The polarized wave non dependant single mode ridge optical waveguide whose enclosing action is strong

摘要

Although the sensitivity for the polarized wave is made to decrease substantially, the ridge guided wave road where the enclosing action which other guided wave road quality, for example single mode condition, low does not impair regarding basic mode propagation loss and it bends low and loss that much is strong. This invention, the bend radius where the mode index of guided wave road material constitution and thickness, and basic TE mode and basic TM mode of the guide layer and the clad layer is equal mutually, is inserting ridge width and etching depth in consideration. Making use of these parameters for example loss of basic mode and higher mode (, the imaginary number section of the mode index) it can calculate. Following to this invention by considering the above-mentioned standard, loss of basic mode hiding below approximately 1.0dB/mm, loss of higher mode above approximately 10dB/mm (, loss difference becomes approximately 10dB/mm) can form the loss single mode ridge guided wave road at least low.