차세대 광 가입자 전송기술

발표 순서

I. 광 가입자 망 개요

II. 기술 동향

III.국내외 R&D 현황

IV.NG-PON3 전망

V. 맺음말

3

I. 광 가입자 망 개요

4

0

5

10

15

20

25

30

35

40

45

Source: OECD

Other Fibre/LAN Cable DSL

OECD average

Broadband Statics in OECD

OECD Fixed broadband subscriptions per 100 inhabitants, by technology, June 2013

5

0

20

40

60

80

100

120

Dedicated mobile data subscriptions

Standard mobile broadband subscriptions

Terrestrial fixed wireless

Satellite

OECD wireless broadband subscriptions per 100 inhabitants, by technology, June 2013

Broadband Statics in OECD

6

Broadband Impact on GDP

Source: GSR 2010 Discussion Paper from ITU

7

Giga Internet Project

8

광 가입자 망 개요

xDSL

광 LAN

DSLAM

Metro Aggregation S/W

FES L3 S/W

SER

TDM TDM

OLT ONT

MD

RN

ONT RN OLT

Speed Optical Access Network Metro Network Core Network

20km 100km 1000km

10Mbps

100Mbps

10Gbps

Coverage

DU

RU

PGW

FTTH

NG Access

Mobile Fronthaul Biz. Subscriber

100Gbps

SGW

BRAS

5G Packet Core

EPC

SER

DSL: Digital Subscriber’s Line, EPC: Evolved Packet Core, FTTH: Fiber-To-The-Home, FES: Fast Ethernet Switch, RN: Remote Node, ONT: Optical Network Terminal, OLT: Optical Link Termination, RU: Radio Unit, SER: Service Edge Router

9

광 가입자 기술 로드맵

Trend 1: 액세스망의 고속화, 광역화, 고품질화 및 융합화 방향으로 기술 진화

Trend 2: TDM에서 품질 보장이 가능한 WDM, TWDM에 이어 SDN 기반 Adaptive PON 기술로 진화

Trend 3: Legacy PON 수용하는 하이브리드 플랫폼, 무선 액세스망 수용하는 융합 플랫폼으로 진화

FTTH

EPON

2005 2010

Wired-Wireless Converged

2000 2015 연대

서비스

TDM

WDM

FDM

GPON

Injection Seeding

OFDMA-PON

1.25Gbps (2.5Gbps) 10Gbps 10Mbps 속도

물리계층 기술

100Mbps

2020~

40Gbps

40G TDM-PON

NG-PON1

NG-PON2

NG-PON3

Coherent PON

OFDM-TDM-PON

OFDM-WDMA-PON

Array/Tunable WDM-PON

WDM/TDM Hybrid PON TWDM-PON

10G EPON

XG-PON

FDM: Frequency Division Multiplexing, TDM: Time Division Multiplexing, WDM: Wavelength Division Multiplexing, NG-PON: Next Generation Passive Optical Network, EPON: Ethernet PON, GPON: Gigabit Capable PON, FTTH: Fiber-To-The-Home, XG-PON: 10G GPON, TWDM-PON: Time and Wavelength Division Multiplexing PON, OFDMA-PON: Optical Frequency Division Multiplexing Access PON, SDP: Software Defined Photonics

10

광 가입자 기술 수요 Mobile fronthaul/backhaul

Business service application

Data Center

CO consolidation

데이터센터 규모= 90km2

광섬유 길이 = 6,400km Rack 당 용량 = 100TB 매일 증설되는 서버 수 > 1,000

Typical reach is 100‐125 meters but trending toward 300‐400 meters for big data centers. The remaining 5% are long reach lengths spanning the data center or campus network from 400 meters to 1.5 km.

100G LR4 - $11,000(10km) 100G SR10- $1,500(100m)

10G EPON 및 대용량 OLT(1T급) 도입으로 광역화 수요 발생(KT)

“…45% of respondents plan to use RU and with it the CPRI protocol for “fronthaul,” that is, fiber-connecting a group of RRHs from a baseband unit…”(Infonetics Research, 2014.01.)

