| 摘要 |
The phase modulator in the laser resonator requires both at the input and at the output defined linearly polarized light which has to be generated. Hitherto, this was brought about in a complex and expensive manner using polarization actuators. The invention provides a combination of dispersion compensation and definition of the linear polarization state in a dispersion compensation fibre (PM-DC fibre) which is birefringent at such a high level that only the two orthogonal linear polarization states can be diffused therein. The invention can be used for mode-locked fibre lasers in which the time pulse width has to be as small as possible.
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