초록 ▼

An optical homodyne receiver is realized by employing two separate signal amplification paths in a balanced receiver configuration. Specifically, the relative phase difference between a received optical signal and a local oscillator signal is extracted from nodes which, from the point of view of an

An optical homodyne receiver is realized by employing two separate signal amplification paths in a balanced receiver configuration. Specifically, the relative phase difference between a received optical signal and a local oscillator signal is extracted from nodes which, from the point of view of an amplifier extracting a data component signal, are at ac ground. This approach permits a phase detector amplifier, which extracts the relative phase component, to be dc coupled in addition to having a higher transimpedance for lower thermal noise, and thus higher sensitivity. Additionally, by extracting the data and phase component signals at different points in a balanced receiver configuration, the data and phase amplifiers can be separately engineered for optimum performance.

대표청구항 ▼

An optical homodyne receiver comprising: first and second photodetectors responsive to first and second optical signals, respectively, said first photodetector connected between first and second terminals, said second photodetector connected between a third terminal and said second terminal, said fi

An optical homodyne receiver comprising: first and second photodetectors responsive to first and second optical signals, respectively, said first photodetector connected between first and second terminals, said second photodetector connected between a third terminal and said second terminal, said first optical signal comprising the electrical-field sum of a local oscillator signal and a received optical signal, and said second optical signal comprising the electrical-field difference between said local oscillator signal and said received optical signal; means, for detecting a data component of said received optical signal, electrically connected to said second terminal; and means, for detecting the relative phase difference between said received optical signal and said local oscillator signal, electrically connected across said first and third terminals.