WO2015093693A1 - Système dwdm utilisant un awg cyclique - Google Patents

Système dwdm utilisant un awg cyclique Download PDF

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Publication number
WO2015093693A1
WO2015093693A1 PCT/KR2014/004202 KR2014004202W WO2015093693A1 WO 2015093693 A1 WO2015093693 A1 WO 2015093693A1 KR 2014004202 W KR2014004202 W KR 2014004202W WO 2015093693 A1 WO2015093693 A1 WO 2015093693A1
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WIPO (PCT)
Prior art keywords
awg
wavelength
cyclic
onu
band
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PCT/KR2014/004202
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English (en)
Korean (ko)
Inventor
김정수
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주식회사 포벨
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Publication of WO2015093693A1 publication Critical patent/WO2015093693A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • 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
    • H04B10/2587—Arrangements specific to fibre transmission using a single light source for multiple stations

Definitions

  • the present invention relates to a dense wavelength division multiplexing (DWDM) system, and in particular, a dense wavelength division multiplexing (DWDM) system configured using a cyclic cyclic arrayed waveguide grating (AWG) in which wavelength separation is periodically performed. It is about.
  • DWDM dense wavelength division multiplexing
  • AMG arrayed waveguide grating
  • Dense Wavelength Division Multiplexing (DWDM) system refers to a method of transmitting or receiving a large amount of information using a plurality of optical communication channels having a very dense wavelength interval through one optical fiber.
  • the DWDM wavelength interval is set to 200 GHz, 100 GHz, 50 GHz, etc. as the frequency interval.
  • An arrayed waveguide grating (AWG) device is used as a method of easily separating such narrow wavelength optical channels.
  • Arrayed Waveguide Grating (AWG) is a device that separates optical signals of very dense wavelength intervals into waveguides of different paths. These AWGs have the ability to separate wavelengths at 100 or 50 GHz intervals.
  • 1 shows a process of frequency separation in a cyclic AWG in which wavelength separation is a periodic characteristic. 1, ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, ⁇ 5, ⁇ 6, ⁇ 7, ⁇ 8, ⁇ 9, ⁇ 10, ⁇ 11, ⁇ 12, ⁇ 13, ⁇ 14, ⁇ 15, and ⁇ 16 with constant frequency spacing to one port 101 of the cyclic AWG.
  • an optical signal such as ..., etc.
  • optical signals of ⁇ 1, ⁇ 5, ⁇ 9 and ⁇ 13 are output to the other port 121, and optical signals of ⁇ 2, ⁇ 6, ⁇ 10 and ⁇ 14 are output to the other port 122, Optical signals of ⁇ 3, ⁇ 7, ⁇ 11, and ⁇ 15 are output to the other port 123, and optical signals of ⁇ 4, ⁇ 8, ⁇ 12 and ⁇ 16 are output to the other port 124. .
  • Such a cyclic AWG may be used to enable bidirectional communication according to a wavelength because an optical signal input to the other ports 121, 122, 123, and 124 may be output to one port 101.
  • bidirectional communication of a signal may be performed using a cyclic AWG having a cyclic characteristic.
  • Figure 2 shows a bi-directional communication method of the signal using the cyclic characteristics of the AWG shown in the prior art US Patent Publication No. US2011-0033187.
  • the light emitting device of the optical network unit (ONU) which is an optical module for bidirectional communication of the optical subscriber network, uses a wavelength of C-band (1530 nm to 1565 nm), and the light emitting device of the optical line terminal (OLT) is S-Band. A wavelength of (1460 nm to 1530 nm) is used.
  • the light emitting device of the ONU uses a reflective semiconductor optical amplifier (RSAA) or a fabric-perot (FP) type laser diode chip having an antireflective coating on one light emitting surface.
  • RSAA reflective semiconductor optical amplifier
  • FP fabric-perot
  • the light emission wavelength of the light emitting device of ONU is injected into the RSOA chip through the cyclic AWG among the C-band light sources indicated by reference numeral 210, and the chip of the RSOA is locked to the wavelength injected through the AWG to pass through the AWG. Emit light of a wavelength. Therefore, the frequency of the laser light emitted from the light emitting device of the ONU is determined by the frequency selected from the AWG among the C-band light sources indicated by reference numeral 210. Accordingly, the laser light emitted from the RSOA of the ONU is transmitted to the OLT through the AWG. do. In such a structure, the optical frequency of the ONU is not predetermined, but is determined by which AWG channel is connected.
  • the ONU has a colorless characteristic that can be used for all the AWG channels.
  • This colorless feature is that when the large-scale optical subscriber network is constructed, the same optical module can be used instead of different optical modules for each subscriber, so that the construction and maintenance of the optical subscriber network is easy. have.
  • the optical signal emitted from the OLT passes through the AWG using the cyclic characteristics of the AWG, light of a specific frequency is incident on a specific ONU module, thereby bidirectional communication to one ONU using the same AWG port. There is an advantage to doing this.
  • Patent Document 1 US Patent Publication No. US2011-0033187 (2011.02.10)
  • An object of the present invention is to configure a DWDM-class compact wavelength multiplexing using an AWG having a cyclic characteristic in the bidirectional communication using a single optical fiber, the light emitting device is a conventional DFB-LD (Distributed Feedback-)
  • the purpose of the present invention is to provide a DWDM system using a cyclic AWG that enables a DWDM with a frequency interval of 100 GHz, 50 GHz, and 25 GHz over a single optical fiber using a laser diode.
  • the system is configured by using at least four bands of the cyclic AWG, but at least one of the ONU or the OLT implements a light emitting device using the DFB-LD, and the DFB- The frequency of DFB-LD is changed by changing the temperature of LD.
