Patent ID: 8098989
Filing Date: 2012-01-17
Classification: G02F,H04J

Abstract:
1. An apparatus comprising: a first laser source for providing a first lightwave; a first optical coupler that is polarization maintaining for dividing the first lightwave into first and second optical carrier lightwaves; first and second modulators for modulating respective ones of the first and second carrier lightwaves with information; a polarization beam combiner for combining the modulated first and second carrier lightwaves and generating a polarization multiplexing optical signal, said polarization beam combiner assuring that the combined modulated first and second lightwaves are orthogonal to an optical fiber; second and third lasers for providing second and third lightwaves whose wavelengths are one of both longer than that of the first lightwave and shorter than that of the first lightwave; a second optical coupler that is polarization maintaining for combining the second and third lightwaves, said second optical coupler assuring that the second and third lightwaves have the same direction; a third optical coupler for combining the modulated first and second carrier lightwaves from the polarization beam combiner and the generated polarization multiplexing optical signal for transmission over an optical medium.