Short-distance Optical Interconnects Research Articles

1 Gbit/s CMOS photoreceiver with integrated detectoroperating at 850 nm

A fully integrated single-beam optical receiver is realised in a production 0.35 /spl mu/m CMOS process, which operates at 850 nm to 1 Gbit/s. The receiver integrates a photodiode, preamplifier, digital logic, and an off-chip driver. Pre-amplifier dissipation is <1.5 mW at 2.3 V, with an average optical power of -6.3 dBm required for 1 Gbit/s operation. Such a compact optical receiver may be of interest for short distance optical interconnects or local area networks.

A novel high-speed silicon MSM photodetector operating at 830 nm wavelength

A novel high-speed silicon photodetector that operates at a wavelength of 830 nm is reported. It consists of a Metal-Semiconductor-Metal (MSM) detector that is fabricated on a 5-μm thick silicon membrane. The detector has a measured -3 dB bandwidth of 3 GHz at 10 V, which is almost one order of magnitude larger than the reported bandwidth of conventional silicon MSM detectors as measured at 830 nm. The DC responsivity is 0.17 A/W, corresponding to an internal quantum efficiency of 60.5% and an external quantum efficiency of 25.4%. The large bandwidth and good responsivity at the wavelength of interest, combined with its low operating voltage and compatibility with most silicon integrated circuit technologies, make this detector a promising candidate for monolithic optoelectronic receiver circuits for use in short distance optical communication systems and computer interconnects.

Joining electronics with Olives: short-distance optical interconnects

Joining electronics with Olives: short-distance optical interconnects

Polymeric optical mixing rod coupler

Optical mixing rod couplers have been fabricated using extruded plastic tubing filled with optically transparent casting resins to form a waveguide-type mixing region. Asymmetric (1*19) splitter/combiners with plastic fiber and plastic-clad silica fiber pigtails have been made with efficiencies greater than 60% and power uniformities within 1-dB standard deviation. Tested as a combiner, the coupler had an average loss of -1.6 dB with a standard deviation of 0.71 dB. Tested as a splitter, it had an average loss of -14.9 dB with a standard deviation of 0.9 dB, and the excess loss was -2.0 dB. The results suggest that the coupler would be useful in a variety of short-distance optical interconnection applications where multimode step-index fiber is appropriate. It may also offer a higher yield than some competing, more complex techniques.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>