Title:
OPTICAL ISOLATOR DEVICE
Document Type and Number:
Japanese Patent JPH04116616
Kind Code:
A
Abstract:
PURPOSE:To make the length of an expensive polarization separating element short and to obtain a compact and inexpensive optical fiber type optical isolator without depending on polarization by inserting the polarization separating element between an optical fiber and a lens. CONSTITUTION:This device is constituted by arranging the optical fiber for incidence f1, the 1st polarization separating element 31, the 1st lens for collimating L1, a Faraday rotating element R1, the 2nd lens for focusing L2, the 2nd polarization separating elements B2 and B3, and the optical fiber for receiving light f2 in this order. The light which passes through the 1st element B1 from the optical fiber f1 and is emitted is converted into an almost collimated beam by the 1st lens L1 and further the collimated beam which passes through the element R1 is converted focusing beam by the 2nd lens L2 so as to be coupled on the fiber f2 through the elements B2 and B3. Thus, thin polarization separating elements B1 - B3 are applied and the optical isolator without depending on the polarization, whose cost is made low and which is miniaturized, is obtained.
Inventors:
SARUWATARI MASATOSHI
TAKARA HIDEHIKO
TAKARA HIDEHIKO
Application Number:
JP23774390A
Publication Date:
April 17, 1992
Filing Date:
September 07, 1990
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G02B27/28; (IPC1-7): G02B27/28
Attorney, Agent or Firm:
Masatake Shiga