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Method, System and Transceiver Device for Bi-Directionally

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Method, System and Transceiver Device for Bi-Directionally (19) TZZ ¥Z ¥_T (11) EP 2 830 239 A1 (12) EUROPEAN PATENT APPLICATION (43) Date of publication: (51) Int Cl.: 28.01.2015 Bulletin 2015/05 H04B 10/25 (2013.01) H04J 14/02 (2006.01) H04B 10/516 (2013.01) (21) Application number: 13003679.1 (22) Date of filing: 23.07.2013 (84) Designated Contracting States: • Elbers, Jörg-Peter AL AT BE BG CH CY CZ DE DK EE ES FI FR GB 82256 Fürstenfeldbruck (DE) GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO • Griesser, Helmut PL PT RO RS SE SI SK SM TR 86551 Aichach (DE) Designated Extension States: • Eiselt, Michael BA ME 99334 Kirchheim (DE) (71) Applicant: ADVA AG Optical Networking (74) Representative: Eder, Thomas 98617 Meiningen (DE) Eder & Schieschke Patentanwälte (72) Inventors: Elisabethstrasse 34 • Grobe, Klaus 80796 München (DE) 82152 Planegg (DE) (54) Method, system and transceiver device for bi- directionally transmitting digital optical signals over an optical transmission link (57) The invention relates to a method for bi-direc- (S1TX,CHI) received at the second end of the optical trans- tionally transmitting digital optical signals over an optical mission link, the optical wavelength reuse signal being transmission link, wherein a first optical transmit signal modulated according to a second digital signal in such a (S1TX,CHI) at a predetermined optical wavelength is sup- way that the bit information of the second digital signal plied to a first end of the optical transmission link and is included in second sections of the symbol interval of transmitted in a first transmission direction to a second the first optical transmit signal (S1TX,CHI) received. Ac- end of the optical transmission link, wherein a second cording to the invention, the first binary digital signal optical transmit signal (S2TX,CHI) at said predetermined (S1TXI) is a non-retum-to-zero signal and the first optical optical wavelength is supplied to the second end of the transmit signal (S1TX,CHI) is an optical bit-interleaved optical transmission link and transmitted in a second op- seeding signal having a symbol rate equal to the bit rate posite transmission direction to the first end of the optical of the first binary digital signal (S1 TXI), wherein the sym- transmission link, wherein said first optical transmit signal bol interval of the optical bit-interleaved seeding signal (S1TX,CHI) is created according to a first binary digital is divided Into two equally long sub-intervals, the bit In- signal (S1TXI) in such a way that the bit information of the formation of the first binary digital signal (S1TXI) being first binarydigital signal (S1 TXI) isincluded in first sections transported in a first of the two sub- intervals and the sec- of the symbol interval of the first optical transmit signal, ond sub-intervals being set to a seeding level with respect and wherein said second optical transmit signalto the optical power. (S2TX,CHI) is created by creating an optical wavelength reuse signal using the first optical transmit signal EP 2 830 239 A1 Printed by Jouve, 75001 PARIS (FR) (Cont. next page) EP 2 830 239 A1 2 1 EP 2 830 239 A1 2 Description lowing description, a level "0" or a logical value "0" of an amplitude-modulated optical signal shall be understood [0001] The invention relates to a system and a method in such a way that an optical power of essentially zero or for bi-directionally transmitting digital optical signals over at least significantly below the "1" level, for example 10 an optical transmission link as well as to an optical trans- 5 dB below the "1" level, is transported within the respective ceiver device for a respective system. symbol interval. Therefore, another modulation format [0002] In optical wavelength division multiplex (WDM) than NRZ-OOK must be chosen for the downstream sig- passive optical networks, which are commonly applied nals. However, other modulation formats always Involve to realize fiber-to-the home access structures, a plurality additional effort and costs. of optical network units (ONU) is connected to a central 10 [0007] A known approach for a WDM-PON applying node, also referred to as optical line terminal (OLT), via wavelength-reuse is based on using frequency-shift key- a remote node (RN). Each ONU connects at least one ing (FSK) for the downstream signal, wherein this signal end-user to the RN. Generally, a single fiber is used for reveals an essentially constant envelope, and a standard connecting the RN to the ONUs in order to save fiber OOK modulation format for the upstream signal. Instead usage. Using a single-fiber connection between the OLT 15 of FSK any other modulation format may be used that and the RN further reduces the fiber usage. However, produces a downstream signal having an essentially con- PON configurations with