InGaAsP/InP DualWavelength Bipolar Cascade Lasers withlOOnmWavelength Spacing

Simultaneous dual-wavelength (1350nm and1450mn) lasing isachieved froman InGaAsP/InP bipolar cascade laser, whichincludes twodifferent active regions anda low resistance hetero-tunnel-ju nction. Ultra-broadband gainmaterials canbeobtained withsucha structure.