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  • Panasonic Develops High-Speed VSCEL
Jun 2005
OSAKA, Japan, June 6 -- Panasonic, the brand by which Matsushita Electric Industrial Co. Ltd. is primarily known, announced it has developed a 850-nm AlGaAs/GaAs VCSEL (vertical cavity surface-emitting laser) capable of high-speed 12.5 Gb/s modulation with a low, 8 mA operating current. It said the laser will be used for low-cost optical communication such as plastic fiber communication and spatial light transmission.

To enable high-speed operation of a laser, its parasitic capacitance must be reduced. Panasonic said the new VCSEL uses BCB (benzocyclobutene) resin with a low dielectric constant formed around the light-emitting post structure.

"This structure hugely reduces the parasitic capacitance to less than one third of the conventional value, from 0.7 pF to 0.2 pF," the company said in a statement. "This has doubled the modulation bandwidth previously limited by the parasitic capacitance, realizing the world's highest data transmission rate of 12.5 Gb/s with 12-GHz relaxation oscillation frequency."

It said optimizing the device structure with current confinement via selective oxidation resulted in a low threshold current of 1 mA and a high slope efficiency of 1.1 W/A, and 8 mA for 12.5 Gb/s modulation.

Panasonic said it hopes to begin shipping the two types of surface-emitting lasers (2.5 Gb/s and 12.5 Gb/s) in early 2006, and that it has filed patents for 40 domestic and nine international patents. It presented research and development results at CLEO 2005, held last week in Baltimore.

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