Characteristics of a doubly clad optical fiber with a low-index inner cladding

We present a detailed experimental parameter study on mid-IR supercontinuum generation in W-type index tellurite fibers, which reveals how the core diameter, pump wavelength, fiber length, and pump power dramatically influence the spectral broadening. As pump source, we use femtosecond mid-IR pulses from a post-amplified optical parametric oscillator tunable between 1.7 μm and 4.1 μm at 43 MHz repetition rate. We are able to generate red-shifted dispersive waves up to a wavelength of 5.1 μm by pumping a tellurite fiber in the anomalous dispersion regime between its two zero dispersion wavelengths. Distinctive soliton dynamics can be identified as the main broadening mechanism resulting in a maximum spectral width of over 2000 nm with output powers of up to 160 mW. We experimentally demonstrated that efficient spectral broadening with considerably improved power proportion in the important first atmospheric transmission window between 3 and 5 μm can be achieved in robust W-type tellurite fibers pumped at long wavelengths by ultra-fast lasers.

show abstract

“…21 The core has the largest refractive index of the three, and the outer cladding index is the next largest as can be seen in Fig. 1(a).…”

Section: Properties Of the W-type Index Tellurite Fibermentioning

confidence: 89%

“…1(b). The benefit of a larger possible core diameter helps to lower the coupling losses while still operating under single-mode condition up to a higher V-parameter (V = 3.8) than in conventional step-index fibers 21 (see Fig. 1(c)).…”

Section: Properties Of the W-type Index Tellurite Fibermentioning

confidence: 99%

Solitonic supercontinuum of femtosecond mid-IR pulses in W-type index tellurite fibers with two zero dispersion wavelengths

et al. 2016

View full text Add to dashboard Cite

show abstract

“…(1) is a sufficient condition for index-guided modes, but it is certainly not necessary in general: even when it is violated, one can have guided modes with a cutoff (as for W-profile fibers [17] or waveguides on substrates [12,14]), or other types of guided modes (such as bandgap-guided modes [2][3][4][5]). However, these other types of guides modes in dielectric waveguides have a long-wavelength cutoff, so one can pose the question: is eq.…”

Section: Discussionmentioning

confidence: 99%

“…the core consists of partly increased and partly decreased index; it is known in such cases, e.g. in "W-profile fibers" [17] that there is the possibility of a long-wavelength cutoff for guidance, but precisely how much decreased-index regions does one need to have such a cutoff? Third, under some circumstances it is possible to obtain a "single-polarization" fiber, in which the waveguide is truly single-mode (as opposed to two degenerate polarization modes as in a cylindrical fiber) [18][19][20][21][22][23]-our theorem can be extended, similar to Ref.…”

Section: Introductionmentioning

confidence: 99%

Rigorous sufficient conditions for index-guided modes in microstructured dielectric waveguides

Lee¹,

Avniel²,

Johnson³

2008

Opt. Express

View full text Add to dashboard Cite

Abstract:We derive a sufficient condition for the existence of indexguided modes in a very general class of dielectric waveguides, including photonic-crystal fibers (arbitrary periodic claddings, such as "holey fibers"), anisotropic materials, and waveguides with periodicity along the propagation direction. This condition provides a rigorous guarantee of cutoff-free index-guided modes in any such structure where the core is formed by increasing the index of refraction (e.g. removing a hole). It also provides a weaker guarantee of guidance in cases where the refractive index is increased "on average" (precisely defined). The proof is based on a simple variational method, inspired by analogous proofs of localization for two-dimensional attractive potentials in quantum mechanics.

show abstract

“…A fiber with a W-type core refractive index profile can provide the required filtering, and is the method used in this paper. Such W-profile cores were studied thoroughly in the 1970s [12], mostly for dispersion compensation purposes. However, it is also well known that a W-profile core can act as a low-pass filter since even the fundamental P mode can have a nonzero cutoff [13].…”

Section: Introductionmentioning

confidence: 99%

Neodymium-doped cladding-pumped aluminosilicate fiber laser tunable in the 0.9-/spl mu/m wavelength range

Soh

Yoo

Nilsson

et al. 2004

IEEE J. Quantum Electron.

View full text Add to dashboard Cite

Characteristics of a doubly clad optical fiber with a low-index inner cladding

Cited by 221 publications

References 8 publications

Solitonic supercontinuum of femtosecond mid-IR pulses in W-type index tellurite fibers with two zero dispersion wavelengths

Solitonic supercontinuum of femtosecond mid-IR pulses in W-type index tellurite fibers with two zero dispersion wavelengths

Rigorous sufficient conditions for index-guided modes in microstructured dielectric waveguides

Neodymium-doped cladding-pumped aluminosilicate fiber laser tunable in the 0.9-/spl mu/m wavelength range

Contact Info

Product

Resources

About