EP0138584A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Self referring type of optical communication system
Assignee: SASAKI, ISSEI
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Filing: 1984-10-11
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Granted: —
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Expires: 2004-10-11
Abstract
Abstract A self-referring type of optical communication system for a pulse code modulation optical system is such that when the presence or absence of pulses (Figure 1 A) forms a signal according to polarisation wave angles, reference is made to the polarisation wave angle of a pulse a predetermined number of bits earlier than the given pulse, and a pulse code is determined from whether or not these polarisation wave angles match.
Inventors
- 👤 Issei 15-402 Hanakawa-Chuo-Danchi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:24
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B14/00; H04B14/002; H04B14/008
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
68 words
A self-referring type of optical communication system for a pulse code modulation optical system characterised in that when the presence or absence of pulses forms a signal according to polarisation wave angles, reference is made to the polarisation wave angle of a pulse a predetermined number of bits earlier than a given pulse, and a pulse code is determined from whether or not these polarisation wave angles match.
Claim 2
Dependent Claim
68 words
A self-referring type of optical communication system for a pulse code modulation optical system characterised in that when the presence or absence of pulses forms a signal according to polarisation wave angles, reference is made to the polarisation wave angle of a pulse a predetermined number of bits earlier than a given pulse, and a pulse code is determined from whether or not these polarisation wave angles match.
Claim 3
Dependent Claim
20 words
A self-referring type of optical communication system as claimed in claim 1 characterised in that a multi-mode or single-mode fibre
Claim 4
Dependent Claim
13 words
or a polarised-wave preservation fibre is used as a communication medium (Figure 3B).
Claim 5
Dependent Claim
13 words
or a polarised-wave preservation fibre is used as a communication medium (Figure 3B).
Claim 6
Dependent Claim
29 words
A self-referring type of optical communication system as claimed in claim 1 or 2 characterised in that an optical delay module (6, 7) is used for making said reference.
Claim 7
Dependent Claim
32 words
A self-referring type of optical communication system as claimed in claim 3 characterised in that said optical delay module consists of a short optical fibre (6) and a long optical fibre (7).
Claim 8
Dependent Claim
40 words
A self-referring type of optical communication system as claimed in any preceding claim characterised in that optical interference between a given signal and a delayed signal is utilised in order to determine whether or not said polarisation wave angles match.
Claim 9
Dependent Claim
28 words
A self-referring type of optical communication system as claimed in any preceding claim characterised in that a predetermined optical delay time is used as a key for reproduction.
References Cited (Backward Citations)
No citation records indexed.
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