Optical waveguides – With optical coupler – Particular coupling function
Reexamination Certificate
2006-01-24
2006-01-24
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
With optical coupler
Particular coupling function
C372S006000, C398S042000
Reexamination Certificate
active
06990270
ABSTRACT:
A source of high-power femtosecond optical pulses comprises a combination of a relatively short rare-earth doped fiber amplifier (e.g., less than five meters) with a first section of single mode fiber (or other dispersive element) disposed at the input of the amplifier to “pre-chirp” the output from a femtosecond pulse source, and a second section of single mode fiber fused to the output of the fiber amplifier to provide compression to the amplified pulses generated by the fiber amplifier. The rare-earth doped fiber amplifier is formed to comprise a normal dispersion, which when combined with self-phase modulation and distributed gain leads to a regime in amplifiers defined as “self-similar propagation”. In this regime of operation, the fiber amplifier generates high energy pulses with a parabolic shape (the parabolic shape defined as a function of time). These pulses also exhibit a strong linear chirp, where the linear nature of the chirp leads to efficient compression of the pulses.
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Fitel U.S.A. Corp.
Ullah Akm Enayet
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