Semiconductor Optical Amplifiers

Investigation of a cross‐gain modulation in a semiconductor optical amplifier based on a quantum dot‐in‐a‐well structure

“…Quantum dot semiconductor optical amplifiers (QD SOAs) provide a wide range of functional applications including wavelength conversion (WC), regeneration, photonic switching and various all-optical signal processing components [1][2][3][4][5][6][7][8][9]. The important advantages of QD SOAs are an inhomogeneously broadened gain spectrum because of the QD size distribution and strong non-linearity [1][2][3][4][5][6][7][8][9]. The typical methods of WC essential for optical wavelength division multiplexing network operations are non-linear phenomena of a cross-gain modulation (XGM) and cross-phase modulation (XPM) in a QD SOA [5].…”

Non-equilibrium long-range phase transition in cold atoms : theory and experiment

“…The primary laser consists in a extended diode-laser (ECDL) delivering enough IR power at 922 nm to inject a tapered amplifier stage which amplifies the optical signal. The tapered amplifier (TA) can be seen as a laser-diode which achieves population inversion for a high enough incident power and driving current [134,135]. If TAs compete with fiber amplifiers by their compactness, they however exhibit much stronger noise and nonlinear distortions.…”

Tunable External Cavity Ring Laser with Wavelength Selective Elements

“…However, compared with the EDFA, SOAs have low gain and high noise. One advantage of SOAs is that they can be pumped electrically by low power systems [10]. High power may cause nonlinear effects in the fiber or overload the receiver when an EDFA is used by a wavelength-division multiplexing (WDM) system to transmit signals.…”