We observe a polarization instability in circularly symmetric vertical‐cavity surface‐emitting lasers. A relatively long time, 3–5 ns, is required to establish a dominant polarization state. Under high‐speed digital modulation this leads to strong enhancement, 20–30 dB, in polarization resolved low‐frequency relative intensity noise. This polarization instability is accurately described by a simple rate‐equation model. A similar increase in relative intensity noise, under dc bias, is caused by energy partition between orthogonally polarized modes.

Topics
Electrical properties and parameters, Electronic noise, Lasers, Chemical reactions
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© 1995 American Institute of Physics.
1995
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