Optical module
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsAkira YAHAGI, Toshiaki Watanabe
Life of this patent
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Abstract
An optical module is provided that includes a Faraday rotator having a Verdet constant at a wavelength of 1.06 μm of at least 0.27 min/(Oe·cm), a first hollow magnet disposed on the outer periphery of the Faraday rotator, and second and third hollow magnet units disposed so as to sandwich the first hollow magnet on the optical axis. The second and third hollow magnet units include 2 or more magnets equally divided in a direction of 90 degrees relative to the optical axis. A magnetic flux density B (Oe) applied to the Faraday rotator is in the range of 0.5×104≦B≦1.5×104. The Faraday rotator is disposed on a sample length L (cm) in the range of 0.70≦L≦1.10, and has an external diameter D (cm) in the range of 0.20≦D≦0.60.
Claims10
An optical module comprising:
- a Faraday rotator having a Verdet constant at a wavelength of 1.06 μm of at least 0.27 min/(Oe·cm);
- and
- a first hollow magnet disposed on the outer periphery of the Faraday rotator and second and third hollow magnet units disposed so as to sandwich the first hollow magnet on the optical axis,
- the second and third hollow magnet units comprising 2 or more magnets equally divided in a direction of 90 degrees relative to the optical axis,
- the Faraday rotator having applied thereto a magnetic flux density B (Oe) in the range of Formula (1) below,
- the Faraday rotator being disposed on a sample length L (cm) in the range of Formula (2) below, and
- the Faraday rotator having an external diameter D (cm) in the range of Formula (3) below.
- 0.5×104≦B≦1.5×104 (1)
- 0.70≦L≦1.10 (2)
- 0.20≦D≦0.60 (3)
Dependencies are inferred from the claim text.