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