Intensity noise and linewidth of laser diodes with integrated semiconductor optical amplifier

Degradation of the mode suppression in single mode laser diodes due to integrated optical amplifiers

“…exactly the same factor that was found for the linewidth increase due to the ASE of an integrated SOA [3][4]. A is the amplification and α r L d the extraction efficiency from the facet facing the amplifier.…”

“…They are therefore often integrated with a semiconductor optical amplifier to boost the output power [1,2]. In a number of previous papers [3,4], it was shown that in such configurations the amplified spontaneous emission (ASE) from the amplifier couples into the laser diode and may affect the Relative Intensity Noise and the linewidth of these laser diodes. Also the pump lasers in wavelength converters with an integrated pump source suffer from a similar effect [5].…”

Degradation of the Mode Suppression in Single-Mode Laser Diodes Due to Integrated Optical Amplifiers

“…The laser diode is a general multisection DFB or distributed Bragg reflector (DBR) laser diode. A general rate equation for the field of any longitudinal mode in such a laser diode has been derived in a previously published paper [4]. We neglect spatial hole burning and hence assume a uniform carrier density in the active layer of the laser.…”

“…and are the modal gain, inversion factor, and internal loss of the laser and the amplifier, respectively. is the amplification of the amplifier, is the longitudinal Petermann factor, and is the extraction efficiency of the laser facet [4].…”

“…They are therefore often integrated with a semiconductor optical amplifier (SOA) to boost the output power [1], [2]. In a number of previous papers [3], [4], it was shown that in such configurations the ASE from the amplifier couples into the laser diode and may affect the relative intensity noise (RIN) and the linewidth of these laser diodes. Also, the pump lasers in wavelength converters with an integrated pump source ( [5] suffer from a similar effect [5].…”