Bulk and quantum well semiconductor lasers are extremely sensitive to back reflections and the optical isolators are commonly used in photonics network to prevent the appearance of instabilities that deteriorate the bandwidth. Here we will analyse, both theoretically and experimentally, the sensitivity of quantum dot semiconductor lasers to optical feedback. In particular, we will show that these devices have indeed a reduced sensitivity to optical feedback although the line-width enhancement factor is relatively large and show that this can be associated with the gain saturation characteristic of quantum
dot devices.

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