higher time requirements are placed on the signal-evaluating components, since the duration of the time slots cannot be made arbitrarily short.
  • the spectral utilization could also be increased in mobile, radio communication; this was implemented in the GSM system (Global System for Mobile Telecommunica- tion) of the mobile phones.
  • GSM Global System for Mobile Telecommunica- tion
  • the object of the present invention is therefore to provide a method and a device with which the spectral efficiency of the data transmission, ie the utilization to further improve the available transmission bandwidth of the optical waveguide.
  • This object is achieved by a method for transmitting data via optical fibers according to the appended claim 1. Furthermore, this object is achieved by an optical transmission and reception device and by an optical multi- and demultiplexer according to the appended claims 5, 8, 9 and 12.
  • a method for the transmission of data via optical fibers, which consists of a combination of time division multiplexing (TDMA) and code division multiplexing (CDMA) and is transmitted with a certain wavelength of light via an optical fiber.
  • TDMA time division multiplexing
  • CDMA code division multiplexing
  • the present invention provides an optical transmission device for transmitting data over optical fibers, the data in time and code division multiplexing over one
  • Optical fiber shipped In this case, the data from a number of channels for data transmission are converted into code functions by means of the code multiplex method by linking with a code for one channel in each case. In each case several of these code functions are inserted into a time slot by means of the time multiplex method, wherein several time slots result in a frame with a certain duration. These frames are now transmitted by an optical transmitter (e.g. laser diode) with a certain wavelength via an optical waveguide. That way, in everyone
  • Time slot to transmit data from multiple channels in the form of code functions
  • the present invention provides an optical multiplexer for data transmission via optical fibers.
  • This optical multiplexer consists of several of the described optical transmission devices, the optical transmitters each differentiate in the wavelength in which they emit the light. In this way, several frames can be transmitted simultaneously via one optical fiber using the frequency (or wavelength) multiplex method. Feeding several modulated carriers into a common one
  • Optical waveguide is made by an optical wavelength division multiplexer.
  • the combination of frequency, time and code division multiplex methods results in a three-dimensional medium access method for data transmission via an optical fiber.
  • the data is received in exactly the reverse order by an optical receiving device or an optical demultiplexer with the corresponding devices.
  • the advantage of the combination of the various multiplexing methods according to the invention is that a much better spectral efficiency of the glass fiber can be achieved with the available technical components than in the prior art, i.e. that the utilization of the theoretical transmission bandwidth of 50 THz on glass fibers for data transmission can be better exploited.
  • the present invention can be implemented relatively easily in existing systems since, compared to the prior art, the transmitting and receiving devices only have to be expanded by the code multiplexing and code demultiplexing devices. None changes in the optical components (e.g. laser transmitters, photodiodes, optical fibers).
  • the number of code functions that are transmitted per time slot depends on the number of channels for data transmission and the number of time slots per frame. With a number of * n channels for data transmission with the same distribution of the code functions, this results in a number of m code functions per time slot.
  • the individual time slots can each also transmit a different number of code functions.
  • the sum of the code functions that are transmitted per frame must then total m * n in order to be able to transmit the data of all channels.
  • the total number of k * m * n channels whose data can be transmitted over an optical fiber is obtained with a uniform distribution of the code functions over the time slots, which is an increase compared to the prior art means by a factor m.
  • Fig. 4 is a schematic representation of the optical data transmission system according to the invention.
  • each signal ie each carrier fi ... f k , occupies a narrow frequency band in the frequency space which is available overall for data transmission (transmission bandwidth ⁇ f).
  • the respective spectra (Gaussian signals), which result from the modulation of the respective carriers fi ... f with the data to be transmitted and which can be obtained by a Fourier transformation of the time function, are arranged in this frequency space without overlap, and each have a transmission bandwidth of ⁇ fi ... ⁇ fk
  • the receiver has optical receivers (photodiodes), which can each filter the corresponding frequency, or an optical demultiplexer, which assigns the individual frequencies fi ... f k to the corresponding receiver circuits in order to recover the transmitted data.
  • Fig. 2 shows the representation of the spectrum of a data transmission in time or code division multiplexing.
  • time-division multiplexing a carrier with a single frequency fi is used, in which the data of the individual transmission channels are transmitted successively in overlap-free time slots ti ... t n .
  • These time slots ti ... t n are arranged in a so-called frame, the duration of which results from the number of time slots and the respective duration of the individual time slots. After transferring the time slots ti ... tn starts transmission of time slots ti ... t n again.
  • the spectrum fi is broadened, which is determined by a Fourier transformation of time-limited signals, i.e. of the data to be transferred can be determined. Specifically, this means that, just like with frequency division multiplexing, an increase in the data rate of the data to be transmitted or the bandwidth of a signal to be transmitted results in a broadening of the spectrum.
  • time-division multiplex method it is also theoretically conceivable to achieve full utilization of the available bandwidth ⁇ f.
  • the duration of the time slots must be reduced, since a certain frame duration may not be exceeded for data or voice transmission in order to transmit the data or voice without errors or distortion.
  • This requirement entails a high requirement for the signal processing and evaluating components. For this reason, the full utilization of the available transmission bandwidth has not been possible until now using the time-division multiplex method for data transmission via optical fibers.
  • CDMA Code Division Multiple Access
  • This multiplex method is a transmission method in which several channels are transmitted at the same time with the same carrier frequency.
  • the (digital) data contained in the individual transmission channels are each linked to a different digital code, which has a significantly higher clock rate than the data to be transmitted.
  • the recipient is through the
  • Knowledge of the respective code for the corresponding channel for data transmission is able to decode the data of the corresponding channel and thus to obtain the corresponding information.
  • the time and frequency (or wavelength) multiplexing methods are combined to form a two-dimensional access method.
  • the combination of these two access methods is also known from radio technology.
  • TDMA time division multiplex method
  • the data from k * n transmission channels can be transmitted.
  • the known two-dimensional access method ie the combination of time and frequency division multiplex methods
  • the code division multiplex method is used for data transmission in optical fibers.
  • the data of several transmission channels are transmitted on each carrier frequency fi ... fk n every time slot t x ... t n .
  • the data of the transmission channels, which are each transmitted in a time slot, are in turn each linked with their own code to form a code function Ci ... C m in accordance with the code division multiplex method.
  • the resulting frequency spectrum is shown in Fig. 3c.
  • the codes used are based, for example, on so-called Walsh functions, which are periodic, assume the values +1 and -1 and form an orthonormal system. With the help of the Walsh functions and pseudo-random functions, codes can be generated that are orthogonal to each other and can thus be clearly determined by forming the correlation.
  • a total of k * n * m channels (signals) can be transmitted at k transmission frequencies (or k wavelengths of light) with n timeslots per transmission frequency and m code functions per timeslot (see FIG. 3c).
  • FDMA-TDMA-CDMA three-dimensional medium access method
  • FIG. 4 schematically shows an example of an optical data transmission system in which the data transmission takes place by means of the method according to the invention.
  • each optical transmission device each consisting of a code ultiplex device lli ... ll k , a time-division multiplex device 12 ⁇ ... 12 k and an optical transmitter 13 ⁇ ... 13k (eg laser diode) processes the data from a number of n * m channels for data transmission; the same applies to each optical receiving device, each consisting of an optical receiver 23 ⁇ ... 23 (eg photodiode), a time demultiplexing device 22 ⁇ ... 22 k and a code multiplexing device 21 ⁇ ... 21 k .
  • optical multiplexer 1 In each case several of the optical transmission devices together with an optical wavelength multiplexer 14 result in the optical multiplexer 1.
  • optical demultiplexer 2 which consists of several optical receiving devices and an optical wavelength demultiplexer 24.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

