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3 February 2009 A single comb laser source for short reach WDM interconnects
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High-channel-count WDM will eventually be used for short reach optical interconnects since it maximizes link bandwidth and efficiency. An impediment to adoption is the fact that each WDM wavelength currently requires its own DFB laser. The alternative is a single, multi-wavelength laser, but noise, size and/or expense make existing options impractical. In contrast, a new low-noise, diode comb laser based on InAs/GaAs quantum dots provides a practical and timely alternative, albeit in the O-band. Samples are being evaluated in short reach WDM development systems. Tests show this type of Fabry-Perot laser permits >10 Gb/s error-free modulation of 10 to over 50 separate channels, as well as potential for 1.25 Gb/s direct modulation. The paper describes comb laser requirements, noise measurements for external and direct modulation, O-band issues, transmitter photonic circuitry and components, future CMP applications, and optical couplers that may help drive down packaging costs to below a dollar.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gregory L. Wojcik, Dongliang Yin, Alexey R. Kovsh, Alexey E. Gubenko, Igor L. Krestnikov, Sergey S. Mikhrin, Daniil A. Livshits, David A. Fattal, Marco Fiorentino, and Raymond G. Beausoleil "A single comb laser source for short reach WDM interconnects", Proc. SPIE 7230, Novel In-Plane Semiconductor Lasers VIII, 72300M (3 February 2009);

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