| US 7,325,984 B2 | ||
| Optical subassembly enhancing wiggle tolerance and a method for manufacturing the same | ||
| Hiromi Nakanishi, Yokohama (Japan); and Kenji Hirayama, Yokohama (Japan) | ||
| Assigned to Sumitomo Electric Industries, Ltd., Osaka (Japan) | ||
| Filed on Apr. 12, 2006, as Appl. No. 11/402,271. | ||
| Claims priority of application No. P. 2005-116143 (JP), filed on Apr. 13, 2005. | ||
| Prior Publication US 2006/0275001 A1, Dec. 07, 2006 | ||
| Int. Cl. G02B 6/36 (2006.01) | ||
| U.S. Cl. 385—93 [385/53; 385/88; 385/92] | 17 Claims |
| 1. An optical subassembly mating with an optical connector that is attached to a tip of an optical fiber, comprising:
an optical receptacle securing a stub optically coupled with the optical connector, the stub providing a coupling fiber in
a center portion thereof;
an optical device including a semiconductor optical device, a stem for mounting the semiconductor optical device, and a lens
cap assembled with the stem, the lens cap securing a lens to couple the semiconductor optical device with the coupling fiber;
and
a joint sleeve for aligning the optical receptacle with the optical device,
wherein a distance between the semiconductor optical device and the lens is greater than a focal length of the lens and a
reference distance where a maximum coupling efficiency between the semiconductor optical device and the lens is achieved such
that a defocused distance between the coupling fiber and the lens is shorter than a distance when the semiconductor optical
device is set in the reference distance to get a predetermined optical output power from the optical subassembly.
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