METHOD OF AND APPARATUS FOR ALIGNING THE STRESS-APPLYING PARTS OF POLARIZATION-MAINTAINING OPTICAL FIBER, AND METHOD OF AND APPARATUS FOR MANUFACTURING A POLARIZATION-MAINTAINING COUPLER

摘要

While a pair of left/right observation points of a cladding removed portionof a polarization-maintaining optical fiber are being simultaneously observed,the polarization-maintaining optical fiber is rotated about the axis of thefiber.By doing so, aligning stress applying parts in regard to the polarization-maintainingoptical fiber is performed so that the polarization directions maybe oriented in the same direction along and with respect to the axis of thefiber.