L'invention concerne un procédé pour la transmission de données par l'intermédiaire de fibres optiques, selon lequel les procédés de multiplexage par répartition en fréquence (ou en longueur d'onde), par répartition dans le temps et par répartition de code sont combinés les uns avec les autres pour assurer la transmission des données. L'invention concerne également un dispositif d'émission optique, un dispositif de réception optique, un multiplexeur optique (1) et un démultiplexeur optique (2) pour l'exécution de ce procédé.
PCT/DE2001/004289 2000-11-30 2001-11-15 Procede et dispositif pour la transmission de donnees par l'intermediaire de fibres optiques WO2002045312A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10059559.6 2000-11-30
DE10059559A DE10059559A1 (de) 2000-11-30 2000-11-30 Verfahren und Vorrichtung zur Datenübertragung über Lichtwellenleiter

Publications (2)

Publication Number Publication Date
WO2002045312A2 true WO2002045312A2 (fr) 2002-06-06
WO2002045312A3 WO2002045312A3 (fr) 2003-01-30

Family

ID=7665299

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2001/004289 WO2002045312A2 (fr) 2000-11-30 2001-11-15 Procede et dispositif pour la transmission de donnees par l'intermediaire de fibres optiques

Country Status (2)

Country Link
DE (1) DE10059559A1 (fr)
WO (1) WO2002045312A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082175A1 (fr) * 2003-03-10 2004-09-23 Matsushita Electric Industrial Co. Ltd. Systeme de transmission optique a train d'impulsions et appareils d'emission et de reception utilises

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5559625A (en) * 1992-09-14 1996-09-24 British Telecommunications Public Limited Company Distributive communications network
WO2000064087A1 (fr) * 1999-04-19 2000-10-26 General Instrument Corporation Architecture bidirectionnelle de reseau dwdm presentant une augmentation de capacite et un systeme d'empilage de frequences
EP1139597A2 (fr) * 2000-03-28 2001-10-04 Alcatel Réseau optique

