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
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•
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•
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Motivation
Parametric performance
System performance
Comparison with C/L band device
Extinction ratio
Temperature performance
Conclusions
WDM-PON system
Local Exchange
Home/business
20km
AWG
OLT
Tx l1
ONU
l1+l33
l1 to 64
x32
Tx l32
Rx l33
Rx l64
Tx l33
Tx l64
Rx l1
R-SOA@l33
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
tests
• Standard tests at 25ºC and 80mA
RSOA modulation experiments
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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
Capability at 1490nm and 25ºC
• ~30dB return path loss capability at -20dBm input
Sensitivity, Output Power, Gain and Path Loss
Capability at 1580nm and 25ºC
Sensitivity, Output Power, Gain and PLC
versus Wavelength at 25ºC
• -20dBm CW input power and 25ºC stage temperature
• Eye diagram at 1490nm
S, C and L band performance
40
S e n s itiv ity (d B m ),P o u t(d B m ),
P L C (d B ),G a in (d B )
S-band device
C-band device
30
Sens
Pout
G a in
PLC
20
10
0
-1 0
-2 0
-3 0
-4 0
1440
1460
1480
1500
1520
1540
1560
W a ve le n g th (n m )
1580
1600
1620
1640
Extinction ratio versus wavelength
Gain 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
16
ER estimated
14
ER measured
Extinction Ratio, dB
12
10
8
6
4
2
0
1460
1470
1480
1490
1500
Wavelength, nm
1510
1520
1530
1540
40
10
35
5
0
30
-5
25
-10
20
-15
15
-20
10
-25
5
-30
0
-35
-40
-30
-20
-10
Seed Power into the RSOA (dBm)
0
Sensitivity, dBm / Pout, dBm
Gain, dB / Path Loss Capability, dB
Temperature performance:25C vs 50C
Gain/25ºC
Gain/50ºC
PLC/25ºC
PLC/50ºC
Pout/25ºC
Pout/50ºC
Sens/25ºC
Sens/50ºC
Return path loss capability versus
temperature
35
33
31
PLC, dB
29
27
25
23
`
21
19
17
15
20
30
40
50
60
RSOA Case Temperature, C
70
80
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