High-speed multi mode fiber optic link

• US 6,510,265 B1
• Filed: 04/20/2000
• Issued: 01/21/2003
• Est. Priority Date: 04/21/1999
• Status: Expired due to Term

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: White, Ian A, Ritger, Albert John, Nuss, Martin C, Kolesar, Paul Francis, Golowich, Steven Eugene, Giaretta, Giorgio
• Primary Examiner(s): Ullah, Akm E.
• Assistant Examiner(s): Rahll, Jerry T
• Application Number:
  US09/552,773
• Time in Patent Office: 1,006 Days
• Field of Search: 385/31, 385/33-35, 385/38
• US Class Current: 385/38
• CPC Class Codes: G02B 6/32 having lens focusing means positioned between opposed fibre ends with lens being an integral part of the single fibre end G02B6/262
• CPC Class Codes: G02B 6/4206 Optical features G02B6/4207, G02B6/421 take precedence

Abstract

A method and apparatus for overcoming modal noise penalties associated with multi-mode fiber optic links operating at high data rates on the order of 10 Gb/s. The method involves restricting the center launch condition of optical signals into the multi-mode fiber while permitting loose tolerances between source and fiber.

Claims

1. A method of sending data at data rates of approximately 10 Gb/s over multi-mode fiber CHARACTERIZED BY

restricting a center launch condition of optical signals injected into the multi-mode fiber such that modal noise penalties associated with multi-mode fiber optic links operating at such high data rates are reduced, and FURTHER CHARACTERIZED IN THAT said multi-mode fiber has a Full Width Half Maximum (FWHM) differential mode delay (DMD) impulse response that is less than a predetermined maximum when measured from the center of the core of said multi-mode fiber to a specified radius,

wherein said predetermined maximum is approximately 91 ps.