A wavelength-division multiplexed passive optical network for reducing degradation of a noise characteristic of a wavelength-locked Fabry-Perot Laser Diode, F-P LD, comprising: a central office, CO,; a remote node being connected to the CO by a single mode fiber; and one or more optical network terminations, ONTs, being connected to the RN by one or more single mode fibers, respectively, wherein the CO comprises: a broadband light source, BLS, with a non-flat output spectrum for generating light of a first bandwidth to be injected into a first wavelength-division multiplexing, WDM, filter; a first WDM filter for filtering the injected light generated from the BLS and having a second bandwidth wider than the first bandwidth of the injected light in order to minimize a filtering effect; and one or more optical transceivers (110a,... 110n) having one or more F-P LDs into which light being filtered by the first WDM filter is injected; and wherein the RN filters the injected light generated from the BLS and injects the filtered light into the one or more ONTs; and wherein the RN comprises a second WDM filter having a third bandwidth wider than the first bandwidth of the injected light in order to minimize a filtering effect; and wherein the BLS comprises a multi-stage optical amplifier; and an optical filter having a non-flat output spectrum being inserted into and connected to between the multi-stage optical amplifier. a central office, CO,; a remote node being connected to the CO by a single mode fiber; and one or more optical network terminations, ONTs, being connected to the RN by one or more single mode fibers, respectively, wherein the CO comprises: a broadband light source, BLS, with a non-flat output spectrum for generating light of a first bandwidth to be injected into a first wavelength-division multiplexing, WDM, filter; a first WDM filter for filtering the injected light generated from the BLS and having a second bandwidth wider than the first bandwidth of the injected light in order to minimize a filtering effect; and one or more optical transceivers (110a,... 110n) having one or more F-P LDs into which light being filtered by the first WDM filter is injected; and wherein the RN filters the injected light generated from the BLS and injects the filtered light into the one or more ONTs; and wherein the RN comprises a second WDM filter having a third bandwidth wider than the first bandwidth of the injected light in order to minimize a filtering effect; and wherein the BLS comprises a multi-stage optical amplifier; and an optical filter having a non-flat output spectrum being inserted into and connected to between the multi-stage optical amplifier. a broadband light source, BLS, with a non-flat output spectrum for generating light of a first bandwidth to be injected into a first wavelength-division multiplexing, WDM, filter; a first WDM filter for filtering the injected light generated from the BLS and having a second bandwidth wider than the first bandwidth of the injected light in order to minimize a filtering effect; and one or more optical transceivers (110a,... 110n) having one or more F-P LDs into which light being filtered by the first WDM filter is injected; and wherein the RN filters the injected light generated from the BLS and injects the filtered light into the one or more ONTs; and wherein the RN comprises a second WDM filter having a third bandwidth wider than the first bandwidth of the injected light in order to minimize a filtering effect; and wherein the BLS comprises a multi-stage optical amplifier; and an optical filter having a non-flat output spectrum being inserted into and connected to between the multi-stage optical amplifier.