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Transmission system and test apparatus

A transmission system and electrical transmission technology, applied in the field of transmission systems and testing devices, can solve the problems of unstable operation of laser diodes, difficult to have the same cut-off frequency, and reduced transmission rate.

Inactive Publication Date: 2011-11-23
ADVANTEST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the cutoff frequency of optical fiber depends on the transmission distance, it is difficult to set the cutoff frequency of various elements of the transmission system to be approximately the same
When the cutoff frequency of various elements of the transmission system is significantly different, although the problem of unstable operation of laser diodes and the like can be solved by reducing the transmission rate by combining the lowest cutoff frequency, it is not a good thing to reduce the transmission rate

Method used

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  • Transmission system and test apparatus
  • Transmission system and test apparatus
  • Transmission system and test apparatus

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Embodiment Construction

[0029] One aspect of the present invention will be described below through specific embodiments, but the following embodiments do not limit the invention related to the claims. In addition, the combination of all the features described in the embodiments is not necessarily the solution means of the invention. have.

[0030] figure 1 It is a configuration example diagram of the transmission system 100 according to one embodiment. The transmission system 100 is a system for data transmission using optical transmission, and includes a signaling device 200 , a transmission channel 400 , and a receiving device 300 .

[0031] In addition, the transmission system 100 of this example transmits data with a narrower occupied bandwidth by using an amplitude multi-value modulation and demodulation method in the modulation and demodulation of transmission signals. For example, when data transmission of 10 Gbps is performed using a quaternary amplitude modulation scheme, data can be trans...

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Abstract

Provided is a transmission system for transmitting data, which comprises: a modulating unit that modulates the amplitude of a predetermined carrier signal in accordance with data to be transmitted; an electro-optic conversion unit that converts the modulated signal outputted by the modulating unit to an optical signal; an optical fiber used for transmitting the optical signal; an opto-electric conversion unit that converts the optical signal transmitted by use of the optical fiber to a current signal; a current-to-voltage conversion unit that linearly converts the current signal to a voltage signal; and a demodulating unit that demodulates the voltage signal.

Description

technical field [0001] In the US this application is a continuation-in-part of US application 12 / 339,075 (filed: December 19, 2008). Background technique [0002] Transmission systems for transmitting optical signals typically have laser diodes, optical fibers, and photodiodes. In addition, in the case of long-distance optical transmission, since a considerable loss occurs in the optical fiber, a compensation circuit for compensating the loss is often provided. In addition, even in the case of short-distance optical transmission, the frequency band of the compensation circuit is often used to compensate the operating frequency band of the laser diode and photodiode. [0003] prior art literature [0004] patent documents [0005] Since no prior art literature has been found so far, the description of the prior art literature is omitted. [0006] The problem the invention is intended to solve [0007] The compensation circuit uses the same method to perform compensation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/02H04B3/04H04B10/00H04B10/04H04B10/06H04B10/14H04B10/26H04B10/28H04L27/02H04B10/43
CPCH04B10/6932H04B10/6971H04L25/03012H04B10/152H04B10/07H04B10/25H04B10/2507H04L27/00
Inventor 渡边大辅冈安俊幸
Owner ADVANTEST CORP