Dater Center내 광 연결을 위해 저가형 광 트랜시버 수요 발생

Reach Extender

대용량 OLT

10G

10G

10G

40km 20km

고분기 (1:128…)

Cloud 기지국용 광 연결 수요 발생

11

Tactile Internet

Source: ‘5G-What Will It Be: The Tactile Internet’, ICC 2013

12

Source: Alcatel-Lucent, FSAN meeting 2014.02.

이동통신 클라우드 기지국 발전 전망

13

이동통신 클라우드 기지국 발전 전망

Source: Alcatel-Lucent, FSAN meeting 2014.02.

14

Source: Alcatel-Lucent, FSAN meeting 2014.02.

IDC 네트워킹 발전 전망

15

IDC 네트워킹 발전 전망

Source: Alcatel-Lucent, FSAN meeting 2014.02.

16

II. 기술 동향

17

NG-PON2 TWDM PON: 10G x 4ch/8ch. DS, 2.5G(10G) λ-Tunable US

WDM overlay(PtP WDM-PON): 1-10Gbps /ch

Key Requirements

• 2.5G/10G aggregate, 1 Gb/s per sub., 40 km passive reach, > 64 subs.

• Re-use of outside plant, coexistence

• Challenge: λ-tunable TX/RX ONU, wavelength management, load balancing and etc.

• Additional requirements are still under debate

Tunable ONU1

Tunable ONU2

Tunable ONU3

Tunable ONU4

Tunable ONU5

Tunable ONUN

Port1

Port2

Port8

λ1

λ2

λ8

Down: 2.5 Gb/s, 10 Gb/s

Up: 2.5 Gb/s, 10 Gb/s

20km

CEx

TWDM-PON

Port1

Port2

Port40

λ1

λ2

λ40

PtP WDM

18

ITU-T standard work related Fronthaul G.metro (Multichannel bi-directional DWDM applications with port agnostic single-channel optical interfaces)

’14.3, ITU-T SG15 approved to start G.metro as a new work item with having low-cost metro application including Fronthaul

’16.6, The recommendation will be published

14 Supporting members that are committing to contributing to the work item

BT (UK), Huawei (China), Xtera (USA), Ericsson (Sweden), Italy, ETRI (Korea), Coriant (Germany), DT (Germany), Transmode (Sweden), ZTE (China), ADVA (UK), Softbank (Japan), China Unicom (China), Fiberhome (China)

Important Features

Automatically adapt tail-end transmitter (TLD was supported strongly by multi companies in ITU-T SG15 Q.6)

OD/OMs or OADMs are included in the link

Up to 10Gb/s (channel spacing frequency spacing to be discussed)

MPI-SM

for signals

going

MPI-RM

for signals

going

RS for signals going

SS for signals going

RS

SS

RS

SS

Head-end

OD

/OM

Rx2

Tx2

RxN

TxN DWDM link

Rx

Tx

Rx

Tx

DWDM network elements Rx1

Tx1

OD

/OM

Rx

Tx Rx

Tx

SS

RS

…

OADM

19

Cloud BS Evolution Trend

20

Cloud BS Evolution Trend

21

Cloud BS Evolution Trend

22

국내 이동통신 프론트홀 구축 현황

22

Current Status of Mobile Fronthaul

DU

1

2

8 1

2

16

CWDM

Core Ring • • •

COT

RT1

9

10

16 RT2

16

8 SV

SV

10G

10G CPRI

MUX

2.5G

2.5G

2.5G

2.5G

Mobile Carriers prefer ring type COT-RT architecture with cost effective CWDM

Employing 16 CWDM wavelengths in a unit ring configuration

Requiring additional 1 wavelength for supervisory and control channel besides CPRI data channels

Current commercial LTE services need one 2.5Gbps(CPRI Option 3) channel for 1 RU

In the near future, approximately 30 Gbps optical transmission capacity will be necessary for LTE-A

