Romstad, Francis Pascal3; Birkedal, Dan4; Mørk, Jesper2; Hvam, Jørn Märcher2
1 Optoelectronics, Department of Photonics Engineering, Technical University of Denmark2 Department of Photonics Engineering, Technical University of Denmark3 IT Service, Administration, Technical University of Denmark4 Department of Micro- and Nanotechnology, Technical University of Denmark
In this letter, we propose a technique based on heterodyne detection for accurately and simultaneously measuring the amplitude and phase transfer functions of an optical modulator. The technique is used to characterize an InGaAsp multiple quantum-well electroabsorption modulator. From the measurements we derive the small-signal alpha-parameter and the time-dependent chirp for different operation conditions.
I E E E Photonics Technology Letters, 2002, Vol 14, Issue 5, p. 621-623