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Performance of fiber-optic data links using 670-nm cw VCSELs and a monolithic Si photodetector and CMOS preamplifier

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Abstract

To be competitive with copper technology for links and bus applications, optoelectronics must be made affordable. One means of achieving a low-cost optoelectronics link is to adapt volume-manufactured components. This may imply CMOS optoelectronic integrated circuits (OEICs), which are driven by the huge CMOS IC volumes and red laser diodes, which are driven by the consumer and storage markets. In this paper we demonstrate a potential low-cost link using a monolithic Si photodiode and preamplifier, multimode fiber, and red vertical-cavity surface-emitting lasers (VCSELs). The monolithic receivers are advantageous because of the reduced packaging costs and increased reliability. Multimode fiber (either large- core glass or plastic) is an affordable solution for short-distance links for which modal dispersion is insignificant. The red VCSEL is attractive for its potential low cost due to wafer-level testing and for its ease of packaging and handling. In addition, the red VCSEL is more attractive than red edge-emitting lasers because of a lower threshold current and hig;her fiber-coupling efficiency. This paper describes the performance of a short data link at 622.08 Mbit/s (STM-4) using these low-cost technologies for what we believe to be the first time.

© 1994 Optical Society of America

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