Keywords: 
• 掺Er光纤激光器 /
• 光学频率计量 /
• 光纤光学频率梳 /
• 光谱展宽

Abstract: It is the inevitable trend of the development for the optical frequency comb based on the Ti： sapphire femtosecond laser to be replaced by that based on the Er： fiber femtosecond laser. The detection of the carrier-envelope offset f0 in the femtosecond laser is a key to the realization of an optical frequency comb. In this paper, the structure of the optical part of an Er： fiber optical frequency comb is introduced. The optical pulses from an Er： fiber femtosecond laser with a repetition of 230 MHz are first amplified with a two stage amplifiers, spectrally broadened in a highly nonlinear fiber, and then pass through a single-beam f—2f self-referencing interferometer. By optimizing the optical parameters, the f0 with a signal-to-noise ratio of 30 dB is obtained in the Er： fiber femtosecond laser, which is favorable for the realization of an Er： fiber frequency comb.