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High Performance Polarisation Independent RSOAs in the S,C and L Bands. S.Karagiannopoulos, A. E. Kelly , C. Michie, C. Tombling, W. I. Madden, I. Andonovic. Outline. Motivation Parametric performance System performance Comparison with C/L band device Extinction ratio - PowerPoint PPT Presentation
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High Performance Polarisation Independent RSOAs in the S,C and L
Bands
S.Karagiannopoulos, A. E. Kelly, C.Michie, C. Tombling, W. I. Madden, I. Andonovic
Outline
• Motivation• Parametric performance• System performance• Comparison with C/L band device• Extinction ratio• Temperature performance• Conclusions
WDM-PON system
Tx 1
Tx 32
Rx 33
Rx 64
R-SOA@33
OLTONU
Local Exchange Home/business20km
x321 to 64
1+ Rx 1AWG
Tx 33
Tx
RSOA wavelengths…
• Can do upstream and downstream using a single wavelength via data stripping and remodulation.– System compromises required– Very high spec RSOA
• Can use different bands for upstream and downstream and cyclic nature of AWG’s.– Need filtering at ONT
• Increase number of users for given wavelength spacing
Design
• InP:InGaAsP• Buried Heterostructure• Lateral Waveguide
Tapers• Tensile Bulk• 0.88 and AR coatings
TO-packaged S-band RSOA parametric TO-packaged S-band RSOA parametric teststests
• Standard tests at 25ºC and 80mA
RSOA modulation experimentsRSOA modulation experiments
• TO packaged devices on ETS evaluation board• 50mA DC bias, 60mA modulation • S band RSOA, CW injection at 1465 – 1530nm• Stage temperature 25°C• Modulation at 1.25 Gbps data rate with 2^11-1 PRBS bit pattern.• The RX consists of an APD photoreceiver and a 10GHz limiting
amplifier
Sensitivity, Output Power, Gain and Path Loss Sensitivity, Output Power, Gain and Path Loss Capability at 1490nm and 25Capability at 1490nm and 25ºCºC
• ~30dB return path loss capability at -20dBm input
Sensitivity, Output Power, Gain and Path Loss Sensitivity, Output Power, Gain and Path Loss Capability at 1580nm and 25Capability at 1580nm and 25ºCºC
Sensitivity, Output Power, Gain and PLC Sensitivity, Output Power, Gain and PLC versus Wavelength at 25versus Wavelength at 25ºCºC
• -20dBm CW input power and 25ºC stage temperature• Eye diagram at 1490nm
S, C and L band performance
S-band device C-band device
-40
-30
-20
-10
0
10
20
30
40
1440 1460 1480 1500 1520 1540 1560 1580 1600 1620 1640
Wavelength (nm)
Sens
itivi
ty(d
Bm
),Pou
t(dB
m),
PLC
(dB
),Gai
n(dB
)SensPoutGainPLC
Extinction ratio versus wavelength
Gain versus Current for the S-Band RSOAGain versus Current for the S-Band RSOA
• Measured with lensed fibre(~2dB coupling efficiency)• Band filling effects explain in part the wavelength dependence of the extinction ratio
Extinction ratio analysis
0
2
4
6
8
10
12
14
16
1460 1470 1480 1490 1500 1510 1520 1530 1540
Wavelength, nm
Extin
ction
Rati
o, d
B
ER estimated
ER measured
Temperature performance:25C vs 50C
0
5
10
15
20
25
30
35
40
-40 -30 -20 -10 0
Seed Power into the RSOA (dBm)
Gai
n, d
B /
Pat
h Lo
ss C
apab
ility
, dB
-35
-30
-25
-20
-15
-10
-5
0
5
10
Sen
sitiv
ity, d
Bm
/ P
out,
dBm
Gain/25ºCGain/50ºCPLC/25ºCPLC/50ºCPout/25ºCPout/50ºCSens/25ºCSens/50ºC
Return path loss capability versus temperature
15
17
19
21
23
25
27
29
31
33
35
20 30 40 50 60 70 80
RSOA Case Temperature, C
PLC
, dB
`
Summary• TO packaged polarisation insensitive S,C& L band
RSOA • ~1dB penalty at 1.25Gbit/s compared to
commercial M-Z modulator• >25dB upstream PLC over 60nm at -20dBm input• In tandem with C/L band device allows operation
over a 120nm bandwidth• Temperature performance shows operation up to
~70C– Higher performance required….
A E Kelly, C Michie, Wende Zhong, S Karagianopoulos, W I Madden, C Tombling, I Andonovic, ‘High Performance Polarisation Independent Reflective Semiconductor Optical Amplifiers in the S, C and L bands’, IEEE Journal on Selected Areas in Communications, vol. 28, no. 6, August 2010
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