IV. RESULTS AND DISCUSSION
Figs. 4 and 5 show themeasurement results of the Faraday rotation
angle and the change in polarization states on a Poincare
sphere of the CdSe QDs doped optical fiber at 660 nm as a function
of magnetic field, respectively. With the increment of applied
magnetic field by varying DC current of the solenoid, the
Faraday rotation angle of the CdSe QDs doped fiber was found
to increase linearly as shown Fig. 4. When the magnetic field
of 0.119 T was applied to the effective length 183 cm of the
fiber, the Faraday rotation angle reached to 45 . Since the polarization
angle of 90 rotation of back-reflected light is expected
due to the non-reciprocal nature of the Faraday effect, this result
clearly demonstrates a possibility of developing all-optical
fiber isolator that can block the reflected light at 660 nm. In the
earlier work, the Verdet constant of the CdSe QDs doped fiber
was measured to be 3.8 and 0.358 at 633
nm and 1310 nm, respectively [19]–[21]. The Verdet constant
IV. RESULTS AND DISCUSSIONFigs. 4 and 5 show themeasurement results of the Faraday rotationangle and the change in polarization states on a Poincaresphere of the CdSe QDs doped optical fiber at 660 nm as a functionof magnetic field, respectively. With the increment of appliedmagnetic field by varying DC current of the solenoid, theFaraday rotation angle of the CdSe QDs doped fiber was foundto increase linearly as shown Fig. 4. When the magnetic fieldof 0.119 T was applied to the effective length 183 cm of thefiber, the Faraday rotation angle reached to 45 . Since the polarizationangle of 90 rotation of back-reflected light is expecteddue to the non-reciprocal nature of the Faraday effect, this resultclearly demonstrates a possibility of developing all-opticalfiber isolator that can block the reflected light at 660 nm. In theearlier work, the Verdet constant of the CdSe QDs doped fiberwas measured to be 3.8 and 0.358 at 633nm and 1310 nm, respectively [19]–[21]. The Verdet constant
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