  • the present invention not only eliminates the need for a seed light source required in the prior art by constructing a DWDM bidirectional communication system of 100 GHz, 50 GHz, and 25 GHz using existing conventional DFB-LDs, but also at least any of the OLT or ONU.
  • the DFB-LD has the characteristics of a tunable laser using frequency variability according to temperature, so that the system can be installed, maintained, and repaired using an optical module having the same characteristics. This can reduce the maintenance cost.
  • FIG. 1 is a conceptual diagram illustrating a process of separating frequencies in a conventional cyclic AWG
  • FIG. 2 illustrates an example of a DWDM system using a conventional reflective semiconductor optical amplifier (RSAA) or a fabric-perot (FP) type laser diode chip.
  • RSAA reflective semiconductor optical amplifier
  • FP fabric-perot
  • FIG 3 illustrates a DWDM system using cyclic AWG using wavelength variability according to temperature of the DFB-LD chip according to the present invention.
  • the oscillation frequency of the DFB-LD is varied depending on the temperature, and the oscillation frequency changes with the change of temperature with a slope of about 12.5 GHz / ° C. Therefore, when the temperature of the DFB-LD is changed to about 100 ° C, the oscillation frequency of about 1250GHz is changed.
  • the temperature of the laser diode chip must be maintained at a constant temperature regardless of the external temperature. Therefore, the temperature of the laser diode chip must be kept constant using a thermoelectric element.
  • a laser diode chip of InGaAsP material using an InP substrate used in optical communication is driven at a temperature within 70 ° C. because the output light intensity varies depending on the driving temperature.
  • thermoelectric element When the temperature of the optical module is high and you want to keep the temperature of the laser diode chip constant using a thermoelectric element. Due to the limitation of the driving capability of the thermoelectric element, the temperature of the thermoelectric element is operated in a range of approximately 30 to 70. Therefore, DFB-LD can change the frequency of about 600GHz according to the operating temperature of the thermoelectric element.
  • the wavelength using a specific AWG port is determined as a specific wavelength.
  • the wavelength is not uniform for each laser diode chip manufactured by one wafer due to the unevenness of the semiconductor manufacturing process. This nonuniformity typically shows a 2-3 nm wavelength spacing.
  • the DFB-LD chip it is very difficult to use the DFB-LD chip to have the same oscillation frequency at the same temperature. Differences in the oscillation frequency distributed by each laser diode chip at a specific temperature and difficulty in controlling the oscillation frequency of the laser diode chip make it difficult to make all chips have a specific wavelength at a specific temperature. It is also difficult to use.
  • FIG. 3 illustrates an operation principle of a DWDM system for bidirectional communication using one optical fiber using at least four or more bands of a cyclic AWG according to an embodiment of the present invention.
  • FIG. 3 illustrates the operation of a DWDM system using 8-channel cyclic AWGs having a frequency interval of 50 GHz between channels, but other frequency intervals and channel intervals may be used. For example, a 25 GHz, 16-channel cyclic AWG is possible.
  • five bands (ONU band1, ONU band2, Guard band, OLT band1, and OLT band2) of the cyclic AWG are used, but either one of the OLT or the ONU is variable in wavelength. If not used as a laser, only four bands can constitute a DWDM system.
  • the ONU oscillation wavelength is set to ⁇ 1 to ⁇ 16
  • the guard band is ⁇ 17 to ⁇ 24
  • the OLT oscillation wavelength is set to ⁇ 25 to ⁇ 32.
  • a particular DFB-LD has a wavelength of ⁇ 3 at a temperature of 33 ° C., for example. Since the DFB-LD chip exhibits a frequency change with a temperature of 12.5 GHz / ° C., the temperature rise of 4 ° C. in this DFB-LD changes the oscillation frequency of the laser diode chip to ⁇ 4, which is an adjacent channel of the AWG. Therefore, a laser diode chip having an oscillation frequency of ⁇ 3 at 33 ° C has a frequency of ⁇ 4 at 37 ° C, ⁇ 5 at 41 ° C, ⁇ 6 at 45 ° C, ⁇ 7 at 49 ° C, and ⁇ 8 at 53 ° C, and ⁇ 1, at 57 ° C. It has a frequency of ⁇ 2 at 61 ° C. Therefore, this DFB-LD chip can realize a frequency corresponding to all channels of the cyclic AWG with a temperature change of 33 ° C to 61 ° C.
  • a particular DFB-LD has a wavelength of ⁇ 7 at a temperature of 33 ° C.
  • Such a DFB-LD chip has a frequency of ⁇ 8 at 37 ° C, ⁇ 1 at 41 ° C, ⁇ 2 at 45 ° C, ⁇ 3 at 49 ° C, ⁇ 3 at 53 ° C, and ⁇ 4 at 53 ° C, and ⁇ 5 at 57 ° C and ⁇ 6 at 61 ° C. do. Therefore, even when using the DFB-LD having a certain frequency at 33 °C, it is possible to implement a frequency corresponding to all channels of the cyclic AWG with a temperature change of 33 °C to 61 °C. This makes it very easy to implement DWDM.
  • An important technical feature of the present invention is a structure capable of bidirectional communication with one optical fiber by using a plurality of bands of the cyclic AWG.
  • at least two cyclic AWG bands are allocated to an OLT or ONU optical module to which a tunable AWG wavelength laser is applied, and at least one to an optical module to which a fixed wavelength laser is applied instead of the tunable laser. Allocate a click AWG band and separate the OLT band and the ONU band into at least one cyclic AWG band.
  • the required number of cyclic AWG bands is at least five.
  • the band width of one band of a 50 GHz 8 channel cyclic AWG is approximately 3.2 nm, so the bands of five cyclic AWGs cover a total of 16 nm wavelength bands.
  • Coarse wavelength division multiplexing which is currently deployed worldwide, sets the wavelength of 20 nm to one band, and the present invention can be applied to a technology for easily converting one band of CWDM to DWDM.
  • This feature of the present invention can be expanded and modified to 100GHz 4 channels or 25GHz 16 channels.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Integrated Circuits (AREA)