Rel. 10 Spec. Accommodating only 1 RU/unit ring

CPRI

MUX

CPRI

MUX

CPRI

MUX

2.5G

2.5G

2.5G

2.5G RU3

RU2

RU1

RU4

Accommodating LTE-RU 32 ea using CPRI

MUX & CWDM DeMUX @RT1

• Current: 1x2.5 Gbps/RU

• Future: Require 122.5

(~30) Gbps /RU for LTE-A

Rel. 10 spec

8

23

IF 다중화 방식 프론트홀

RU configuration

(for 20 MHz

LTE signal)

1 FA, 3 sectors,

4x4 MIMO

1 FA, 3 sectors,

8x8 MIMO

2 FAs, 3 sectors,

8x8 MIMO

Minimum required

traffic handling

capacity

14.7456 Gb/s 29.4912 Gb/s 58.9824 Gb/s

Required number

of IF carrier

20 MHz IF carrier

12 ea

20 MHz IF carrier

24 ea

20 MHz IF carrier

48 ea

1. CPRI Line Rate = 30.72Mbps x 16 bit ADC/DAC x I/Q x 1FA x 3 Sector x 4 Antenna x 8B/10B coding = 14.74Gbps 2. CPRI Line Rate = 30.72Mbps x 16 bit ADC/DAC x I/Q x 1FA x 3 Sector x 8 Antenna x 8B/10B coding = 29.49Gbps 3. CPRI Line Rate = 30.72Mbps x 16 bit ADC/DAC x I/Q x 2FA x 3 Sector x 8 Antenna x 8B/10B coding = 58.98Gbps

24

III.국내외 R&D 현황

25

NG-PON2(TWDM-PON) 장비 OLT/ONU

NG-PON2용 저가형(어레이 광 모듈, 파장가변) 광 트랜시버 기술

NG-PON2용 CMOS 포토닉스 기반 TOSA/ROSA 기술

10G EPON Reach Extender 기술

10 Gb/s OFDMA-PON용 실시간 광모뎀 기술

연구목표

개 념

국내 R&D 동향-NG-PON2

26

TWDM-PON OLT용 광 트랜시버(CFP형)

실시간 OFDM 광모뎀 구현 기술

CMOS 포토닉스 기반 AWG, 광 검출기 단일 집적화 기술

10G EPON Reach Extender 기술

멀티 채널 고속 전기신호 인터페이스 원천기술 확보

실시간 전송 성능 감시/측정 가

능

실시간 전송 변수의 최적화를

통한 전송 효율 극대화

변수

U of Bangore

(영국)

ETRI (한국) 비고

Real-time

물리계층 최대 전송 대역폭

11.25 Gb/s

11.99 Gb/s

고정 변조 방식 실시간 모뎀 기준 세계 최고 수준

운용 가능한 서브캐리어 수

15 EA 117 EA

망 자원의 효율적 활용

극대화

4ch COT 4ch RT

Wavelength Conversion

10Gb/s Burst-mode CDR

(Fast locking)

10Gb/s Burst-mode

Signal Detection

Legacy WDM Interconnection

58 dB Link Budget 제공 가능

기존 10Gb/s WDM 정합을 통

한 전송링크 용량 확장

WDM/TDMA기술을 통한 비즈

니스 서비스망 최적화 가능

변수

IEEE802.3bk Extended E-PON

ETRI 비고

이득 +5 +28dB 10Gb/s PBEx기술 선점 거리 40km 80km

채널 1 4 64 확장 가능

CMOS Photonics (AWG+PD) Array TIA/Driver

국내 R&D 동향-NG-PON2

27

10Gbps Silicon Modulator

[Modulator Layout] [Modulator Photo]

국내 R&D 동향-Photonic Integration

10Gbps Ge Photodiode

[Photodiode Layout] [Photodiode Photo]

28

< 광 OFDM 모뎀/링크 통합 전송성능 시험 환경> < 광 OFDM 모뎀 시제품 >

4 GS/s DAC

PLL (CLK.)

