Improved design of tuned optical receivers |
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Authors: | Jacobsen G Kan JX Garrett I |
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Affiliation: | Telecommunications Research Laboratory, Copenhagen, Denmark; |
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Abstract: | We present new design principles for improved heterodyne tuned optical receivers where several tuning inductances reduce the influence of thermal receiver noise over a broad frequency range. A theoretical example for a 600 MHz tuning bandwidth shows a reduction of thermal receiver noise (and thus in required local oscillator power) of up to 13dB. The example is tested experimentally for the so-called mixed tuning configuration. We obtain good agreement with the theoretical predictions. The experimental RMS noise current is <5pA/?(Hz) over a 580 MHz bandwidth with the lowest value of 3-5 pA/?(Hz) at 950MHz. |
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