Feedback seeding scheme for wide frequency band with low seeding power

In this paper, We use Feedback seeding scheme FBS to increase the scalability of colorless passive optical networks. FBS is compared with remote seeding scheme. In the Feedback seeding scheme, the OSNR is higher in FBS scheme than in remote seeding scheme between 1525 nm and 1585 nm. The results show the improvement in the BER performance when the feedback seeding scheme is implemented at the wavelengths 1525 nm, 1530 nm, 1580 nm and 1585 nm Remote seeding scheme provides sufficient sensitivity at wavelengths around the center of C band, while FBS works sufficiently at the whole band. These results show that the proposed FBS scheme provides additional 25 nm in the frequency band to be used for upstream channels using the same SOA.