This paper presents a simple, compact and low cost mode-locked Erbium-doped fiber laser (EDFL) using a single-walled
carbon nanotubes (SWCNTs) embedded in poly(ethylene oxide) (PEO) film as a passive saturable absorber. The film
was fabricated using a prepared homogeneous SWCNT solution, which was mixed with a diluted PEO solution and
casted onto a glass petri dish to form a thin film by evaporation technique. The film, with a thickness of 50 μm, is
sandwiched between two fiber connectors to construct a saturable absorber, which is then integrated in an EDFL cavity
to generate a self-started stable soliton pulses operating at 1560.8 nm. The soliton pulse starts to lase at 1480 nm pup
power threshold of 12.3 mW to produce pulse train with repetition rate of 11.21 MHz, pulse width of 1.02 ps, average
output power of 0.65 mW and pulse energy of 57.98 pJ. Then, we observed the 4th, 7th and 15th harmonic of
fundamental cavity frequency start to occur when the pump powers are further increased to 14.9, 17.5 and 20.1 mW,
respectively. The 4th harmonic pulses are characterized in detail with a repetition rate of 44.84 MHz, a transform-limited
pulse width of 1.19 ps, side-mode suppression ratio of larger than 20 dB and pulse energy of 9.14 pJ.
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