The invention relates to an optical waveguide device for monitoring a characteristics of light, e. A baseline block-target allocator determines a baseline target size for the compressed blocks resulting from the source-image blocks. wherein A1, A2, A3, A4, R1, R2, R3, R4, R5a, R5b, R5c, R5d and p are defined as in the description. A corner sling adapter is mounted at each lifting lug. The active material particles 12a are preferably of a silicon-based material. The rod member, the pulling member and the elastic plate are connected to one another to guide a positioning member to be assembled into the assembling holes in a balance manner, so that the device for assembling and disassembling a bicycle chain makes the assembly of the chain more convenient and simple.