| US 7,477,815 B2 | ||
| Multi-mode fiber, optical fiber transmission system with offset-launch, single-mode, long-wavelength, vertical cavity surface emitting laser transmitter | ||
| David Jenkins, Suffolk (United Kingdom); and Christopher Park, Suffolk (United Kingdom) | ||
| Assigned to OCP-Europe, Ltd, Edmunds, Suffolk (United Kingdom) | ||
| Filed on Apr. 23, 2007, as Appl. No. 11/738,587. | ||
| Application 11/738587 is a division of application No. 10/851484, filed on May 22, 2004, granted, now 7,231,114. | ||
| Prior Publication US 2008/0131051 A1, Jun. 05, 2008 | ||
| Int. Cl. G02B 6/42 (2006.01) | ||
| U.S. Cl. 385—31 [385/33; 385/39; 372/103] | 15 Claims |
| 1. A transmitter optical subassembly for use in a multimode fiber communication system, said transmitter optical subassembly
comprising:
a receptacle for receiving a multimode optical fiber; and
a transmitter assembly including
an optical source comprising a single mode, long wavelength vertical cavity surface emitting laser outputting optical radiation
in a substantially circular beam spot,
said laser having a symmetric numerical aperture of about 0.1 and a beam spot diameter of between about 3 μm to about 10 μm,
and
a collecting element for collecting said optical radiation output from the laser,
said receptacle and said transmitter assembly being received in assembled relation such that said laser and said collecting
element are cooperatively positioned to direct said optical radiation onto the core of a multimode fiber offset from the optical
axis of said core of said multimode fiber when a transmitting end of said multimode fiber is received in said receptacle.
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