Phoenix Couplers

Standard Optical Fiber Depolarizers

Link to Raman Pump Laser Depolarizer

Link to High Grade 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

Integrated Polarizer

Yes

Wavelength ranges (nm)

980, 1280-1625

1280-1625

Insertion Loss (dB)

BB
LS
RM

-
<1
<2
<1

-
<1.5
<2.5
<1.5

Input Fiber

Output Fiber

Dimensions (mm) LxWxH___BB
LxWxH___LS
LxWxH___RM

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.

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Raman Pump Laser Depolarizer

_FEATURES

____• Low DOP

____• Low insertion loss

____• Near zero back reflection

____• All-fiber construction

____• 14XX operation

____• Passive operation

____• Rugged packaging

____• Integrated polarizer option

The Phoenix Photonics Raman pump laser depolarizer is an all-fiber device producing pseudo-random polarization output, with low degree of polarization (DOP).

Designed specifically to meet the requirements of PDG reduction in Raman Amplifiers, this depolarizer can be spliced directly to the laser or to the polarization multiplexer PM fiber pigtail.

A single unit will depolarize at any of the 14XX pump wavelengths.

DEPOLARIZER OPTIONS

The standard device has a polarization maintaining (PM) fiber input and depolarizes separate laser sources input to the fast and the slow axes of the fiber. When used following a polarization multiplexer, both polarization modes are depolarized providing an even power distribution from both fiber axes.

An integrated polarizer option is available for use directly from the pump laser to ‘clean up’ the linear SOP from the laser to improve depolarizer stability.

_SPECIFICATIONS
Wavelength range ¹	1420nm to 1500nm
Residual extinction ratio ²	<0.2 dB
Degree of Polarization ³	<5%
Insertion loss ⁴	<1dB (<1.5dB with polarizer)
Return loss ⁵	>70dB
Operating temperature range ⁶	-5ºC to 70ºC
Transportation/storage ⁷	-40ºC to 85ºC
Input Fiber type	Corning Puremode PANDA 400mm coating
Output Fiber type	Corning SMF 28
Pigtails	1m fiber standard, 900um loose tube optional
Dimensions	150x95x10 mm

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.
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.
5.	The all-fiber technology gives an excellent return loss figure of >70dB.
6.	The operating temperature range is specified for typical telecommunications operation.
7.	The devices are very robust for storage and transportation.

PRODUCT ORDERING INFORMATION:

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High Grade Fiber Optic Depolarizers

_FEATURES	_EXAMPLE APPLICATIONS
____• Extremely Low DOP	____• Optical source polarization randomization
____• Low insertion loss	____• ASE, SLD and ELED sources
____• Near zero back reflection	____• Polarization measurement systems
____• All-fiber construction	____• Fiber optic gyroscopes
____• Wide wavelength operating range	____• 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.

HIGH PERFORMANCE DEPOLARIZER RANGE
There are two options within the high performance range of depolarizers, both offering superior specification to the standard range of depolarizers. Targeted at measurement applications in which the lowest possible degree of polarization is required, these wideband devices are designed to operate over a large bandwidth of telecommunications wavelengths and provide either <0.25% (option 1) or <1% (option 2) DOP. For specific requirements outside the specification range below, please contact us.

_SPECIFICATIONS
Grade	1	2
Wavelength range¹	1280nm – 1640nm
Residual extinction ratio²	<0.02 dB	<0.1dB
Degree of Polarization ³	<0.25%	<1%
Insertion loss	<0.5dB	<0.5dB
Return loss	>70dB	>70dB
Source linewidth ⁴	>5nm	>5nm
Operating temperature range⁷	-50ºC to 70ºC	-50ºC to 70ºC
Transportation/storage ⁸	-40ºC to 85ºC	-40ºC to 85ºC
Input Fiber type	SMF28(SM) PANDA (PM)	SMF28(SM) PANDA (PM)
Output Fiber type	SMF28(SM) PANDA (PM)	SMF28(SM) PANDA (PM)
Pigtails	1m fiber standard, 900um loose tube optional	1m fiber standard, 900um loose tube optional

All dimensions are approximate and may vary slightly.

Notes to Specifications

_• All specifications are worst case for the
_• wavelength range.
_• All depolarizers are individually tested.

1. The devices will provide depolarization over a wide wavelength range for which the fiber is single mode.

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 the specified value.

4. Linewidths of 1nm - 5nm can be accommodated, please contact our sales representative.

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

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

PACKAGING

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