  We present an experimental and theoretical study of photon pairs generated by
spontaneous four wave mixing (SFWM), based on birefringent phasematching, in a
fiber which supports more than one transverse mode. We present SFWM spectra,
obtained through single-channel and coincidence photon counting, which exhibit
multiple peaks shown here to be the result of multiple SFWM processes
associated with different combinations of transverse modes for the pump,
signal, and idler waves.
