  Spin 1 particle is investigated in 3-dimensional curved space of constant
positive curvature. An extended helicity operator is defined and the variables
are separated in a tetrad-based 10-dimensional Duffin-Kemmer equation in quasi
cylindrical coordinates. The problem is solved exactly in hypergeometric
functions, the energy spectrum determined by three discrete quantum numbers is
obtained. Transition to a massless case of electromagnetic field is performed.
