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A balanced optical receiver front-end suitable for Gbit/s heterodyne detection in coherent optical communication systems is presented. The transimpedance is 70 dB Omega with +or-2 dB ripple over the passband from 2 to 4.4 GHz. The ripple was reduced to +or-0.5 dB within a passband from 2.1 to 4.4 GHz by manual tuning of the circuit. The equivalent input noise spectral density is below 4 pA/ square...
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