Kyoung Soo Kwon

Triple wavelength OEIC with improved optical responsivity

OEICs for the advanced optical storage systems are required to be compatible with three kinds of disk systems, CD (λ=780nm), DVD (λ=650nm) and bluray disk (λ=405nm). In this paper we present a triple wavelength OEIC with improved isolation areas between adjacent photodiodes, which minimize the dark areas for 405nm laser beam and also improve the effective photodiode areas for 650nm and 780nm laser beams. The isolation area is made not with pwell and pbur layer but with floated p+ for increasing the resistance between adjacent photodiodes. The IC was developed in 0.6um BiCMOS technology with integrated N+ finger type photodiodes. A 3-dB frequency response of 163MHz and a sensitivity of 22mV/uW at the blue laser spectral range (405nm) have been measured. A power consumption of 115mW at 5V supply is low enough for the commercial bluray pickup unit, and a chip area of 2.88mm2 is achieved. We have got good jitter performance of 6.8% at the commercial bluray systems.

High speed OEIC for advanced optical storage

In optical storage systems, the demand for fast optoelectronic integrated circuit (OEIC) is dramatically increasing especially in the blue spectral range (λ=405nm). A new OEIC for the blue spectral range, which is integrated monolithically with the 0.6μm BiCMOS circuit, is presented in this paper. Proposed OEIC is optimized with respect to bandwidth, sensitivity, and noise in order to achieve high S/N ratio. N+ Finger/Nepi/PBL/Psub photodiodeachieves a responsivity of 0.31A/W at blue range corresponding to a quantumefficiency η of 95% [with Optimized ARC for blue range], afrequency response of 450MHz and a rising/falling time of 0.578ns. 3dB frequency response of 204MHz and noise of -91.8dBm [1~120MHz @ RBW=30 KHz] are obtained for the fast channel amplifier. Jitter value of 5.1% is achieved compared to the commercial OEIC of 5.4%.