06661503 is referenced by 22 patents and cites 1 patents.

A method of manufacturing an optic transmission module assures a high reliability for the module by inspecting the character of a low bit error rate (BER) of the module quickly and accurately. The module is employed in an optical communication system (light transmission system) required to cope with information communication systems that are becoming faster and faster in operation and larger and larger in capacity. Also disclosed is a system and a method for inspection of the BER character which uses a rectangular wave pulse as an interference light to calculate a degradation quantity of a signal-to-noise ratio (S/N) on the basis of a simple theory, thereby inspecting the BER character by extrapolating a case in which there is no interference light (S/X=∞ or X=0) with use of a sign error rate theoretical value according to a bit error rate of a light signal measured according to the degradation quantity.

Title
Method for manufacturing optic transmission modules and system for inspecting bit error rate characters
Application Number
9/485723
Publication Number
6661503 (B1)
Application Date
May 12, 2000
Publication Date
December 9, 2003
Inventor
Kazuo Aoyama
Tokyo
US
Kyouichi Yamamoto
Yokohama
US
Kazumi Kawamoto
Yokohama
US
Tsutomu Yoshiya
Yokohama
US
Naohiko Baba
Yokohama
US
Atsushi Murata
Yokohama
US
Shinzoo Nishiyama
Yokohama
US
Takashi Minato
Yokohama
US
Kazuo Yamaguchi
Yokohama
US
Agent
Antonelli Terry Stout & Kraus
US
Assignee
Hitachi
US
IPC
G01N 21/00
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