Patent ID: 6181850
Filing Date: 2001-01-30
Classification: G02B

Abstract:
An optical device comprising:an incident side optical waveguide portion,an outgoing side optical waveguide portion situated near the incident side optical waveguide portion,a first optical reflecting member situated between the incident side optical waveguide portion and the outgoing side optical waveguide portion, said first optical reflecting member returning a part of an incident beam passing through the incident side optical waveguide portion to the incident side optical waveguide portion and allowing a part of the incident beam to pass therethrough, said first optical reflecting member being a wavelength division multiplexer,an optical isolator with polarization independent characteristic situated between the first optical reflecting member and the outgoing side optical waveguide portion,a first lens situated between the first reflecting member and the incident side optical waveguide portion,a second lens situated between the first optical reflecting member and the optical isolator,a second optical reflecting member situated at a side opposite to the first reflecting member relative to the optical isolator and forming an optical branching device, anda third lens situated between the second reflecting member and the outgoing side optical waveguide portion.