PURPOSE: To form a coupler which prevents variation in operation characteristics with time and operates stably by coupling a polarization plane maintaining optical fiber with another optical component so that their axes have ≤5° angle deviation at a maximum.
CONSTITUTION: When the polarization plate maintaining optical fiber 5 with an elliptic core is coupled with a directional coupling type optical switch 4 made of LiNbO3, the coupler with a mark which indicates the axial direction in optical fiber section is used to couple them with each other to ≤5° angle deviation at a maximum. When the optical fiber 5 is coupled to, for example, 3° deviation, time variation in the quantity of projection light from the output 6 of the optical fiber 6 which is measured throughout about one year is ≤0.1%. Consequently, the coupler which prevents variation in characteristics with time and operates stably is obtained.
MATSUMURA HIROYOSHI
SUGANUMA YASUO
| JPS5632811B2 | 1981-07-30 | |||
| JPS5318145B2 | 1978-06-13 | |||
| JP55077207B |
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