A unidirectional Er3+-doped fiber ring laser without isolator

Yuan Shi, Milan Sejka, Ove Poulsen

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    An Er3+-doped fiber ring laser with unidirectional operation without optical isolator has been investigated for different cavity conditions. The fiber ring laser cavity is built in such a way that the optical fields propagating in the two directions suffer different losses. As a consequence, the laser oscillation appears in a quasi-unidirectional form. By incorporating a fiber pigtailed bandpass filter to enhance mode competition, a purely unidirectional tunable fiber ring laser is obtained with high efficiency and broad tunability
    Original languageEnglish
    JournalI E E E Photonics Technology Letters
    Issue number3
    Pages (from-to)290-292
    Publication statusPublished - 1995

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