We report a broadband energy-time entangled photon-pair source based on a fiber-coupled periodically poled lithium niobate waveguide, designed for applications in quantum secure networks. Utilizing the spontaneous parametric down-conversion nonlinear optical process and a pump wavelength of 770.3 nm, the source generates entangled photon pairs within a wavelength range of 64 nm in the telecom band. Photons from eight paired ITU channels are selected, and their correlation and entanglement properties are characterized. The measured coincidence counts of all eight correlated photon pairs are larger than 152.9 kHz when the coincidence-to-accidental ratio is greater than 260. Entanglement properties are measured through two-photon interference in the Franson interferometer, with all visibilities of interference curves exceeding 98.1%. Our demonstration provides a broadband energy-time entangled photon-pair source, contributing to the development of large-scale quantum secure networks.