A new method for measuring time-resolved frequency chirp of high bit rate sources

Time resolved chirp measurements of gain switched semiconductor laser using a polarization based optical differentiator

“…In comparison with other techniques for the characterization of TRC [9][10][11][12][13][14], our procedure is very simple avoiding time consuming sensitive adjustments. In fact, our technique is similar to the discriminator technique proposed in refs [9][10][11][12], which are also based on the measurement of the temporal intensities after filtering the signal with different transfer functions.…”

“…In fact, our technique is similar to the discriminator technique proposed in refs [9][10][11][12], which are also based on the measurement of the temporal intensities after filtering the signal with different transfer functions. The main advantage of the PROUD method in comparison with these techniques is that the expression providing the frequency chirp takes into account not only the amplitude of the frequency response of the filter, but also its phase response, which gives rise to the term d|u(t)|/dt in Eq.…”

“…They are based on frequency discriminators [9][10][11][12], Brillouin scattering interaction [13] and spectral phase measurements [14]. Recently, Li et al [15,16] have proposed a different approach named "phase reconstruction by optical ultrafast differentiation" (PROUD).…”

Investigation of High-Speed Transient Processes and Parameter Extraction of InGaAsP Laser Diodes

“…When the bias current was modulated, the optical beam power and optical wavelength became modulated as well. The optical beam is coupled to the tapered fiber (Shani et al, 1989;Alder et al, 2000), which is connected to a Mach-Zehnder fiber interferometer (Saunders et al, 1994;Jeong & Park, 1997;Laverdiere et al, 2003). An optical amplifier can be used if the interferometer output signal is too weak.…”

Linear self-referenced complex-field characterization of fast optical signals using photonic differentiation

“…Recent demonstrations include both linear implementations of concepts previously proved with non-linear processes (e.g. spectrography [18,19] and spectral self-interferometry [20,21]) and fundamentally new linearoptics pulse measurement schemes [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38]. As compared with more conventional non-linear optics techniques, linear-optics methods offer an increased sensitivity and they can be implemented in very simple and practical (e.g.…”