Pulse Repetition Frequency Multiplication With Spectral Selection in Fabry–Perot Filters

Energy-Efficient Optical Pulse Multiplication and Shaping Based on a Triply Sampled Filter Utilizing a Fiber Bragg Grating

“…Notably, two independent and small sets of free parameters, i.e., α m and β m in Eqs. (6) and (7), respectively, have been optimized instead of simultaneously optimizing one set with a large number of parameters, as in our previous method [16]. With this doubly sampled method, the channel number of the sampling function can be readily increased, thus obtaining a pulse train with a high repetition rate (greater than one hundred) as well as high energy efficiency.…”

“…To relate these functions to those described in Eqs. (6) and (7), the phase terms γ m are free parameters that must be optimally selected so that all values of |a 3 (ω)| are approximately equal to unity. The output in frequency domain can thus be expressed as…”

“…3(c) shows the impulse response of sampling functionH 1 , in which a comb including nine identical channels (delta functions) with time interval of 1000/9 ps is successfully obtained, and the in-band energy (diffraction) efficiency is 100%, which is exactly the same as expected from Eq. (6). For the 25-channel sampling function, the optimal results are shown in Fig.…”

All‐optical pulse repetition frequency divider utilizing an injection‐unlocked Fabry‐Perot laser diode

“…In optical domain, the control of optical pulses' repetition frequency is necessary and important by external devices instead of replacing or tuning the optical pulse source. Several methods of pulse repetition frequency multiplication of optical pulses have been proposed [4, 5], because high speed optical pulse train is critical to some significant applications, such as large capacity optical communication systems, and ultrafast data processing. However, many other applications, such as optical sampling and photonic analog‐to‐digital converter, may need low‐repetition‐frequency optical pulses [6].…”

Multi-channel 160-GHz pulse generator using a 40-GHz phase modulator and two stages of PM fiber

“…In general, mode-locked lasers are not considered low-cost elements. Other published methods include: tunable-rate pulse generation using a specially designed dual-wavelength DFB laser diodes [3]; the rate multiplication process through the temporal fractional Talbot effect of chirped pulses [4]; and spectral selection by arrayed waveguide gratings [5], where each burst of pulses lies at different wavelength; using spectral selection by a Fabry-Perot (FP) optical filter to multiply 10 GHz pulse train to 40 GHz, which needs either high finesse or additional components such as semiconductor optical amplifiers [6].…”