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
  • FBG for 980nm pump laser is used to lock 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 -25dB to -30dB by apodization, better than the industry standard

 

Specifications

  • Specifications 1:

Product Type

AFBG-PMF/SMF-974

Parameters

Minimum

Typical

Maximum

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

973.75

974.00

974.25

Peak Reflectivity @ λc (%)*

1.5

2.0

2.5

Reflectivity Bandwidth (FWHM) (nm)*

0.4

0.5

0.6

Side Lobe Suppression Ratio Compound (SLSR) (dB)

-

-

-25

Proof Test Level (>8 sec pull test) (kpsi)

150

-

-

Bending Radius (mm)

15

-

-

Operating Temperature Range (℃)

-20

-

75

Change of Central Wavelength with Temperature (nm/K)

0.01

Grating Region Length (mm)

50

Grating Type

Apodized

Fiber Type

PMF/SMF

Maximum Pump Power Through the Grating (W)

1

FBG Length (m)

3 - 4 or As Requested

 

  • Specifications 2:

Product Type

AFBG-PMF/SMF-976
Parameters Minimum

Typical

Maximum

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

975.85

976.00

976.15

Peak Reflectivity @ λc (%)*

2.5

3.0

3.5

Reflectivity Bandwidth (FWHM) (nm)*

0.60

0.65

0.7

Side Lobe Suppression Ratio Compound (SLSR) (dB)

-

-

-25

Proof Test Level (>8 sec pull test) (kpsi)

150

-

-

Bending Radius (mm)

15

-

-

Operating Temperature Range (℃)

-20

-

75

Change of Central Wavelength with Temperature (nm/K)

0.01

Grating Region Length (mm)

50

Grating Type

Apodized

Fibre Type

PMF/SMF

Maximum Pump Power Through the Grating (W)

1

FBG Length (m)

3 - 4 or As Requested

*①Centre wavelength λc are available as requested from 973nm to 976nm.
*②Peak reflectivity @λc are available as requested from 0.5% to 10%.
*③Reflectivity bandwidth(FWHM) are available as requested from 0.1nm to 1.0nm.

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