Widely Tunable Twin-Beam Light Source based on Quasi-Phase-Matched Optical Parametric Generator as a Spectral Responsivity Comparator between InGaAs and Si Photodiodes
نویسندگان
چکیده
We present a twin-beam light source based on quasi-phase-matched (QPM) continuous-wave (CW) optical parametric generator (OPG). The source emits collinearly the signal and the idler beams at a power level of 1 nW in wavelength ranges from 790 nm to 920 nm and from 1260 nm to 1620 nm, respectively, with a bandwidth of less than 2 nm. The quantum correlation in the OPG process can be used to directly compare the spectral responsivity of an InGaAs photodiode with that of a Si photodiode, offering a new calibration method for InGaAs photodiodes.
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