All-photon memory, holding significant potential for applications in optical communication systems and neural network computing, and developing an all-optical dual-channel fiber storage platform that achieves integrated storage and computation is challenging. In this paper, a non-volatile, high-contrast, and highly repeatable bipolar memory is demonstrated, achieved by integrating two tapered fibers with a fiber microsphere containing phase change materials(PCMs). Employing an external laser modulation technique, repeatable or randomly accessible 6-level data storage is enabled by altering the state of Ge2Sb2Te5 (GST). Multi-stage writing is accomplished using a 532 nm pump laser witha10 ns pulse width and laser energy ranging from 0.423 mJ to 1.206 mJ, while a 793 nm continuous wave (CW) laser with an average power of 4 mW to 11 mW is utilized for the multi-stage reset process. Exhibiting a write response time of 75ns, a reset response time of 180 ns, and a contrast of 18 dB, the bipolar memory preliminarily realizes the synaptic weight update mechanism in the synapse of neural network systems
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