Abtract:- Low-density parity-check (LDPC) codes were first introduced by Gallager. These are linear block codes. Their parity-check matrix contains only a few 1‟s in comparison to the amount of 0‟s so these codes are called as low density parity check codes. It is a very powerful code for forward error correction system. The LDPC code can be modified and with which the quality factor can be improved because the presently used LDPC code in optical fibre communication systems is not meeting the requirements of the high speed fibre optics communication systems. This modification is beneficial for the high speed fibre optic communication systems. We explain here a sum product decoding algorithm and modified sum product decoding algorithm of low density parity check code useful in Optical fibre communication. BP and MS modified decoding algorithm also use for a better performance in high speed fibre optic communication. Keywords:- Low density parity check codes (LDPC), Sum-Product (SP), Belief propagation (BP), Min-sum decoding (MS), Bit error rate (BER), additive white Gaussian noise (AWGN). I
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