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Optical transmission using semiconductor optical amplifiers (soas)

A semiconductor and laser technology, applied in the field of QUENCYDI, which can solve problems such as signal distortion

Inactive Publication Date: 2017-04-26
FINISAR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 amplifiers (soas)
  • Optical transmission using semiconductor optical amplifiers (soas)
  • Optical transmission using semiconductor optical amplifiers (soas)

Examples

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Embodiment Construction

[0044] 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.

[0045] 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. For example, when the threshold current is increased from 7mA to 9mA, the wavelength of the laser shifts b...

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PUM

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Abstract

The invention relates to a fiber optic communication system comprising an optical signal source adapted to receive a binary base signal having a bit period T, and generate a first signal, wherein the first signal is frequency modulated. According to the invention, the system comprises an optical spectrum reshaper (OSR) adapted to reshape the first signal into a second signal, wherein the second signal has an amplitude modulated component and a frequency modulated component, wherein the optical signal source comprises a laser, and wherein the frequency modulation is generated by modulating a phase of a laser cavity of the laser.

Description

[0001] Cross References to Related Applications [0002] This patent application: [0003] (i) No. 11 / 272, 100, filed by Daniel Mahgerefteh on 11 / 08 / 2005 entitled "POWERSOURCE FOR ADISPERSION COMPENSATION FIBER OPTIC SYSTEM" (attorney case No. TAYE-59474-00006CON) A continuation-in-part of a U.S. patent application; [0004] (ii) No. 10 / 308,522 filed by Daniel Mahgerefteh on 12 / 03 / 2002 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 pending prior U.S. Patent No. 11 / 441,944, filed 05 / 26 / 2006 by Daniel Mahgerefteh et al., entitled "FLATDISPERSIONFREQUENCY DISCRIMINATOR (FDFD)" (Attorney Docket No. TAYE-59474-00009CON) Part of the application continues with the application; [0006] (iv) No. 11 / 037,718, filed by Yasuhiro Matsui et al. continuation-in-part of a patent application; [0007] (v) is the pending prior U...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/07H04B10/2513H04B10/516H04B10/54H04B10/556
CPCH04B10/25137H04B10/516H04B10/5161H04B10/541H04B10/5563H04B2210/517
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