Merging their respective engineering strengths in laser diode technologies, Nichia and Sony have successfully developed an integrated, dual wavelength laser coupler compatible with red and blue-violet lasers.
The two companies have been working on the co-development of the blue-violet laser diode for recording and playback on optical discs since June 2002. In April 2004, they signed a cross license agreement that led to the mutual use of relevant patents owned by the two companies.
The dual wavelength laser coupler itself is a single integrated device with a red laser (660nm wavelength) for DVD playback and blue-violet laser (405nm wavelength) for blue-violet optical disc playback.
In the past, in conventional DVD/blue-violet laser optical disc systems, the laser diode and optical receiver parts corresponding to each wavelength were independent.
But the new dual wavelength laser coupler incorporates the two in a single element, allowing designers to build a simplified, smaller system with enhanced reliability.
Mass production of the new coupling devices is scheduled to start by the end of 2005.