Non-Carrier Suppressed Homodyne Receiver Using Standard DFB Lasers and Analog Optical Phase-Locked Loop
112Gb/s transmission is now being considered in next-generation fiber networks worldwide. Optical synchronous coherent detection is attracting greater attention within the proactive military community in order to analyze these high speed transmissions. Coherent detection allows linear recovery both of the amplitude and phase of transmitted optical signals in the post-detector RF domain. Therefore, fiber-based transmission impairments such as chromatic dispersion and polarization mode dispersion can be compensated in the electrical domain using this technique. Additionally, synchronous detection offers the potential of improved receiver sensitivity and extended reach versus direct or interferometric detection schemes, especially for spectrally-efficient, higher level modulation formats.