4 GS/s ADC

MAC_FPGA

OFDM MAC 플랫폼

OFDM 모뎀 Tx

OFDM 모뎀 Rx

광송신기

광수신기

< 광 OFDM 모뎀 전송 성능 시험 환경 구성도>

DFB-LD OFDM 변조부 (ONU)

OFDM 복조부 (OLT)

PD RF att.

RF att.

RF amp.

RF amp.

21 dB 1X64 Splitter EDFA

SMF 40km

12 dB

국내 R&D 동향-OFDMA-PON

광 OFDM 변복조 모뎀 기술

초고속, 광대역 전송 가능 기술

최대 100 Gb/s 상/하향 전송

장거리 전송 100 km

망 자원의 유연한 활용 가능

시간/주파수 영역에서의 자원 할당

투명한 서비스

경제성

고속 DSP를 활용한 구현

단순한 광 기술(IM/DD) 활용

n-bit/symbol

• multi carrier 변조/전송

• M-QAM

29

국내 R&D 동향-Reach Extender

DWDM introduced in feeder span to increase link capacity

- DWDM, CWDM, T-LD, RSOA injection locking, etc.

Requirement for reach extender

- Recovery an optical signal within existing ODN

- Provide remote management using OMCI or user defined OAM

- Control an upstream burst signal(Reset or Reset-less needed)

- Change upstream burst signal to continuous signal

30

10G/1G EPON RE GPON RE

2-channel Extender

8-channel Extender

16-channel Extender

EPON RE

16-channel Wavelength Converter

16-channel Extender

16-channel Wavelength Converter

4-channel Extender

국내 R&D 동향-Reach Extender

10G/10G EPON RE

10G-EPON Extender Line card

31

국내 R&D 동향-Reach Extender

Items PR30 PMD Extended PMD

(PR40)

Bit-level OEO-based RE

(ETRI)

Maximum channel

insertion loss (dB) 29 33 58

Minimum range 0.5 m to 20 km 0.5 m to 40 km 0.5 m to 60 km

Split ratios 1:32 1:64 1:128

Number of fibers 1/Port 1/Port 1/Multiple Ports

Transmission Rate (Gb/s) 10.3125 10.3125 10.3125 x (# of WDM)

Giga인터넷

용량증대

32

목표: 고온 안정성과 비용-/에너지-저감을 위한 DWDM 기반 Photonic-integrated multi-wavelength laser source 개발

핵심기술: Reflective Photonic Integrated Circuit, Low-power SiGe driver, DWDM channel generator linecard, Reflective TX array, Multi-degree reflective ROADM, Data-center interconnection

EU FP C-3PO 연구동향 C-3PO (Colourless and Coolerless Components for low Power Optical networks, 2010.06.01.~2013.05.31., 2.60 million euro)

Coordinator: University College Cork, National University of Ireland, Cork(아일랜드)

Participants: Polatis Ltd(영국), Interuniversitair Micro-Electronica Centrum Vzw(벨기에), Constelex Technology Enablers Ltd(그리스), The Centre for Integrated Photonics

Limited(영국), Adva ag Optical Networking(독일)

<C-3PO system> As is To be

Cooled photonics, Colored linecards C-3PO for IPoDWDM

<C-3PO next-generation access network>

EU FP 연구동향

33

목표: Connectivity-demand에 따라 스위칭 노드에서 Automation을 통해 네트워크 환경(link capacity, bandwidth, switching)을 설정

핵심기술: Flexible transponder 기술, Flexible switching 기술, Multi-carrier 시스템을 위한 network planning 및 control plane 연구

EU FP FOX-C 연구동향 FOX-C (Flexible Optical Cross-connect Nodes enabling next generation flexible optical networking, 2012.10.01.~2015.09.30., 3.64 million euro)

Coordinator: Optronics Technologies A.B.E.T.E.(그리스)

Participants: Research and Education Lab. in Information Tech.(그리스), University College Cork, National University of Ireland, Cork(아일랜드), Finisar Israel Ltd(이스라엘),

