  We report an AlGaInAs multiple quantum well integrated source of polarization
controlled light consisting of a polarization mode converter PMC, differential
phase shifter(DPS), and a side wall grating distributed-feedback DFB laser. We
demonstrate an asymmetrical stepped-height ridge waveguide PMC to realize TE to
TM polarization conversion and a symmetrical straight waveguide DPS to enable
polarization rotation from approximately counterclockwise circular polarization
to linear polarization. Based on the identical epitaxial layer scheme, all of
the PMC, DPS, and DFB laser can be integrated monolithically using only a
single step of metalorganic vapor phase epitaxy and two steps of III V material
dry etching. For the DFB-PMC device, a high TE to TM polarization conversion
efficiency 98% over a wide range of DFB injection currents is reported at 1555
nm wavelength. For the DFB-PMC-DPS device, a 60 degree rotation of the Stokes
vector was obtained on the Poincar\'e sphere with a range of bias voltage from
0 V to -4.0 V at IDFB is 170 mA.
