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This talk covers novel techniques and applications of low noise ultrafast optical pulses and stabilized optical frequency combs. Applications are focused on photonic ultrawide-band signal processing, such as waveform generation and measurement, and matched filtering.
A DC-coupled burst-mode receiver performs optical power calibration in 12.5ns, achieves phase lock in 18.5ns and tracks input data using a CDR. The sensitivity of the 4.4pJ/bit receiver is −10.9dBm (BER < 10−12) at 25Gb/s.
An optical pulse injection locking technique is employed to generate shorter pulses from a passively modelocked quantum dot laser. The optical pulse injection locking enables the coherent addition of phaselocked longitudinal mode groups from two separate modelocked lasers without the use of stabilisation control loops, thus increasing the spectral bandwidth output resulting in optical pulses with...
Spectral interferometry is used to measure the dispersion of a quantum dot semiconductor optical amplifier under various injection current values in the wavelength range of 1200 to 1340 nm, spanning ground and first excited state.
Large cavity, very low threshold single layer quantum dot laser diodes with threshold current density of 10 A/cm2, output power > 2 W, and very-low internal loss of 0.25 cm-1 are achieved at CW room-temperature. Mode-locked operation of a large cavity laser diode with 40 mum stripe width is demonstrated at 3.75 GHz repetition rate.
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