W-ONE SYS SL(스페인), The Hebrew University of Jerusalem(이스라엘), Aston University(영국), France Telecom SA(프랑스), Karlsruher Institut Fuer Technologie(독일)

<COMBO 프로젝트 개념도> <스위치 노드에서의 링크 용량 계층화>

EU FP 연구동향

34

목적: Adaptive-rate-transceivers를 이용하여, traffic-demand에 따라 optical path 및 bandwidth를 할당

핵심기술: Bit-rate flexible optical transceiver, Photonic integrated chip, Optical OFDM/Nyquist WDM, Programmable modulation format, Programmable data rate, Programmable FEC

EU FP ASTRON 연구동향 ASTRON (Adaptive Software defined Terabit tRansceiver for flexible Optical Networks, 2012.10.01.~2015.09.30., 4.61 million euro)

Coordinator: Optronics Technologies A.B.E.T.E.(그리스)

Participants: Research and Education Lab. in Information Tech.(그리스), University College London(영국), Enablence Switzerland AG(스위스), Finisar Israel Ltd(이스라엘),

Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V(독일), ECI Telecom LTD.(이스라엘), Aifotec Fiberoptics GMBH(독일), National Institute of

Information and Communications Technology(일본), Universita Delgli Studi Roma Tre(이탈리아)

<Software-defined Terabit transceivers를 이용한 flexible optical network 구조>

Adaptive Optical Transmitter Adaptive Optical Receiver

EU FP 연구동향

35

목표: λ-to-the-user(1G-to-the-Home + 10G-to-the-Antenna) 개념의 40G+ Ultra Dense WDM 솔루션 개발

핵심기술: Coherent transmission 및 detection 기술, 고속 DSP 기술, 파장 제어 및 스펙트럼 관리 기술, Polarization handling 및 OBI 저감 기술 연구

EU FP COCONUT 연구동향 COCONUT (COst-effective COhereNt Ultra-dense-WDM-PON for lambda-To-the-user access, 2012.11.01.~2015.10.31., 3.97 million euro)

Coordinator: Scuola Superiore di Studi Universitari e di Perfezionamento Sant'anna (이탈리아)

Participants: Ericsson AB(스웨덴), OPTRONICS Technologies A.B.E.T.E.(그리스), III V LAB GIE(프랑스), Promax Electronica S.L.(스페인), British Telecommunications

Public Limited Company(영국), Uvibersitat Politecnica de Catalunya(스페인), Research and Education Laboratory in Information Technologies(그리스)

10G mobile back-haul

Time/wavelength assignment function

OLT ONU

EU FP 연구동향

36

목표: Clean-state 접근법에 의한 Common PHY Infrastructure를 갖는 네트워크 구조 및 대역폭 자원의 유연성 제공 연구

핵심기술: Long-reach access 기술, Flat optical core(=OEO 및 Electronics 절감) 기술, 네트워크 자원 공유 기술, 에너지-저감의 유무선 네트워크 통합 기술 연구

EU FP DISCUS 연구동향 DISCUS (The DIStributed Core for unlimited bandwidth supply for all Users and Services, 2012.11.01.~2015.10.31., 11.65 million euro)

Coordinator: The College of The Holy & Undivided Trinity of Queen Elizabeth near Dublin(아일랜드)

Participants: Interuniversitair Micro-Electronica Centrum Vzw(벨기에), University College Cork, National University of Ireland, Cork(아일랜드), III V LAB(프랑스), Polatis

Ltd(영국), Alcatel-Lucent Deutschland AG (독일), Telecom Italia S.P.A(이탈리아), Coriant R&D GMBH(독일), Atesio GMBH(독일), Kungliga Tekniska Hoegskolan(스웨덴),

Aston University(영국), Telefonica Investigacion y Desarrollo SA(스페인)

