  The notion of intrinsic system of coordinates is introduced for the photon
from the constraint of transversality condition. The degree of freedom to
specify the intrinsic system is extracted from the same constraint, which turns
out to be responsible for the spin Hall effect of light. It is shown that the
fundamental quantization conditions that break down in the laboratory system of
coordinates restore in the intrinsic system, which make it realizable to
canonically quantize the radiation field. It is also shown that the dependence
of the intrinsic system on the momentum underlies the noncommutativity of
photon position in the laboratory system. The commutation relations of the spin
and orbital angular momentum that were found by van Enk and Nienhuis [J. Mod.
Opt. \textbf{41}, 963 (1994)] in a second quantized theory are re-derived in
the present first quantized theory.
