next generation optical amplifier for 10 ’ s of tera-bps data transmission
DESCRIPTION
Next Generation Optical Amplifier for 10 ’ s of Tera-bps Data Transmission. National Research Laboratory. Ultra-Wideband Optical Amplifier. Optical Communication Systems Lab. Seoul National University http://stargate.snu.ac.kr. SNU Optical Communication Systems Lab. KJIST - PowerPoint PPT PresentationTRANSCRIPT
Next Generation Optical Amplifier for Next Generation Optical Amplifier for 10’s of Tera-bps Data Transmission10’s of Tera-bps Data Transmission
Optical Communication Systems Lab.
Seoul National University
http://stargate.snu.ac.kr
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
National Research Laboratory Ultra-Wideband Optical Amplifier
2
National Research Laboratory Ultra-Wideband Optical Amplifier
Outline
Background History of Transmission Capacity Expansion Why WDM ? Why Ultra-Wideband Optical Amplifiers ? Market Aspects / Relation to Other Technologies Building blocks for Optical Amplifier
Technologies / Team potential Approach 1 : WEDFA Approach 2 : TDFA Approach 3 : Raman amplifier Approach 4 : Specialty fiber
Team profile / Approach / Goal
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
3
National Research Laboratory Ultra-Wideband Optical Amplifier
History of Transmission Capacity Expansion
AT&T10 Year Plans Did Not Give Sufficient Capacity
!! Always Beyond Expectation !!!! Always Beyond Expectation !!
Gb
/s
0.1
1
10 1
10 2
10 3
1980 1990 2000 20101970
1900 1950 2000 Yr1850
BL
(bp
s*k
m)
1
10 12
10 9
10 6
10 3
10 15
Telegraph
Telephone
Coax
MW
Lightwave
EDFA
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
4
National Research Laboratory Ultra-Wideband Optical Amplifier
Why WDM ?
FiberFiberFiberFiber
MUXLasers Detectors
AmplifierAmplifier
# of
WD
M c
han
nel
s
Bit rate per channel (Gbps)
10.1 1 10 100 1000
10 4
10 3
10 2
10Yr 96 - 97
WDM
1 Tbps
Yr 98 - 99
Yr 99 : 40G x 40chRaman Amp
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
5
National Research Laboratory Ultra-Wideband Optical Amplifier
Why Ultra-Wideband Optical Amplifier ?
Until the beginning of 1998, less than 10 published papers on Wideband EDFA
NTT 35nm 1450 - 1485nm Thulium 1998 NTT 37nm 1300nm region Praseodymium PCE < 20% 1998 NTT 75nm 1531 - 1606nm EDFA & Raman 1998 NTT 50nm 1460 - 1510nm TDFA & Raman 1999 NTT 110nm C & L plus Thulium PCE < 15% 1999 SNU 80nm 1530 - 1610nm C & L PCE > 27% 1999 Tyco 100nm formerly AT&T Raman Multi-pump 1999
Year 1999, Lucent Technology started to hire optical engineers for Raman Amplifier Development Year 2000, Raman amplifier became a preliminary product : Major effort by Majors
Silica-Er C+L band
Other Rare Earth
Raman Amplifier Raman Pump
RE Pump
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
6
National Research Laboratory Ultra-Wideband Optical Amplifier
Market Aspects / Relation to Other Technologies
실리카 계열 EDFA (WEDFA)
광섬유 Raman 증폭기
다른 희토류 이온을 첨가한 증폭기
A. 세계 시장 규모 ($)<초광대역 광 증폭기 >2000 년 :12 억 2005 년 : 32 억 +<광전송 장비 >2000 년 :40 억 2005 년 :120 억
B. 추가 광선로 포설 비용(km 당 3 억원 ) 절감
광전송 장비 / 기술 수출
기간망 구축 비용 절감
통신 수요의 안정적 공급
차세대
반도체 레이저수동광소자 특수광섬유
핵심기술
소자 기술
초광대역 광증폭기
대용량 전송 시스템
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
7
National Research Laboratory Ultra-Wideband Optical Amplifier
Building Blocks for Optical Amplifier
1400 1450 1500 1550 1600 1650-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
Gain
co
effi
cie
nt(
m-1)
Wavelength(nm)
Pump LD
Pump LD Pump LD
C band
L band
C + L C + L
Sub - optical components
Laser diode / photo diodeSpecialty FiberOptical IsolatorOptical coupler
AWG / FBGSpectral filters
Also a fundamental module for optical transmission system
Market price ~ 30K$since 1991
while..Component price dropped to
1/20 since 1991
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
8
National Research Laboratory Ultra-Wideband Optical Amplifier
WEDFA
1500 1520 1540 1560 1580 1600 1620 1640-50
-40
-30
-20
-10
0
10
20
L bandC bandOp
tic
al
Po
we
r (
dB
m)
W avelength (nm)
IEEE Photonics Technology Letters, vol. 12, May to be printed, 2000, 5 Wideband EDFA Patent (international) OSA Applied Optics, vol. 39, no. 7, pp. 1118-1120 2000, 4 EDFA sensor IEEE Photonics Technology Letters, vol. 12, pp. 329-331, 2000, 3 Wideband EDFA IEE Electronics Letters, vol. 35, pp. 1099-1100 1999, 6 Wideband EDFA OSA Applied Optics, vol. 38, pp. 2749-2751 1999, 5 EDFA sensor IEEE Photonics Technology Letters, vol. 11, pp. 316-318, 1999, 3 EDFA dynamics OSA Optics Letters, vol. 24, pp. 279-281, 1999, 3 Wideband EDFA Patent (international) IEEE Photonics Technology Letters, vol. 11, pp. 42-44, 1999, 1 Wideband EDFA Patent (international) IEEE Photonics Technology Letters, vol. 10, pp. 1721-1723, 1998, 12 WDM EDFA Patent (international) IEEE Photonics Technology Letters, vol. 10, pp. 1168-1170, 1998, 8 WDM EDFA Patent (international) IEEE Photonics Technology Letters, vol. 10, pp. 790-792, 1998, 6 WDM EDFA
