Acta Optica Sinica, Volume. 25, Issue 11, 1497(2005)
Measurement System of Ultra-Wideband Frequency Response Based on Optical Heterodyne Technique
An ultra-wideband frequency response measurement system for optoelectronic devices has been established using the optical heterodyne detection method utilizing a tunable laser and wavelength-fixed distributed feedback-laser diode. By controlling the laser diode cavity length, the beat frequency is swept from DC to beyond 100 GHz, and ultra-wideband frequency response character can be measured without using any high-speed light modulation source and additional calibration. This is the major advantage of this method. In the measurement, two InGaAs p-i-n detectors have been tested, and their 3 dB bandwidths are 14.4 GHz and 40 GHz, respectively. Experiments show that this method is accurate and easy to carry out. Finally, several suggestions for improving measurement accuracy are given.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. Measurement System of Ultra-Wideband Frequency Response Based on Optical Heterodyne Technique[J]. Acta Optica Sinica, 2005, 25(11): 1497