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A remote-control-free self-feedback colorless Fabry-Perot laser diode (FPLD) transmitter single-mode controlled with a fiber Bragg grating reflector-based self-feedback block is successfully demonstrated and optimized for 2.5-5 Gb/s dense wavelength division multiplexed passive optical network transmissions. The maximal power budget of such a single-mode lasing colorless FPLD at 2.5-Gb/s transmission is determined as 25 dB under the feedback ratio of 90%. With increasing the bias of the self-feedback colorless FPLD, both the power of self-feedback carrier and extinction of the inherent modes are enhanced. Between the bias of 38 and 42 mA (~2-2.25 times of Ith), the tradeoff between injection efficiency and mode extinction is compromised, leading to the optimized single-mode output with side-mode suppression ratio of 48 dB, modal linewidth of 0.01 nm, and relative intensity noise floor of -102 dBc/Hz. At same bias, the self-feedback colorless FPLD modulated at 2.5-Gb/s can perform a 25-km single-mode fiber (SMF) transmission with a receiving power sensitivity of -30.5 dBm at bit error rate of 10-9. With the aid of a gain-saturated SOA fiber loop inserted in the self-feedback block to enhance the data-erasing, the self-feedback single-mode colorless FPLD successfully provides an error-free transmission up to 5 Gb/s after 25-km SMF.