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6018528A (en) * 1994-04-28 2000-01-25 At&T Corp System and method for optimizing spectral efficiency using time-frequency-code slicing
US6025944A (en) * 1997-03-27 2000-02-15 Mendez R&D Associates Wavelength division multiplexing/code division multiple access hybrid
US6151336A (en) * 1998-02-11 2000-11-21 Sorrento Networks, Inc. Time division multiplexing expansion subsystem

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5559625A (en) * 1992-09-14 1996-09-24 British Telecommunications Public Limited Company Distributive communications network
WO2000064087A1 (fr) * 1999-04-19 2000-10-26 General Instrument Corporation Architecture bidirectionnelle de reseau dwdm presentant une augmentation de capacite et un systeme d'empilage de frequences
EP1139597A2 (fr) * 2000-03-28 2001-10-04 Alcatel Réseau optique

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
KAROL M J ET AL: "TIME-FREQUENCY-CODE SLICING: EFFICIENTLY ALLOCATING THE COMMUNICATIONS SPECTRUM TO MULTIRATE USERS" IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, IEEE INC. NEW YORK, US, Bd. 46, Nr. 4, 1. November 1997 (1997-11-01), Seiten 818-826, XP000754819 ISSN: 0018-9545 *
TSUDA H ET AL: "Spectral encoding and decoding of 10 Gbit/s femtosecond pulses using high resolution arrayed-waveguide grating" ELECTRONICS LETTERS, IEE STEVENAGE, GB, Bd. 35, Nr. 14, 8. Juli 1999 (1999-07-08), Seiten 1186-1188, XP006012364 ISSN: 0013-5194 *
ZHANG J-G: "Using advanced optical multiple-access techniques in high-speed avionic local area networks for future aircraft applications Part II: Optical time-division multiple-access networks" ISA TRANSACTIONS, INSTRUMENT SOCIETY OF AMERICA. PITTSBURGH, US, Bd. 36, Nr. 4, 1997, Seiten 321-338, XP004118385 ISSN: 0019-0578 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004082175A1 (fr) * 2003-03-10 2004-09-23 Matsushita Electric Industrial Co. Ltd. Systeme de transmission optique a train d'impulsions et appareils d'emission et de reception utilises

Also Published As

Publication number Publication date
DE10059559A1 (de) 2002-06-13
WO2002045312A3 (fr) 2003-01-30

Similar Documents

Publication Publication Date Title
EP0210698B1 (fr) Système de radio-transmission avec durée variable des intervalles temporaires d'une trame multiplex dans le temps
EP0210700B1 (fr) Système de radio-transmission numérique avec canal de service central associé à la communication dans la trame multiplexée dans le temps
DE3787724T3 (de) Spreizspektrummultiplex-übertragungssystem.
DE3789779T2 (de) Lichtwellen-Übertragungssystem.
DE69631110T2 (de) Nachrichtenübertragungssystem mit mehreren Wellenlängen und gechirpten Pulsen
EP0461380B1 (fr) Système de transmission de données radio, notamment système de radio mobile cellulaire
DE69013662T2 (de) Schmalbandige Laserquelle.
EP0196723B1 (fr) Méthode et circuit pour la synchronisation des dispositifs de réception dans un système de transmission multiplex numérique
EP0211460A2 (fr) Procédé de radio-transmission numérique
DE60124588T2 (de) Hybride spreizband-technik zur erweiterung der kanalkapazität
DE19549148A1 (de) Verfahren und Anordnung zur Funkübertragung von digitalen Signalen
DE69600033T2 (de) Verfahren zur Verwaltung eines optischen Ringes mit Wellenlängenmultiplex
DE10050878B4 (de) Verfahren zur Übertragung von mehreren Informationssymbolen
DE69227350T2 (de) Verfahren und einrichtung zum unterbringen einer veränderlichen anzahl von übertragungskanälen in einem spreizspektrumübertragungssystem
DE69229277T2 (de) Zeitspreiz-kodemultiplexvielfachzugriffsverfahren mit beliebiger spektrumformung
EP1026849A2 (fr) Système de transmission optique ainsi qu'émetteur et récepteur
WO2002045312A2 (fr) Procede et dispositif pour la transmission de donnees par l'intermediaire de fibres optiques
DE1290995B (de) Streustrahl-Diversity-UEbertragungssystem
EP0440081A2 (fr) Système de radio mobile cellulaire
DE69314276T2 (de) Verfahren zur einstellung eines hf-bandpassfilters
EP1358771B1 (fr) Systeme de transmission de donnees
DE60315461T2 (de) Verfahren und Vorrichtung zum erleichtern schnelleren Erlangen von Zielzellensignalen
DE3644174C2 (fr)
DE2203287C3 (de) Fernmeldeanlagen mit Relaisstation und ortsfesten und/oder beweglichen Teilnehmerstationen
DE60221314T2 (de) Verfahren zur Ressourcenzuteilung in einem drahtlosen Netz mit Frequenzsprung

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): CA US

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase