Abstract
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 under practical considerations. We give trade-offs between spectral efficiency and hardware complexity, by comparing coding schemes using capacity achieving constellations with bit-interleaved coded modulation and iterative decoding (BICM-ID) against applying conventional square quadrature amplitude modulation (QAM) constellations but employing powerful low complexity low-density parity-check (LDPC) codes. Both schemes are suitable for optical single carrier (SC) and optical orthogonal frequency-division multiplexing (OFDM) transmission systems, where we consider the latter one in this paper, due to well-studied equalization techniques in wireless communications. We numerically study the performance of different coded modulation formats in optical OFDM transmission, showing that for a fiber optical transmission link of 960 km reach the net spectral efficiency can be increased by ≈0.4 bit/s/Hz to 8.61 bit/s/Hz at a post FEC BER of <10-15 by using coded optimized constellations instead of coded 64-QAM.In this paper we propose a high spectral efficient coded modulation scheme for implementation in future optical communication systems operating at data rates beyond 400 Gb/s. In detail, we adapt the “Turbo Principle” to BICM-ID[8] 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[9]. The optical channel is considered to be weakly-nonlinear. Therefore the proposed techniques are also applicable for single-carrier transmission; however we consider OFDM since it appears to be more appropriate for the high order modulation formats and efficient equalization algorithms that are well established in wireless communications.
Highlights
Over the last decade there has been an exponent ial growth of bandwidth-intensive services such as video on demand, cloud storage and social networking which require large volu mes of data to be transmitted over long distances
We restricted the use of lo w-density parity-check (LDPC) codes and utilized recursive systematic convolutional (RSC) codes, since they offer a greater degree o f freedo m in design for coded modulation, when the code rate is high
In this paper we presented a simple, but spectral highly efficient coding scheme for optical orthogonal frequency-division mu ltiplexing (OFDM)-based communicat ions, relying on the concatenation of bit-interleaved coded modulation and iterative decoding (BICM-ID) with a h igh-rate outer code to obtain a post-Forward Error Correct ion (FEC) BER < 10-15
Summary
Over the last decade there has been an exponent ial growth of bandwidth-intensive services such as video on demand, cloud storage and social networking which require large volu mes of data to be transmitted over long distances. This growth is likewise to continue, driving the need to increase transmission capacity. Th is a llo ws a p er polarization spectral efficiency of up to 2.0 bit/s/Hz. generation systems will need to supply data rates beyond 400 Gb it/s. It is necessary to exp loit the channel capacity of the fiber up to its theoretical limit. The most effective method to increase the spectral efficiency of any co mmun icat ion system is to emp loy larger modu lat ion formats[2]. In order to approach channel capacity the constellation itself needs to be modified with respect to
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