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Directly modulated wavelength-multiplexed integrated microring laser array

: Bennecer, A.; Williams, K.A.; Penty, R.V.; White, I.H.; Hamacher, M.; Heidrich, H.


IEEE Photonics Technology Letters 20 (2008), Nr.16, S.1411-1413
ISSN: 1041-1135
Fraunhofer HHI ()

The first demonstration of a directly modulated microring laser array is presented for ON-OFF keyed, wavelength-division-multiplexed fiber-optic data transmission. GaInAsP-InP microring resonators oscillating at separate wavelengths in the 1.5-mu m band are vertically coupled to a common passive wave-guide bus, which is fabricated on the reverse side of the InP membrane. Two microrings defined with radii for a wavelength channel separation of 6 mn have been assessed for both individual and simultaneous operation. Negligible power penalty (<0.2 dB) is observed for wavelength-division-multiplexed operation with and without transmission over a 25-km fiber span in a manner which indicates low crosstalk between the integrated sources. A device area of less than 0.12 mm(2) per microring on a common passive bus allows a highly scalable solution for short-reach wavelength-multiplexed links.