公开(公告)号：JP2000147294A

公开(公告)日：2000-05-26

申请号：JP32187799

申请日：1999-11-12

Applicant: LUCENT TECHNOLOGIES INC

Inventor： GIARETTA GIORGIO ,  WHITE WHITNEY

IPC: G02B6/32 ,  G02B6/02 ,  G02B6/34 ,  G02B6/42 ,  H04B10/02 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/18 ,  H04B10/2581 ,  G02B6/16

Abstract: PROBLEM TO BE SOLVED: To enable the transmission of light signals on a polymer fiber by coupling a light signal spot through a central region to the predetermined central region of the core region of the polymer fiber exhibiting a nearly flat delay characteristic. SOLUTION: A light signal source 101 is coupled through a lens 202 to the sweat spot 203 of the core 107a of the polymer fiber 107. For example, the sweat spot of the polymer fiber having the core of, for example, about 250 μm in diameter is about 120 μm and is, therefore, extremely larger than the core diameter of 50 μm of the SM fiber 104. The lens 202 is, therefore, relieved of the alignment and focusing to the PF fiber 107. The sweat spot of 120 μm extends to half the core diameter and, therefore, even if the light signal is offset somewhat (about 50 μm) from the center, the transmission capacity remains high. In such a case, the system may be used an avalanche photodiode detector(APD) having the embedment lenses as a lens 209 and a detector 211 in, for example, a signal receiver 210.

公开(公告)号：CA2282971A1

公开(公告)日：2000-05-12

申请号：CA2282971

申请日：1999-09-22

Applicant: LUCENT TECHNOLOGIES INC

Inventor： WHITE WHITNEY ,  GIARETTA GIORGIO

IPC: G02B6/32 ,  G02B6/02 ,  G02B6/34 ,  G02B6/42 ,  H04B10/02 ,  H04B10/12 ,  H04B10/135 ,  H04B10/14 ,  H04B10/18 ,  H04B10/2581

Abstract: We have determined that unlike the most multimode silica fiber, multimode polymer fiber often exhibits a delay characteristic that has a broad low dispersion region where propagation delay of spatially restricted optical pulses remains relatively constant. This low dispersion region is centered around the center axis of the fiber core as a function of launch position. By directing a transmitted optical pulse to this region, we have determined that optical pulse dispersion can be significantly reduced without the need for using the prior art technique of using a single mode fiber spliced in series with the multimode fiber to reduce dispersion. A polymer fiber based optical transmission system using this arrangement exhibits relaxed alignment tolerances between the optical source and polymer fiber, while reducing dispersion and increasing bandwidth-length product.