Modulator driver SA1137 supports clock rates from 9.9 to 12.4 Gbits/sec. With 25 psec rise and fall times, 5% crossover distortion, 10% over/undershoot, and a 3- to 8-Vpk-pk output, this amplifier is suitable for driving LiNbO3 modulators. Operating features include integral optical-modulator DC bias, output control voltage detector, reference voltage, output level control (gain), and crossover adjustment. Operating over the temperature range of -5 to +75°C, the unit requires +11 V at 300 mA and -5 V at 25 mA with input level of 600 to 900 mVpk-pk.We tested samples with JDS 10Gb optic modulator P/N: 10024546 using 1.3GHz sine signal generator, 1.3GHz digital scope, and BCP O/E convertor. Comparing with JDS H301-1210 modulator driver, it is more like limiting amplifier and can give high RF output. It also offers Bias-tee function.The pdf datasheet link below for SA1137-2 should also work for SA1137-2A. We have sold many SA1137-2A over more than one year without any problem.