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Achieving high spectral efficiency in optical transmissions has recently attracted much attention, aiming to satisfy the ever increasing demand for high data rates in optical fiber communications. Therefore, strong Forward Error Correction (FEC) coding in combination with multilevel modulation schemes is mandatory to approach the channel capacity of the transmission link. In this paper we give design rules on the joint optimization of coding and signal constellations. We propose a novel coded modulation scheme based on 512-IPM for a fiber optical transmission link of 800km.The spectral efficiency achieved was 10% greater i.e,12.1 b/s/Hz at a post FEC BER of <10 -15 by using coded optimized constellation. In detail, the "Turbo Principle" to BICM-ID is adapted and combine it with a high-rate outer algebraic code to obtain a post-FEC BER <10 -15 , which is a typical demand in optical transponders. Furthermore we give simple design principles for the design of BICM-ID based on the extrinsic information transfer (EXIT) chart analysis.

Higher Spectral Efficiency Coherent Optical OFDM Transmission With Iterative Polar Modulation