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Data transmission through direct regulating intermediate infrared laser

A laser and infrared technology, applied in the direction of lasers, semiconductor lasers, laser components, etc., can solve problems such as hindering transmission and low output

Inactive Publication Date: 2002-09-11
LUCENT TECH INC +1
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Problems solved by technology

[0004] These conventional FSODT systems have several limitations
First, the system is based on near-infrared lasers, which must operate at limited power levels to ensure eye safety
Second, near-infrared lasers produce light at wavelengths that are high enough for atmospheric attenuation (i.e., absorption and scattering) to impede transmission
These complex transmitters are difficult to form monolithic devices, therefore, the yield of manufacturing such monolithic devices is very low

Method used

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  • Data transmission through direct regulating intermediate infrared laser
  • Data transmission through direct regulating intermediate infrared laser
  • Data transmission through direct regulating intermediate infrared laser

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Embodiment Construction

[0016] Quantum cascade (QC) lasers have properties that are beneficial for free-space optical transmitters. For example, QC lasers are mid-infrared lasers with high output power. Here, a mid-infrared (mid-IR) laser emits a wavelength in the range of about 3.5 microns to about 20 microns.

[0017] Various embodiments utilize these QC lasers, which emit wavelengths within a window where atmospheric absorption is very low. A low absorption window includes wavelengths in the range of about 8 microns to about 13 microns. Another low absorption window includes wavelengths in the range of about 3.5 microns to about 5 microns, wherein these wavelengths are not at CO at about 4.65 microns 2 absorption peak.

[0018] QC lasers can also be directly modulated at high frequencies. Here, direct modulation refers to modulation that changes the pumping of the laser between a value at which the laser has a high output power level and a value at which the laser has a low output power level....

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Abstract

A process for optically transmitting data to a remote receiver, comprising: receiving a stream of input data signals, and modulating a mid-infrared laser using a direct modulation method of a waveform whose sequential values ​​reflect the data signals in the stream. The direct modulation method involves pumping a mid-infrared laser to produce high and low optical power levels, which reflect different order values. The process also includes transmitting output light from the modulated mid-infrared laser to a remote receiver via a free-space communication channel.

Description

technical field [0001] The present invention relates to laser modulation and optical data transmission. Background technique [0002] In recent years, there has been a growing interest in free-space optical data transmission (FSODT) because the economic benefits of FSODT in dense urban areas are attractive. In these areas, the use of FSODT can avoid installing new cables or fibers. The cost of installing cable and fiber in urban areas is staggering. Instead of cables and optical fibers, FSODT communicates using free space, for example, the atmosphere between the roofs of buildings. However, this free-space transmission is sensitive to disturbances from atmospheric conditions, such as fog, pollution, and sediment. [0003] Conventional FSODT systems use near-infrared lasers with wavelengths around 1.55 microns to transmit data via free-space light. The NIR laser of a conventional FSODT transmitter has a continuous wave output that is modulated to introduce data before fre...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042H04B10/11H04B10/112H04B10/118H04B10/524H04B10/54H04B10/556
CPCH04B10/1121
Inventor 克莱德·G·比瑟飞德里科·卡帕瑟阿尔弗雷德·Y·周克莱尔·F·格马奇阿伯特·李·胡琴松莱诺·马丁罗伯特·派拉德伯拉·李·思乌克阿勒桑德罗·特里迪苏赛埃德瓦·A·维塔克
Owner LUCENT TECH INC
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