<DISCUS architecture> <CO-metro network bypass>

EU FP 연구동향

37

목표: QoE 향상 및 비용-/에너지-저감을 제공하는 Multi-operator FMC 기술

핵심기술: 네트워크 플랫폼 제어 기술, 네트워크 동기 기술, 무선 셀 핸드오버 지원 기술, 유무선 자원 통합 제어 기술 연구

EU FP COMBO 연구동향 COMBO (COnvergence of fixed and Mobile BrOadband access/aggregation networks, 2013.01.01.~2015.12.31., 11.17 million euro)

Coordinator: JCP-Consult SAS (프랑스)

Participants: DOCOMO Communications Lab. EU GMBH(독일), France Telecom SA(프랑스), Centre Tecnologic de Telecommunicacions de Catalunya(스페인), Adva Ag

Optical Networking(독일), Fon Wireless Ltd(영국), Aitia International Informatikai Zartkoruen Mukodo RT(헝가리), Telefonica Investigacion y Desarrollo SA(스페인), Deutsche

Telekom AG(독일), Adva Optical Networking Limited(영국), Lunds Universitet(스웨덴), Alcatel-Lucent Italia S.P.A.(이탈리아), Ericsson AB(스웨덴), Budapesti Muszaki es

Gazdasagtudomanyi Egyetem(헝가리), Institut Mines-Telecom(프랑스), Politecnico di Milano(이탈리아), Telnet Redes Inteligentes SA(스페인)

<COMBO project concept> <COMBO technical approach>

EU FP 연구동향

38

IV. NG-PON3 전망3 전망 및 후보 기

39

광 가입자망 기술 표준화

NG-PON2 표준 제정 완료에 따라 후속 기술에 대한 기술백서 작성 ’15년 하반기 착수 예정 백서 작업에 이어 후속 기술(가칭 NG-PON3)에 대한 표준화 착수(’16년 하반기~’17년 상반기)

40

NG-PON3 필요성-표준화 관점

Joint ITU/IEEE Workshop on Ethernet(Sept. 2012)

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NG-PON3 요구사항 Optical access being residential users dominated is more driven by

Higher performance

Lower OPEX, Lower cost

Higher speed (with higher bandwidth)

Longer reach

Lower power consumption

NG-PON3 will be introduced:

Wavelength flexibility appears as a limiting factor for deployment

To simply wavelength spectrum allocation (co-existence)

To achieve a green efficiency (NG-PON3 could be developed due to strict power consumption figures)

To achieve versatile customer (high rate and low cost ONU)

‘OTh3A.7, OFC 2013’ is working on FDM PON with Photonics Silicon devices to enlighten the future of PON:

Only 2 wavelength (one Up and one Down)

Co-existence of high and low bit rate ONUs

Source: “Post NG-PON2…”: Can the spectrum be exploited more intensively in PON’s?, OFC workshop on NG access, 2013.

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Key Elements for NG-PON3 Transmitter at OLT

Monolithic / Hybrid Photonics Integrated Circuit (PIC) / CMOS / Array Optics

Novel packaging

Provides small size and power consumption, cost advantage

Dispersion and non-linearity in fiber is no longer negligible at higher line rate

Receiver at ONU

Monolithic / Hybrid Photonics Integrated Circuit (PIC) / CMOS / Array Optics

Increased sensitivity with PON BW

EDC needed

APD and power control are already used in 10G PON

High-speed FEC is unavoidable -> latency

High-speed RF electronics increase complexity, power and cost.

Other remedies

Use optical amplifier to improve sensitivity

Is it worth the complexity to go to coherent transceiver techniques?

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맺음말

NG-PON2 표준화는 ’15년 상반기에 완료 예정이며, 시장 형성 전망

액세스망은 고속화, 광역화, 유무선 융합 방향으로 기술의 진화

이동통신의 유선구간 (프론트홀)을 수용하는 통합 플랫폼으로 진화

OLT와 DU의 통합 플랫폼

Legacy PON 수용하는 하이브리드 플랫폼

SDN 기반 액세스망 기술로 진화

망 신뢰도를 높이기 위한 가상화, 지능화, 유연화

CapEx, OpEx 절감