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
9
National Research Laboratory Ultra-Wideband Optical Amplifier
TDFA
1450-1520nm band can be utilized using TDFA and GS-TDFA Low loss region in optical fiber Not seriously explored until recent years We developed numerical model for TDFA for the first time (6 months of research)
Pump laser require specialty fiber (double clad, Yb doped fibers) Amplifier, pump laser, and fiber design require extensive numerical analysis
3H6
3F4
3H5
3H4
3F3
3F2
1G4
Pump Signal & ASE0
1
3
2
4
5Level
P1
P2
P3
1.47m Signal band
0.8m band ASE
1.8m band ASE
1450 1460 1470 1480 1490-40
-30
-20
-10
0
10
Gain &
NF
(dB)
Ou
tpu
t P
ow
er
(dB
m)
Wavelength (nm)
0
5
10
15
20
25
30
NF
Gain
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
10
National Research Laboratory Ultra-Wideband Optical Amplifier
Raman
Outperformthe most recent resultsfrom Tyco Submarine
(Simulation, May 1999)
plus
Derivation of new equation set for the much faster numerical analysis(IEEE PTL 2000)
1400 1450 1500 1550 1600
5
6
7
8
NF
(d
B)
Wavelength (nm)
1400 1450 1500 1550 16000
2
4
6
8
10
98nm 1dB bandwidth
Ga
in (
dB
)
0 5 10 15 20 250
50
100
150
Pu
mp
po
wer (
mW
)
Distance (km)
Amplifier dynamics based on nonlinearity in optical fiber (specialty fiber required) Each pump provides approximately 25 - 30nm of gain bandwidth Gain bandwidth, wavelength selectable with appropriate pumps
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
11
National Research Laboratory Ultra-Wideband Optical Amplifier
Specialty Fiber : TDFA
ESA at 980 nm
PIQ at 1.55 m
980 nm
1550 nm1800 nm
1450 nm
Er3+Tm3+
OSA, Advanced Solid State Lasers, paper MB15 1999 , 1 EDF laser Optics Letters in preparation ASE source
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
12
National Research Laboratory Ultra-Wideband Optical Amplifier
Specialty Fiber : pump
ErSm
1530nm 980nm
Pow
er D
ensi
ty
core
cladding
0
100
200
300
400
500
Sm
Ab
sorp
tion
(d
B/K
m)
1000 1200 1400 1600 18000.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
*1000Er
Flu
ores
cen
ce
wavelength, nm
ErSm
IEEE Journal of lightwave technology, accepted 1999 Fiber Stress Journal of Optics B: Quant. Semiclassic. Optics, accepted 1999 Hollow Fiber Journal of Non-crystalline Solids, accepted 1999 Erbium Fiber Journal of Non-crystalline Solids, accepted 1999 Erbium Fiber Optics Communications, Vol. 161, 25 1999 Hollow fiber Optics Communications, Vol. 159/1-3, 139 1999 Dispersion IEE Electronics Letters, Vol. 34, No. 19, pp1852-1853 1998 Annular EDF IEEE Journal of Lightwave Technology, Vol. 16, 285 1998 Fiber Coating
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
13
National Research Laboratory Ultra-Wideband Optical Amplifier
Approach / Goal
Amplifier structure SimulationFiber, pump structure SNUSNU Amplifier TestTransmission penalty Integration
Tm, Ho, Yb, Nd doping SpectroscopyHeavy metal silica fiber KJISTKJIST ManufacturabilityDouble clad pump fiber Co-doping
WEDFASNU / Lucent
RamanSNU / Southampton
RE-DFAKJIST / Brown
Who could tell us about the target ? We can’t ..well, modest target will be 150nm bandwidth optical amplifier ..
Rather, we promise that we will be keep staying Rather, we promise that we will be keep staying as one of the world leaders !as one of the world leaders !
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab
14
National Research Laboratory Ultra-Wideband Optical Amplifier
Reminder : How much bandwidth?
Current technology cover only 10% of usable bandwidth
Nortel working on 100 Tera bps Ethernet routerLucent / JDS / Cronos / Xros working on 1000 x 1000 WDM channel optical switch
Lucent / Nortel / Corning / NEC working on Ultra-wideband amplifier
wherever the technology goes, we will trace, and will keep staying at the competitive edge
Wavelength (nm)1300 1400 1500 16000.0
0.1
0.2
0.3
0.4
Los
s (d
B/k
m)
SMF
C-EDFA L-EDFA
GS-TDFAS + -TDFA
Raman-Amp
WEDFA
TDFAs
OH-free Fiber
0. 3 dB / km fiber loss
KJISTFiber Optics Research Lab
SNUOptical Communication Systems Lab