报道了一种全光纤结构耗散孤子被动锁模光纤激光器。激光器中使用了一种基于多模干涉原理的光纤滤波器，它由两段单模光纤和一段多模光纤组成。通过合理的选取多模光纤的长度，制作了中心波长在1067 nm处、3 dB带宽为7.5 nm的光谱滤波器并将其应用于全正色散被动锁模掺镱光纤激光器中。实验中使用半导体可饱和吸收镜(SESAM)作为锁模元件，在抽运功率为865 mW时，获得重复频率为18.5 MHz的稳定锁模啁啾脉冲串，脉冲宽度为21 ps，平均输出功率为8 mW，单脉冲能量为0.43 nJ。输出脉冲光谱半峰全宽为4.32 nm，光谱边缘有明显陡沿。

An all-fiber dissipative-soliton passively mode-locked fiber laser is reported. A filter based on multimode interference is used, which consists of two seqments of single-mode fiber (SMF) and a segment of multimode fiber (MMF). By proper selection of the MMF length, a band-pass filter with central wavelength of 1067 nm and band width of 7.5 nm is fabricated. The filter for spectral filtering in an all-normal dispersion mode-locked ytterbium-doped fiber laser is used. A semiconductor saturable absorber mirror (SESAM) is used as a saturable absorber in the laser cavity. With the pump power of 865 mW, stable pulse train which is highly chirped with average repetition rate of 18.5 MHz and pulse width of 21 ps is obtained. The average output power is 8 mW, so the single pulse energy is 0.43 nJ. The full width at half maximum (FWHM) of output pulse is 4.32 nm. The spectrum has a steep edge.