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Squeezed light sources, featuring significant degrees of squeezing, flexible time-frequency attributes, and a compact salable form factor, serve as crucial building blocks in an expanding range of applications, spanning from quantum computing to quantum sensing and communications. In this study, we introduce and demonstrate a novel approach to generating squeezed light that exclusively employs standard telecommunication fiber-optic components. The technique leverages the entanglement properties of spontaneous four-wave mixing (SFWM) to generate high squeezing with flexible time-frequency properties. Notably, a record squeezing of 7.5 \(\pm\)0.1 dB is measured within an all-fiber, all-guided-wave platform. The entanglement-assisted squeezing methodology empowers the attainment of squeezing for arbitrary time-frequency modes within the SFWM phase-matching bandwidth, extending beyond coherent laser modes, for the first time. In particular, we measured 5.1 dB and 1.1 dB squeezing on partially coherent and chaotic time-frequency modes that are defined by randomly modulated laser sources and filtered amplified spontaneous emission light, respectively.