dual-fiber connection between stant envelope, like any phase shift keying (PSK) format. the OLT and the RN are also widely used. Often, a pro- [0008] Further, it has been proposed to use an inverse- tection mechanism, especially a fiber-protection method retum-to-zero (IRZ) OOK modulation format for the and hardware, may be implemented for the transmission 20 downstream signal and an RZ OOK modulation format link between the OLT and the RN. for the related upstream signal. [0003] PONs enable a bi-directional point-to-point con- [0009] However, all these solutions require costly com- nection between each ONU and the OLT using dedicated ponents, e.g. FSK demodulators or IRZ/RZ pulse shap- optical channels, i.e. for each point-to-point connection ing within the ONU, or increase the bandwidth necessary a pair of downstream and upstream signals having pre- 25 to transmit the downstream or even the downstream and determined optical wavelengths is used. In general, the the upstream signals and thus increase the costs for the downstream channel signal transmitted from the OLT to components necessary to process the respective sig- the respective ONU and the upstream channel signal nals. transmitted in the reverse direction may have identical [0010] Based on this known prior art, it is an object of or differing optical wavelengths. The plurality of down- 30 the present invention to provide a system and method stream and upstream optical channel signals is transmit- for bi-directionally transmitting digital optical signals over ted as a combined WDM signal within the transmission an optical transmission link which applies wavelength re- link between the OLT and the RN. use and which can be implemented simply and at low [0004] One of the main challenges when deploying this costs. It is a further object of the invention to provide an PON technology in access networks consists in the35 optical transceiver device for realizing a respective sys- wavelength-assignment problem of WDM transmitters tem. and the costs related therewith. The costs of installation, [0011] The invention achieves these objects with the administration, and maintenance for a PON can be dras- combination of features of claims 1, 10 and 13, respec- tically reduced if at least the ONUs reveal a so-called tively. "colorless", i.e. non-wavelength-specific, design. Typical 40 [0012] According to the present invention, a first optical low-cost solutions for colorless ONUs are based on the transmit signal at a predetermined optical wavelength is use of reflective optical transmitters like semiconductor created and supplied to a first end of an optical transmis- optical amplifiers (RSOA), injection-locked Fabry-Perot sion link and transmitted in a first transmission direction laser diodes (IL-FP-LD) or reflective electro-absorption to a second end of the optical transmission link. This first modulators with integrated semiconductor optical ampli- 45 optical transmit signal is created in such a way that It can fiers (REAM-SOA) as optical transmitter components. be reused at the second end of the transmission link for [0005] In a PON design using such reflective optical creating a second optical transmit signal, preferably by transmitters, the downstream (channel) signals can be using a reflective modulator device. This second optical reused in the ONUs in order to create an upstream signal transmit signal is transmitted in a second transmission having the same wavelength. Thus, such a system for 50 direction to the first end of the optical transmission link. bi-directionally transmitting digital optical signals over an Said first optical transmit signal is created according to optical transmission link is referred to as wavelength-re- a first binary digital signal in such a way that the bit in- use transmission systems. formation of the first binary digital signal is included in [0006] In a WDM-PON with wavelength reuse, the (op- first sections of the symbol interval of the first optical tical) downstream (channel) signals must not use stand- 55 transmit signal, ard non-retum-to-zero (NRZ) on-off keying (OOK) be- [0013] Said second optical transmit signal is created cause for levels "0" sent, upstream modulation is impos- by creating an optical wavelength reuse signal using the sible or subject to severe penalties. Here and in the fol- first optical transmit signal received at the second end of 3 3 EP 2 830 239 A1 4 the optical transmission link. The optical wavelength re- coding the pre-coded binary bit-interleaved digital signal use signal is modulated according to a second digital and modulating an optical light source having the prede- signal in such a way that the bit information of the second termined optical wavelength using the pre-coded and en- digital signal is included in second sections of the symbol coded binary bit-interleaved digital signal as modulation interval of the first optical transmit signal received.
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