Abstract
At typical read powers, laser intensity fluctuations can be the dominant source of noise in the read channel of an optical drive. Even with the isolation present in most write-once optical heads, optical feedback (OFB) can be a significant contributor to the noise in the system read channel. The dominant laser noise sources are mode hopping and mode partition noise.' The former noise is particularly troublesome as it results from an alternation of the dominant laser mode, which causes output power fluctuations and irreproducible playback performance. At certain combinations of drive current, temperature, and optical feedback, this unstable behavior is observed. The second contributor, mode partition noise, is the broad-band noise associated with the transient variation in the partition of energy per mode.
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