  We showcase a fully on-chip CMOS-fabricated silicon photonic integrated
circuit employing a bidirectionally pumped microring and polarization
splitter-rotators tailored for the generation of ultrabroadband ($>$9 THz),
high-fidelity (90-98%) polarization-entangled photons. Spanning the optical
C+L-band and producing over 116 frequency-bin pairs on a 38.4 GHz-spaced grid,
this source is ideal for flex-grid wavelength-multiplexed entanglement
distribution in multiuser networks.
