The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 1992
Filed:
Oct. 03, 1990
Haruo Fujiwara, Sagamihara, JP;
Mitsuo Kitamura, Kawasaki, JP;
Fujitsu Limited, Kanagawa, JP;
Abstract
An optical repeater includes a first converter converting an optical input signal into an electrical signal, an equalizing amplifier which amplifies the electrical signal and which outputs an amplified electrical signal, and a timing extraction circuit which extracts a timing signal from the amplified electrical signal. Also the optical repeater includes a phase inversion circuit which receives the amplified electrical signal in synchronism with the timing signal and which outputs a phase-inverted signal in synchronism with the timing signal. The phase-inverted signal has a phase opposite to a phase of the amplified electrical signal. Further, the optical repeater includes a second converter having a diffused laser diode and converting the phase-inverted signal into an optical output signal, and a supervisory signal extraction circuit which extracts a supervisory signal contained in the optical input signal from the phase-inverted signal. The optical input signal includes a digital signal formed of a plurality of blocks. Each block has data composed of (2m+1) bit (where m is an integer) and one-bit parity so that each block is formed of a (2m+1)B1P code having an even parity.