| CPC G02B 6/2861 (2013.01) [G02B 7/182 (2013.01)] | 19 Claims |

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1. An optical delay line structure, for adjusting light path to an optical fiber, the optical delay line structure comprising:
an outer housing, connected to the optical fiber;
an inner housing, connected to the outer housing, including a plurality of fixing screw holes; and
a reflection assembly, connected to the inner housing, and comprising:
a reflection mirror holder, having a plurality of mirror holder screw holes;
a reflection mirror, configured in the mirror holder;
a plurality of fixing screws, respectively corresponding to the plurality of fixing screw holes, and movably penetrated through the fixing screw holes and part of the mirror holder screw holes; and
a plurality of adjustment screws, movably penetrated through a part of the mirror holder screw holes and against the inner housing, when adjusting at least one of the adjustment screws, the adjustment screws drive the mirror holder so that the reflection mirror is axially tilting;
wherein the optical delay line structure further comprises an optical path adjustment assembly and an accommodating space, and the optical path adjustment assembly comprises a screw rod and a turning gear, a screw rod adjusting member is disposed in the accommodating space, wherein the screw rod adjusting member has a screw rod adjusting member head and a screw rod adjusting member body, the screw rod adjusting member head is disposed inside the turning gear, the screw rod adjusting member body is disposed inside the screw rod.
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