  We show for the first time how deterministic unitary operations on time-bin
qubits encoded in single photon pulses can be realized using fiber optics
components that are available with current technology. We also generalize this
result to operations on time-bin qudits, i.e. $d$-level systems, and show that
this can be done efficiently using 2$\times$2 beamsplitters and phase
modulators. Important benefits for experimental quantum communication are
highlighted. This work shows how to bridge the gap between current
proof-of-principle demonstrations and complete, deterministic experiments.
