公开(公告)号：CA2312960A1

公开(公告)日：1999-06-17

申请号：CA2312960

申请日：1998-12-03

Applicant: CORNING INC

Inventor： HANSON THOMAS A ,  SOULLIERE MARK J

IPC: G02F1/35 ,  H04B10/00 ,  H04J14/08

Abstract: An all optical add-drop multiplexer (ADM) includes nonlinear optical loop mirrors (NOLMs) (302, 304) having signal input (I1), gating input (G1), through output (T1) and drop output (D1) ports. A stream of soliton pulses coupled to the gate input (G1), synchronized with soliton signal pulses coupled to the signal input (I1), directs the signal pulses to the drop output (D1) or to the thro output (T1), depending upon the presence or abscence of solitons in the gate signal. Operations such as logic INVERSION and logic AND are effected by the NOLMs (302, 304) and signals may be added through a combination of operations equivalent to a logic "OR". Such combinations are employed to produce one or more drops and one or more adds in an add-drop multiplexer.

公开(公告)号：AU1621699A

公开(公告)日：1999-06-28

申请号：AU1621699

申请日：1998-12-03

Applicant: CORNING INC

Inventor： HANSON THOMAS A ,  SOULLIERE MARK J

IPC: G02F1/35 ,  H04B10/00 ,  H04J14/08

公开(公告)号：CA2135588A1

公开(公告)日：1995-07-01

申请号：CA2135588

申请日：1994-11-10

Applicant: CORNING INC

Inventor： HANSON THOMAS A

IPC: G01M11/00 ,  H04B10/18

Abstract: Methods for determining optical properties of an optical waveguide fiber using an optical time domain reflectometer (OTDR) are provided. The methods involve the removal of noise from an OTDR trace (signal) by fitting the noise component of the signal and then subtracting the fitted noise from the original signal to produce a noise-reduced signal. Optical properties are more readily determined from the noise-reduced signal than from the original signal. In particular, the noisereduced signal can be used to determine axial optical properties of long fibers, e.g., fibers having a length of 50 kilometers or more.