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Optical transmission using semiconductor optical amplifier (SOA)

A technology of optical amplifiers and semiconductors, applied in the field of frequency modulation of laser diodes, chirp management and direct modulation of lasers, which can solve problems such as signal distortion

Inactive Publication Date: 2009-10-21
FINISAR
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, directly modulated lasers (DMLs) typically reach less than 5 km, since their inherent time-dependent chirp causes severe distortion of the signal after this distance

Method used

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  • Optical transmission using semiconductor optical amplifier (SOA)
  • Optical transmission using semiconductor optical amplifier (SOA)
  • Optical transmission using semiconductor optical amplifier (SOA)

Examples

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Embodiment Construction

[0061] Intracavity loss modulation and / or intracavity phase modulation to improve signal transmission

[0062] figure 2 A preferred embodiment of the invention is shown in which an electroabsorption (EA) modulator is integrated inside a distributed Bragg reflector (DBR) laser cavity. The EA section is reverse biased. Applying a reverse bias voltage to the EA increases cavity losses, which increases the threshold gain for lasing. This increases the threshold carrier density, which results in a blue shift of the lasing frequency, ie provides frequency modulation.

[0063] by reference image 3 , to be able to understand the larger FM efficiency produced by loss modulation, image 3 Lasing wavelength is shown as a function of current injected into a traveling wave (CW) laser. It is known that the laser wavelength of a CW semiconductor laser depends on a threshold current. When more carriers are injected into the laser below the threshold, the wavelength is blue-shifted. ...

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PUM

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Abstract

A fiber optic communication system comprising: an optical signal source adapted to receive a binary first signal and generate a binary second signal, wherein the binary first signal has an amplitude modulated component, wherein the binary second signal has an amplitude modulated component and a frequency modulated component, and further wherein the binary second signal is characterized in that the higher intensity 1 bits are red shifted relative to the lower intensity 0 bits; a semiconductor optical amplifier (SOA) adapted to receive the binary second signal and generate a binary third signal, wherein the binary third signal has an amplitude modulated component and a frequency modulated component, and further wherein the semiconductor optical amplifier operates in saturation; and an optical spectrum reshaper (OSR) adapted to reshape the binary third signal into a binary fourth signal, wherein the binary fourth signal has an amplitude modulated component and a frequency modulated component. A method for transmitting a signal, comprising: receiving a binary first signal having an amplitude modulated component and generating a binary second signal having an amplitude modulated component and a frequency modulated component, wherein the binary second signal is characterized in that the higher intensity 1 bits are red shifted relative to the lower intensity 0 bits; passing the binary second signal through a semiconductor optical amplifier (SOA) operating in saturation so as to generate a binary third signal, wherein the binary third signal has an amplitude modulated component and a frequency modulated component; and reshaping the binary third signal into a binary fourth signal, wherein the binary fourth signal has an amplitude modulated component and a frequency modulated component.

Description

[0001] priority statement [0002] This patent application: [0003] (i) No. 11 / 272,100 filed by Daniel Mahgerefteh on 11 / 08 / 05 entitled "POWER SOURCEFOR A DISPERSION COMPENSATION FIBER OPTIC SYSTEM" (attorney case No. TA YE-59474-00006CON) under trial A continuation-in-part of an earlier U.S. patent application; [0004] (ii) No. 10 / 308,522 filed by Daniel Mahgerefteh on 12 / 03 / 02 entitled "HIGHSPEEDTRANSMISSION SYSTEM COMPRISING A COUPLED MULTI-CAVITYOPTICAL DISCRIMINATOR" (Attorney Case No. TAYE-59474-00007) A continuation-in-part of an earlier U.S. patent application; [0005] (iii) is a prior U.S. trial No. 11 / 441,944 filed on 05 / 26 / 06 entitled "FLAT DISPERSIONFREQUENCY DISCRIMINATOR (FDFD)" (Attorney Docket No. TAYE-59474-00009CON) continuation-in-part of a patent application; [0006] (iv) No. 11 / 037,718 filed by Yasuhiro Matsui on 01 / 18 / 05 entitled "CHIRP MANAGEDDIECTLY MODULATED LASER WITH BANDWITH LIMITING OPTICALSPECTRUM RESHAPER" (attorney case No. TAYE-26) is the...

Claims

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Application Information

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IPC IPC(8): H04B10/08H04B10/2513H04B10/516H04B10/54H04B10/556
CPCH04B10/25137H04B10/516H04B2210/517H04B10/5161H04B10/541H04B10/5563
Inventor 松井康浩丹尼尔·马格雷夫特郑学彦凯文·麦卡利翁帕维兹·塔耶巴蒂
Owner FINISAR
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