Optical Fiber Depolarizers
All-fiber depolarizers applicable to a wide range of sources


_FEATURES _EXAMPLE APPLICATIONS
____•  Low DOP ____•  Optical source polarization randomization
____•  Low insertion loss ____•  Raman amplifier pump laser
____•  Near zero back reflection ____•  EDFA pump laser
____•  All-fiber construction ____•  ASE, SLD and ELED sources
____•  Wide wavelength operating range ____•  Polarization measurement systems
____•  Passive operation ____•  Fiber optic gyroscopes
____•  Rugged packaging ____•  Optical fiber sensor systems

LYOT DEPOLARIZER
The Phoenix Photonics depolarizer is an all-fiber Lyot type device producing pseudo-random polarization output, with low degree of polarization (DOP), for any input state of polarization (SOP).

The depolarizer is a passive device utilizing the coherence properties of the source to randomize the SOP. For optimum performance the depolarizers are designed to match the source spectrum and the range of Phoenix depolarizers will meet the differing requirements of optical sources from broadband ASE’s to high power amplifier pump lasers.

DEPOLARIZER OPTIONS
• The standard depolarizer can be spliced
or connected into a SM fiber system converting any arbitrary SOP to a depolarized output.
• Designed specifically for Raman amplifier
pump applications, this compact version of the  depolarizer has a PM fiber input for direct connection to the laser PM fiber pigtail.
• Also, available with integrated polarizer to
‘clean up’ the input polarization, this device provides excellent PDG performance for Raman amplifiers.


_SPECIFICATIONS
Wavelength range 1
980nm
1280nm – 1625nm
Operational bands 1
980nm
1300nm, 14XX, S,C,L
Residual extinction ratio 2
<0.2 dB
<0.2dB
Degree of Polarization 3
<5%
<5%
Insertion loss 4
<1dB
<1dB
Return loss 5
>70dB
Source linewidth 6
>0.1nm
Operating temperature range 7
-5ºC to 70ºC
Transportation/storage 8
-40ºC to 85ºC
Input Fiber type
Corning Puremode HI 1060
SMF28(SM) PANDA (PM)
Output Fiber type
Corning Puremode HI 1060
SMF28(SM) PANDA (PM)
Pigtails
1m fiber standard, 900um loose tube optional

_DEPOLARIZER OPTIONS
State of Polarization input
Arbitrary
Linear
Linear
Integrated Polarizer
No
No
Yes
Wavelength ranges (nm)
980, 1280-1625
1280-1625
1280-1625
Insertion Loss (dB)

BB
LS
RM

-
<1
<2
<1
-
<1
<2
<1
-
<1.5
<2.5
<1.5
Input Fiber
SM
PM
PM
Output Fiber
SM
SM
SM
Dimensions (mm) LxWxH___BB
LxWxH___LS
LxWxH___RM
Dimensions (mm)
150x95x10
215x106x35
N/A
Dimensions (mm)
150x95x10
215x106x35
N/A
Dimensions (mm)
150x95x10
165x108x35
150x95x10


All dimensions are approximate and may vary slightly.

Notes to Specifications

_• All specifications are worst case for the
_• wavelength range selected; actual products
_• commonly exhibit better specification.
_• All depolarizers are individually tested.

1. The devices will provide depolarization over a wide wavelength range for which the fiber is single mode. Performance characteristics are wavelength dependent and the devices will meet specification as follows:
_• Type 15 – 1530nm to 1625nm
_• Type 14 – 1420 nm to 1530 nm
_• Type 13 – 1280nm to 1320nm
_• Type 09 – 980nm

2. The residual extinction ratio (RER) is measured for each device during manufacture to ensure specification.

3. The DOP varies with wavelength increasing at longer wavelengths. Across the specified band the DOP is within 5%.

4. Insertion loss is typically 0.7dB without integrated polarizer and 1dB with the polarizer. The insertion loss excludes connector losses.

5. The all-fiber technology gives an excellent return loss figure of >70dB.

6. The DOP for a Lyot depolarizer is dependent upon the source spectrum, the model options are shown below, please confirm selection with our sales representative.

BB – Broadband sources such as ASE, SLD, ELED
LS – Laser sources with linewidths from 0.1nm
RM – Raman pump source laser

7. The operating temperature range is specified for typical telecommunications operation. Please discuss with the sales representative if operation outside the specified range is required.

8. The devices are very robust for storage and transportation.

PRODUCT ORDERING INFORMATION
Note: Not all options below are available in all depolarizer types, please check with our
sales representative to ensure your specific requirements can be met.


Download spec sheet as a pdf file

U6 Vulcan House, Restmor Way, Wallington, Surrey SM6 7AH UK
T: +44 (0)20 8669 8559 F: +44 (0)20 8669 7667
E: sales@phoenixphotonics.com