IP Library › Granted Patent US 7,536,113
Granted Patent B2
US 7,536,113 · App. 11/037,718 · Granted May 19, 2009

Chirp managed directly modulated laser with bandwidth limiting optical spectrum reshaper

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Quick Facts
Patent No.
US 7,536,113
App. No.
11/037,718
Granted
May 19, 2009
Kind
B2
Abstract

A fiber optic communication system, comprising: an optical signal source adapted to produce a frequency modulated signal; and an optical spectrum reshaper adapted to receive the frequency modulated signal and output a substantially amplitude modulated signal; wherein the optical spectrum reshaper limits the bandwidth of the frequency modulated signal.

Claims (12)

1. A fiber optic communication system, comprising:

an optical signal source adapted to produce a frequency modulated signal; and

an optical spectrum reshaper adapted to receive the frequency modulated signal and output a substantially amplitude modulated signal;

wherein the optical spectrum reshaper limits the bandwidth of the frequency modulated signal; and

wherein the 3 dB bandwidth of the optical spectrum reshaper is less than 2 times the bit rate of the frequency modulated signal.

2. A fiber optic system according to claim 1 wherein the optical spectrum reshaper is a band pass filter.

3. A fiber optic system according to claim 1 wherein the wavelength of the frequency modulated signal is shifted relative to the peak transmission of the optical spectrum reshaper.

4. A fiber optic system according to claim 1 wherein the bandwidth of the optical spectrum reshaper is adapted to reduce the bit error rate sensitivity of the signal to a desired level after propagation through fiber.

5. A fiber optic system according to claim 1 wherein the bandwidth of the optical discriminator is larger than ½ times and less than 2 times the bit frequency of the modulated signal.

6. A fiber optic system according to claim 1 wherein the optical signal source is a directly modulated laser.

7. A fiber optic system according to claim 6 wherein the bandwidth of the optical spectrum reshaper is adapted to reduce the transient relaxation oscillations in the frequency modulated signal.

8. A fiber optic system according to claim 6 wherein the bandwidth of the optical spectrum reshaper is adapted to reduce the transient chirp in the frequency modulated signal.

Assignments (7)
PATENT RELEASE AND REASSIGNMENT Recorded Jul 5, 2022
From: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
To: II-VI INCORPORATED; MARLOW INDUSTRIES, INC.; EPIWORKS, INC.; LIGHTSMYTH TECHNOLOGIES, INC.; KAILIGHT PHOTONICS, INC.; COADNA PHOTONICS, INC.; OPTIUM CORPORATION; FINISAR CORPORATION; II-VI OPTICAL SYSTEMS, INC.; M CUBED TECHNOLOGIES, INC.; II-VI PHOTONICS (US), INC.; II-VI DELAWARE, INC.; II-VI OPTOELECTRONIC DEVICES, INC.; PHOTOP TECHNOLOGIES, INC.
Reel/Frame 060574/0001 →
SECURITY INTEREST Recorded Jul 1, 2022
From: II-VI INCORPORATED; II-VI DELAWARE, INC.; M CUBED TECHNOLOGIES, INC.; II-VI PHOTONICS (US), INC.; PHOTOP TECHNOLOGIES, INC.; COHERENT, INC.
To: JPMORGAN CHASE BANK, N.A., AS COLLATERAL AGENT
Reel/Frame 060562/0254 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Apr 1, 2020
From: FINISAR CORPORATION
To: II-VI DELAWARE, INC.
Reel/Frame 052286/0001 →
NOTICE OF GRANT OF SECURITY INTEREST IN PATENTS Recorded Sep 25, 2019
From: II-VI INCORPORATED; MARLOW INDUSTRIES, INC.; EPIWORKS, INC.; LIGHTSMYTH TECHNOLOGIES, INC.; KAILIGHT PHOTONICS, INC.; COADNA PHOTONICS, INC.; OPTIUM CORPORATION; FINISAR CORPORATION; II-VI OPTICAL SYSTEMS, INC.; M CUBED TECHNOLOGIES, INC.; II-VI PHOTONICS (US), INC.; II-VI DELAWARE, INC.; II-VI OPTOELECTRONIC DEVICES, INC.; PHOTOP TECHNOLOGIES, INC.
To: BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 050484/0204 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 19, 2008
From: AZNA LLC
To: FINISAR CORPORATION
Reel/Frame 021119/0751 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 16, 2007
From: MATSUI, YASUHIRO; TAYEBATI, PARVIZ
To: AZNA LLC
Reel/Frame 019592/0336 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 16, 2007
From: WALKER, DUNCAN
To: AZNA LLC
Reel/Frame 019765/0151 →