This book describes two categories of work, i.e., the
finite-difference full-vectorial beam propagation method
(FD-FV-BPM) development and microlens design for single-mode fiber
(SMF) to laser diode (LD) coupling. Chapter 2 gives a review of the
general formula to solve the FV-BPM equation of electric formula by
using the FD method. The FD-FV-BPM based eigenmode solver is then
successfully employed to investigate the effective index of the
fundamental modes in an air-filled silica index-guiding photonic
crystal fiber. Chapter 3 presents an improved FD-FV-BPM for
arbitrary optical waveguides simulation with a dramatic improvement
in accuracy. In Chapter 4, an improved wedge-shaped fiber design is
presented for coupling 980nm pump LDs to SMFs. In Chapter 5, a
tapered and hemispherically-ended graded-index fiber (GIF)
structure is demonstrated for the coupling between SMFs and 1330nm
or 1550nm LDs. In Chapter 6, an ideal microlens profile for
flatting the equiphase distribution of a Gaussian laser beam is
obtained analytically by a design tool based on the combination of
Gaussian beam theory and ray optics.
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