Patent ID: 7477815

Claim:
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.