Abstract

La présente invention concerne un système de multiplexage par répartition en longueur d'onde dense (DWDM) configuré à l'aide d'un réseau sélectif planaire (AWG) cyclique dans lequel une longueur d'onde est séparée de manière périodique. Un système DWDB selon la présente invention correspond à un système DWDB qui utilise l'AWG cyclique et une puce à diode laser (DL) DFB sur au moins un côté d'un OLT ou d'une ONU, deux bandes d'AWG cyclique ou plus étant attribuées à un module optique OLT ou ONU sur lequel une DL DFB accordable en longueur d'onde est appliquée, au moins une bande d'AWG cyclique étant attribuée à un module optique sur lequel un laser du type à longueur d'onde fixe, et non pas un laser accordable en longueur d'onde, est appliqué, et une bande pour l'OLT et une bande pour l'ONU étant séparées par une ou plusieurs bandes d'AWG cylique, de sorte que la fréquence puisse être modifiée par variation de la température d'une DL DFB. Par conséquent, la présente invention permet une réduction du prix d'un module optique et permet une communication bidirectionnelle par le biais d'une fibre optique.
PCT/KR2014/004202 2013-12-18 2014-05-12 Système dwdm utilisant un awg cyclique WO2015093693A1 (fr)

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Application Number Priority Date Filing Date Title
KR1020130158720A KR20150071558A (ko) 2013-12-18 2013-12-18 사이클릭 awg를 이용한 dwdm 시스템
KR10-2013-0158720 2013-12-18

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000030977A (ko) * 1998-10-31 2000-06-05 강병호 레이저 다이오드의 다채널 출력광 파장 조정장치
KR100683833B1 (ko) * 2005-12-28 2007-02-16 한국과학기술원 파장 할당 방법을 이용한 다단 분기 파장분할 다중방식수동형 광 가입자망 장치
JP2008103766A (ja) * 2003-01-14 2008-05-01 Nippon Telegr & Teleph Corp <Ntt> 高速波長可変分布帰還型半導体レーザアレイ及び分布帰還型半導体レーザ
KR100942459B1 (ko) * 2008-03-18 2010-02-16 주식회사 피피아이 Ｗｄｍ－ｐｏｎ용 멀티 밴드 ａｗｇ모듈
KR20110096484A (ko) * 2010-02-22 2011-08-30 소니 주식회사 신호 전송 장치, 신호 전송 방법, 신호 수신 장치, 신호 수신 방법 및 신호 전송 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000030977A (ko) * 1998-10-31 2000-06-05 강병호 레이저 다이오드의 다채널 출력광 파장 조정장치
JP2008103766A (ja) * 2003-01-14 2008-05-01 Nippon Telegr & Teleph Corp <Ntt> 高速波長可変分布帰還型半導体レーザアレイ及び分布帰還型半導体レーザ
KR100683833B1 (ko) * 2005-12-28 2007-02-16 한국과학기술원 파장 할당 방법을 이용한 다단 분기 파장분할 다중방식수동형 광 가입자망 장치
KR100942459B1 (ko) * 2008-03-18 2010-02-16 주식회사 피피아이 Ｗｄｍ－ｐｏｎ용 멀티 밴드 ａｗｇ모듈
KR20110096484A (ko) * 2010-02-22 2011-08-30 소니 주식회사 신호 전송 장치, 신호 전송 방법, 신호 수신 장치, 신호 수신 방법 및 신호 전송 시스템

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