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Driving mechanism of light transmitter

A driving device, optical transmitter technology, applied in electromagnetic transmitters, lasers, phonon exciters, etc., can solve problems such as unsatisfactory operation

Active Publication Date: 2008-05-07
HONG KONG APPLIED SCI & TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional modulated drivers are not satisfactory for operation above room temperature (eg, above 70°C), and are not satisfactory for operation over a wide temperature range (eg, from room temperature to 125°C). satisfying

Method used

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  • Driving mechanism of light transmitter
  • Driving mechanism of light transmitter
  • Driving mechanism of light transmitter

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Embodiment Construction

[0033] Optical transmitter is a key component in optical communication system. A typical optical transmitter includes a light source, such as a light emitting diode (LED) source or a laser source. The light output of the light source is usually modulated to send an encoded digital signal.

[0034] When the operating environment temperature is higher than room temperature, for example, higher than 50°C, the performance of the traditional optical fiber communication system degrades rapidly. This is unacceptable because fiber optic systems are often used in harsh conditions, such as in deserts and in automotive applications, which require stable system performance over a wide temperature range (eg, 0°C-125°C).

[0035] It will be appreciated that the performance characteristics of conventional modulation drives at elevated temperatures contribute at least to the degradation of the performance of the optical system. Curve 110 in FIG. 2 shows the modulation current amplitude vers...

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Abstract

A modulation driver (310) for delivering an output modulation current (250) for driving an optical source (320) of an optical transmitter (300), the output modulation current (250) comprises a first modulation current region (130) characterised with a first temperature gradient and a second modulation current region (140) characterised with a second temperature gradient, said first modulation current region (130) and said second modulation region (140) being for delivering modulation current at a first temperature range and a second temperature range, temperatures of said second temperature being higher than temperatures of said first temperature range, said second temperature gradient being larger than said first temperature gradient.

Description

field of invention [0001] The invention relates to optical signal generation, in particular to a modulation drive device for an optical transmitter light source. More particularly, although not exclusively, the present invention relates to modulated drive arrangements for laser light sources used in optical communications. Background of the invention [0002] Fiber optic transmitters and transceivers are widely used in data communication and telecommunications applications. In a typical optical signal transmitter, a light source, such as a laser source, is biased with a constant bias current (bias current) at an average optical power point. In order to decode data for transmission, the bias current is typically modulated around this bias point. In most optical communication applications, a binary modulation corresponding to a logic high "1" or logic low "0" is usually used. In particular, the signal information is transmitted by a pulse stream comprising "on" and "off" pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/155H04B10/04H01S3/10H04B10/28H04B10/50
CPCH01S5/042H04B10/504
Inventor 托斯腾·威匹耶斯基
Owner HONG KONG APPLIED SCI & TECH RES INST