Digital repeating installation

Patent

Digital repeating installation

- 19 Mar 1984

4

TL;DR: In this article, an optical signal is converted to an electric signal, amplified by an automatic gain control, waveform-equalized 4 and inputted to a discriminator 6, and ''1'' or ''0'' is decided in this discriminator.

Abstract: PURPOSE:To always execute an optimum discrimination/decision even if a characteristic of a device is varied, by measuring a code error rate of a repeating installation based on a code converting rule of a transmission line, and controlling automatically a discrimination/decision device so that the code error rate becomes the minimum. CONSTITUTION:An optical signal which has reached a repeating installation is converted 2 to an electric signal, amplified 3 by an automatic gain control, waveform-equalized 4 and inputted to a discriminator 6, and ''1'' or ''0'' is decided in this discriminator. An output of the discriminator 6 is divided into two, one is transferred to a light source 8, and the other is led to a code error detecting circuit 17. In the circuit 17, an error of a code of ''0'' and ''1'' is detected by utilizing a code converting rule, a parity check code, etc. contained in a transmission line code, and when an error of ''0'' and ''1'' is generated, an erroneous pulse is generated in terminals 21, 22, respectively. A control circuit 18 varies a voltage so that a discriminated and decided value Vth of the discriminator 6 becomes high or low in accordance with the erroneous pulse of a ''0'' code and a ''1'' code, and executes a control so that the code error rate always becomes the minimum.

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Citations

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Optical receiver for regeneration of optical signal

Satoshi Ide, +1 more

- 01 Jun 2009

TL;DR: An optical receiver includes a converting unit that converts an optical signal into an electrical signal, an amplifying unit that amplifies the electrical signal and a regenerating unit that regenerates the amplified electrical signal; a monitoring unit that performs monitoring of an optical current flowing through the converting unit; and a control unit that calculates a decision threshold based on a result of the correction as discussed by the authors.

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- 12 Apr 2004

TL;DR: In this article, an identification level control method and an optical receiver are disclosed to determine an optimal identification level in a simple structure without clock extraction, and an optimal level is computed based on the first identification level and the second identification level, and is supplied to the limiter amplifier.

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Light receiving device for optical communication system

Kenichi Nakamoto, +3 more

- 23 Nov 2004

TL;DR: In this paper, a light receiving device is disclosed by which can be used to improve the reception characteristics of light receiving system by using a photoelectric conversion element for receiving a light signal.

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Light receiving circuit

Satoshi Ide, +3 more

- 11 Oct 2005

TL;DR: In this article, the authors proposed an identification level for a wide receiving power range in a light receiving circuit, where the receiving data is reproduced from an optical input signal by a photodiode 12, a preamplifier 13, a limiter amplifier 14, an identifying/reproducing section 16 and an error correcting section 17.

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References

Patent

Data waveform shaping circuit

Oinuma Akira

- 22 Nov 1983

TL;DR: In this article, an automatic control of the slice level while monitoring the data error factor and securing the follow-up not only to the attenuation of a high band due to a pickup but to the variation of the DC component owing to the disk variance is presented.

...read moreread less

6

Patent

Data slice circuit

Shiromizu Masakazu

- 10 Jan 1983

TL;DR: In this article, the authors propose to attain stable operation against level fluctuation of an original signal, by setting a plurality of slice levels, and picking up the optimum data following to the change of data, and widening the cover range of a slice level to the original signal.

...read moreread less

4

Patent

Discriminating reproducing circuit

Minami Takatoshi

- 02 Jul 1982

TL;DR: In this paper, a common circuit for 2R discriminating reproducing as well as 3R discriminating reproduction to facilitate making a repeater into an IC, by switching the control signal level in the optical transmission system or the like, was proposed.

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