Sung Han Chung

Polarization Independent All-Optical Retiming Based on Cross-Phase Modulation and Spectral Slicing

Polarization independent all-optical retiming is demonstrated experimentally at 10 Gb/s using a self-pulsating DFB laser and cross-phase modulation in a highly nonlinear fiber. Regardless of its state-of-polarization, the timing jitter of retimed data signal is less than 2 ps. copy2006 Optical Society of America

Cascadability of an All-Optical 3R Regenerator Utilizing Nonlinear Phase Modulation and Offset Filtering at 10 and 40 Gb/s

The cascadability of a polarization-insensitive wavelength-preserving all-optical 3R regenerator is experimentally investigated for bit rates of 10 and 40 Gb/s. The regenerator consists of a self-pulsating laser for clock recovery, cross-phase-modulation-based retiming, and self-phase-modulation-based reshaping. A recirculating loop is used to demonstrate the cascadability of the regeneration scheme by transmitting return-to-zero on-off-keyed signals over 18 000 km at 10 Gb/s and over 8000 km at 40 Gb/s.

Polarization insensitive all-optical retiming based on cross-phase modulation and offset filtering with distributed raman amplification

Adding distributed Raman amplification to a polarization insensitive all-optical retiming technique based on crossphase modulation and offset filtering reduces the timing jitter of 10 Gb/s retimed signals.

Application of a passively mode-locked quantum-dot Fabry-Perot laser in 40 Gb/s all-optical 3R regeneration

The application of a mode-locked quantum-dot Fabry-Perot (QD-FP) laser in a wavelength preserving all-optical 3R regenerator is demonstrated at 40 Gb/s. The 3R regenerator consists of a QD-FP laser for low-timing jitter clock recovery, cross-phase modulation based retiming, and self-phase modulation based reshaping. The performance of the alloptical 3R regenerator is assessed experimentally in terms of the Q-factor, timing jitter and bit-error ratio.

40 Gb/s wavelength preserving polarization insensitive all-optical 3R regenerator utilizing Raman amplification, cross- and self-phase modulation, and offset filtering

All-optical 3R regeneration is demonstrated at 40 Gb/s that is wavelength-preserving and insensitive to the state of polarization of the input signal. The regenerator consists of retiming and reshaping stages that must be carefully co-designed.

Spectral Filtering Characteristics of a Quantum-Dash Fabry-Pérot Laser and Its Implications on 40 Gb/s XPM Based Optical Retiming Performance

The implications of filtering the emission from a quantum-dash Fabry-Pérot laser, which is actively mode locked by injection of a 40 Gb/s return-to-zero on-off-keyed signal, are investigated in the context of all-optical retiming based on cross-phase modulation in a highly nonlinear fiber. Using the measured complex optical spectrum, it is shown that a filtered clock signal with six laser modes exhibits the most suitable pulse shape for broadening the spectrum of a co-propagating data signal in the highly nonlinear fiber. It is also shown that for a filtered clock signal with six laser modes, simulated Brillouin scattering in the fiber is effectively suppressed. All-optical retiming using an appropriately filtered clock signal yields a root-mean-square timing jitter of 420 fs for an input signal with an optical signal-to-noise ratio of 22 dB (0.1 nm noise bandwidth).

40 Gb/s XPM based all-optical retiming using filtered clock signals from a quantum-dash fabry-perot laser

The implications of the number of laser modes in the spectrum of a filtered clock signal on XPM based retiming is investigated in terms of SBS suppression, spectral broadening and timing jitter.

Characterizing the Noise Transfer Properties of an All-Optical Regenerator

To determine the noise transfer properties of all-optical regenerators, the relative standard deviation for the peak power of the output pulse is shown to be a useful quantity that is consistent with more detailed measurements.

System performance of 40 Gb/s DPSK all-optical clock recovery based on a self-pulsating DBR laser

The performance of 40 Gb/s RZ- and NRZ-DPSK all-optical clock recovery based on a self-pulsating DBR laser is characterized by the timing jitter and receiver sensitivity.