Abstract
The digital versatile disk (DVD) has been increasingly prevalent for high-density data storage and readout applications. To meet the requirements of being able to read not only the DVD signals but also the signals from the traditional compact disc (CD), the conventional DVD pickup heads are typically equipped with two separate laser diodes with wavelengths at 650 nm and 780 nm for DVD and CD read-out respectively.1 It would be most desirable and advantageous to integrate two separate lasers into one single chip that can allow the reduction of the optical components, the pick-up head size, the assembling time, and the over-all costs.2
© 2001 Optical Society of America
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