Matsushita Electric Develops VCSEL Laser With World's Highest Data Transmission Rate
Osaka, Japan — Panasonic, the leading brand by which Matsushita Electric Industrial Co., Ltd. is generally known, today announced the development of the 850 nm AlGaAs/GaAs VCSEL (Vertical Cavity Surface Emitting Laser) capable of high speed 12.5 Gbps modulation at low operating current of 8 mA. This laser will be used for a low-cost optical communication such as plastic fiber communication and spatial light transmission.
For high-speed operation, it is essential to reduce the parasitic capacitance in the laser. The developed VCSEL has our original planarized structure using BCB (benzocyclobutene) resin with 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. This has doubled the modulation bandwidth previously limited by the parasitic capacitance, realizing the world's highest data transmission rate of 12.5Gbps with 12 GHz relaxation oscillation frequency.
In addition, the optimization of the device structure employing current confinement by selective oxidation has realized a low threshold current of 1 mA, a high slope efficiency of 1.1 W/A that is almost three times higher than the conventional value. This has resulted in a low operating current of 8mA for 12.5Gbps modulation.
Panasonic aims to begin shipping the two types of surface emitting lasers (2.5 Gbps and 12.5 Gbps) in early 2006. Applications for forty domestic and nine international patents have been filed. These research and development results have been presented at Conference on Lasers and Electro-Optics (CLEO) 2005, held in Baltimore, U.S. from May 22 to 27, 2005.
About Matsushita Electric Industrial Co., Ltd.
Best known by its Panasonic brand name, Matsushita Electric Industrial Co., Ltd. is a worldwide leader in the development and manufacture of electronic products for a wide range of consumer, business, and industrial needs. Based in Osaka, Japan, the company recorded consolidated net sales of US$81.44 billion for the year ended March 31, 2005. The company's shares are listed on the Tokyo, Osaka, Nagoya, New York (NYSE:MC), Euronext Amsterdam and Frankfurt stock exchanges. For more information on the company and the Panasonic brand, visit the company's website at http://panasonic.co.jp/global/index.html
Source: Matsushita Electric Industrial Co., Ltd.