16 November 2004 Wide chirp spectrum from FM oscillation fiber laser and its application in pulse generation
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Abstract
A wide band FM light source is useful for many applications in the areas of communication, spectroscopy and sensing. Chirped light can be generated by modulating the laser output externally with a phase modulator. But the spectrum is usually not wide enough due to the modest modulation depth of available commercial modulator. A more efficient method is to perform phase modulation of light inside the laser cavity, which under certain cavity detuning conditions can perform deeper FM modulation through cavity mode coupling effect. The output spectrum is much wider than that obtained external modulation alone. In this paper, we show the theoretical and experimental result of a 40GHz FM oscillation fiber laser. The detuning frequency and single-pass modulation depth can affect the final spectrum width. The wide spectrum of 1.42THz around 1560nm is obtained in the experiment. By using single mode fiber as dispersion medium only, we can compress the constant intensity light with 1.42THz bandwidth to 821fs pulse. This laser appears to be of great interest for study of high-speed optical communication systems for the impairments and their impacts at wide frequency range. Or, its ultra-wide, chirp output with high sweep rate will be useful for rapid and extremely sensitive interferometric measurements.
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Shiquan Yang, Evgueni A. Ponomarev, Xiaoyi Bao, "Wide chirp spectrum from FM oscillation fiber laser and its application in pulse generation", Proc. SPIE 5579, Photonics North 2004: Photonic Applications in Telecommunications, Sensors, Software, and Lasers, (16 November 2004); doi: 10.1117/12.567072; https://doi.org/10.1117/12.567072
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