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 OLT ONU Local Exchange Home/business 20km x32 1 to Rx 1 AWG 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 AWGs. –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 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 S-band device C-band device

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

Temperature performance:25C vs 50C

Return path loss capability versus temperature

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