Stock Code:601869.SH / 06869.HK

FBG for 980nm Pump Laser

The Fibre Bragg Grating (PMFBG/SMFBG) for 980nm pump laser is written by UV light within the PM980 polarization maintaining fibre (PMF) or SM980 single mode fibre (SMF) core. The PMFBG/SMFBG as pigtail is connected to the 980nm pump laser diode, providing external cavity feedback, which make the pump laser wavelength locked at the center wavelength of PMFBG/SMFBG. Due to the low temperature sensitivity of FBG, the stability of 980nm pump laser wavelength can be greatly improved, and the temperature control of 980nm pump laser is unnecessary. As the PMFBG/SMFBG narrows the bandwidth of the 980nm pump laser output, the ratio of the output power within the erbium ion absorption band can be increased , thereby increasing the efficiency and the stability of the EDFA pump.
Applications
  • PMFBG/SMFBG for 980nm pump laser is used for locking of output wavelength. Due to the low temperature sensitivity of FBG, the stability of output wavelength and the efficiency of 980nm pump laser can be greatly improved
Characteristics
  • High–precision control of the reflective wavelength, within ±0.25nm
  • High-precision control of the reflectivity, within ± 0.5%
  • Side lobe suppression ratio up to -25 to -30dB by apodization, better than the industry standard
  • PMFBG is better than SMFBG at extinction ratio and locking of output wavelength. With the enhancement of EDFA power, the output spectrum of the pumped laser using PMFBG is more stable, which makes the gain of EDFA more stable

 

Specifications

Specifications 1:

Product Type

AFBG-PMF/SMF-974

Parameter

Min

Typical

Max

Unit

Centre Wavelength λc@ 25 °C (measured“in air”)

973.75

974

974.25

nm

Peak Reflectivity @ λc

1.5

2

2.5

%

Reflectivity Bandwidth (FWHM)

0.4

0.5

0.6

nm

Side Lobe Suppression Ratio Compound (SLSR)

-

-

-25

dB

Proof Test Level (>8 sec pull test)

150

-

-

kpsi

Bending Radius

15

-

-

mm

Operating Temperature Range

-20

-

75

Shift in λc Over Temperature

0.01

nm/K

Grating Region Length

50

mm

Grating Type

Apodized

-

Fibre Type

PMF/SMF

-

Maximum Pump Power Through the Grating

1

W

Fbg Length

3m - 4m or As requested

-

Specifications 2:

 

Product Type

AFBG-PMF/SMF-976

Parameter

Min

Typical

Max

Unit

Centre Wavelength λc@ 25 °C (measured“in air”)

975.85

976

976.15

nm

Peak Reflectivity @ λc

2.5

3

3.5

%

Reflectivity Bandwidth (FWHM)

0.6

0.65

0.7

nm

Side Lobe Suppression Ratio Compound (SLSR)

-

-

-25

dB

Proof Test Level (>8 sec pull test)

150

-

-

kpsi

Bending Radius

15

-

-

mm

Operating Temperature Range

-20

-

75

Shift in λc Over Temperature

0.01

nm/K

Grating Region Length

50

mm

Grating Type

Apodized

-

Fibre Type

PMF/SMF

-

Maximum Pump Power Through the Grating

1

W

Fbg Length

3m -  4m or As requested

-

Note: 1. Centre wavelength λc are available as requested from 973nm to 976nm

          2. Peak reflectivity @λc are available as requested from 0.5% to 10%

          3. Reflectivity bandwidth(FWHM) are available as requested from 0.1nm to 1.0nm

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