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Experimental studies of subharmonic modulation distortions of semiconductor lasers with optical feedback are described. These distortions were found to exhibit almost resonant frequency characteristics and threshold behaviour against the modulation frequency and its depth, respectively. It was inferred that they would be excited by parametric interactions caused by some laser diode parameter changes...
Static and dynamic optical spectra of 1.55 ?m DCPBH-DFB lasers are analysed. These lasers were packaged in hermetic sealed enclosures and directly modulated with transmitter circuitry. We have found that their static spectra observed under CW operation have fine structure induced by optical feedback from the far end of the package fibre pigtail. The dynamic spectra taken under pulsed modulation differ...
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