Design of a double clad optical fiber with particular consideration of leakage losses

1. RESULTS AND DISCUSSION

1.1. Leakage loss calculation The radiation losses associated with double-clad fiber with wide depressed cladding can be derived in terms of V2, γ, σ and κ (Leonard et al., 1982). Comparisons The design fiber with double clad has been compared with ordinary fiber at different aspects. In Figure 7, cut off number of designs fiber is denoted by the red curves and the cutoff number of the single clad fiber is denoted by blue curves.

2. Conclusion

2.1. In this paper we have proposed a design of double clad optical fiber and analyzed its characteristics at different conditions with the single clad optical fiber.

3. INTRODUCTION

3.1. In the leaky waveguides, the low refractive index surrounding region has a finite thickness comparable to the penetration depth of the guided field and beyond this distance the medium has a refractive index equal to or greater than that of the guiding region.

4. EXPERIMENTAL DESIGN

4.1. Propagation of ray in a leaky structure In the design of the double clad optical fiber we considered that the optical fiber consists of one core and two cladding that is, the inner and the outer cladding. The refractive index of the core and the outer cladding is the same. Cut-off characteristics If β/k> n3, then there are no leakage losses. However, if the propagation constant is smaller, so that β/k < n3, then the mode is said to be “cut off” because power radiates through the outer cladding.