A 4 Gb/s 2-Level to 2 Gsymbol/s 4-Level Converter GaAs IC for Semiconductor Optical Amplifier QPSK Modulators
نویسنده
چکیده
The design of a 50 0 impedance matched two-tofour level converter GaAs IC for two-electrode semiconductor optical amplifier (SOA) modulators is presented. The designed IC exhibits eye diagrams with eye openings of better than 0.30 V and a spacing between adjacent output signal levels of 0.33 V for output symbol rates of up to 2 Gsym.boVs corresponding to input bit rates of up to 4 Gb/s. A novel differential super buffer output driver is applied, for which output reflection coefficients IS221 of less than -12 dB for frequencies up to 10 GHz are obtained. A 1 Gb/s optical QPSK microwave link transmission experiment using a packaged sample of the designed IC and a two-electrode semiconductor optical amplifier phase modulator has been conducted.
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