High performance simple differential transimpedance amplifier for detecting high-frequency weak optical signals

This paper proposes a differential transimpedance amplifier (TIA) with low noise, low cost, high sensitivity and a simple structure. The TIA requires only one op-amp for differential amplification, eliminating the DC bias and common-mode noise, which is suitable for detecting high-frequency weak optical signals. The gain bandwidth product of the TIA is approximately 140 (GHz*Ω) with a single AD8065 op-amp and approximately 600 (GHz*Ω) with a single OPA847 op-amp. This paper also shows the specific application of the TIA in the fiber optic gyro, which can effectively suppress the relative intensity noise (RIN) of the light source and improve the detection accuracy of the fiber optic gyro.