Passively modelocked fiber laser using carbon nanotubes

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A passively modelocked fiber laser (10) utilizes a rare-earth-doped fiber section (12) as the gain medium, which exhibits a relatively high absorption (e.g., peak pump absorption > 50 dB/m) and relatively low dispersion (e.g., -20 ps/km-nm < Dg < 0). Passive modelocking is provided by a single-walled carbon nanotube (SWNT) saturable absorber (30, 80), formed on endface portions of a section of un-doped fiber. The remaining components (input/output couplers (16, 24), isolator (20)) are preferably integrated into a single component (76) and coupled to the un-doped optical fiber (78). This combination yields a laser cavity with a slightly anomalous overall dispersion, preferred for soliton generation and creating optical pulses with a sub-picosecond pulse width and repetition frequency over 100 MHz.