POLARIZATION EXTINCTION RATIO METER

POLARIZATION EXTINCTION RATIO METER
219 Westbrook Rd, Ottawa, ON, Canada, K0A 1L0 Toll Free: 1-800-361-5415 Tel:(613) 831-0981 Fax:(613) 836-5089 E-mail: [email protected]
POLARIZATION EXTINCTION RATIO METER
Features:
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Measures up to 40dB extinction ratios (over specific wavelength
ranges)
Built in RS232 Communications Interface
Wide wavelength range: 400 to 1000 nm for visible range; 850 to
1650 nm for IR
0.01dB resolution in ER and 0.3° resolution in angle
Accuracy in ER is 1dB, in angle is 0.5°
Measures up to 2 Watts CW input power
Rugged and compact design
Logging mode for continuous measurement
Interchangeable connector adaptors
CE Compliant
LOW COST!
Applications:
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Fiber optic component manufacturing
Automated alignment
Quality control and measurement
Product development
Component or system troubleshooting
Fiber Optic Polarization
Extinction Ratio Meter
Product Description:
OZ Optics’ Polarization Extinction Ratio Meter allows one to quickly
measure the output extinction ratio of light from a fiber. A rotating
polarizer measures the extinction ratio and the orientation of the
transmission axis with respect to the key on the connector. As an
option, neutral density filters can be added to the Extinction Ratio
Meter, to extend the maximum power range. These filters can be easily
inserted and removed, without disturbing your setup. These filters allow
power levels up to 2 Watts to be measured.
The meter operates in several modes. In real time mode, the meter
gives the extinction ratio and alignment. In logging mode, the meter
gives the worst case extinction ratio over a given time span. This mode
is ideal for QA measurements.
In addition the meter can provide a relative power readout, proportional
to the input power in dB. This readout is updated at up to 650 times per
second. The computer interface allows the unit to be used with
computer control units, for alignment purposes. The combination of
polarization and relative power functions allows the unit to be used for
complete auto-alignment of polarization maintaining components.
DTS0067
OZ Optics reserves the right to change any specifications without prior notice.
10-Feb-06
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Ordering Information For Standard Parts:
Bar Code
Part Number
Description
Meters
11998
ER-100-1290/1650-ER=40
11997
ER-100-IR
12866
ER-100-VIS
Fiber Optic Polarization Extinction Ratio Meter for wavelengths from 1290 nm to 1650 nm. ER =
40dB. Receptacle is not included.
Fiber Optic Polarization Extinction Ratio Meter for wavelengths from 850 nm to 1650 nm. ER =
30dB for wavelengths from 850 nm to 1290 nm and ER=35dB for wavelengths longer than 1290 nm.
Receptacle is not included.
Fiber Optic Polarization Extinction Ratio Meter for wavelengths from 400 nm to 1000 nm; ER >
30dB over the wavelength range. Receptacle is not included.
Receptacles
Super and Ultra FC removable receptacle for ER Meter for wavelengths from 1290 nm to 1650 nm
achieving up to 40 dB extinction ratio
Angled FC removable receptacle for ER Meter for wavelengths from 1290 nm to 1650 nm
achieving up to 40 dB extinction ratio
Super and Ultra FC removable receptacle for ER Meter for wavelengths from 850 nm to 1650 nm
achieving up to 30 dB extinction ratio
Angled FC removable receptacle for ER Meter for wavelengths from 850 nm to 1650 nm
achieving up to 30 dB extinction ratio
SC removable receptacle for ER Meter for wavelengths from 850 nm to 1650 nm achieving up
to 30 dB extinction ratio
LC removable receptacle for ER Meter for wavelengths from 850 nm to 1650 nm achieving up
to 30 dB extinction ratio
ST removable receptacle for ER Meter for wavelengths from 850 nm to 1650 nm achieving up
to 30 dB extinction ratio
Super and Ultra FC removable receptacle for ER Meter optimized for wavelengths from 400 nm
to 700 nm
13440
ER-23-1290/1650-ER=40
13441
ER-23A-1290/1650-ER=40
8705
ER-23-IR
7525
ER-23A-IR
7528
ER-2SC-IR
8874
ER-2LC-IR
7526
ER-28-IR
19254
ER-23-400/700
27611
ER-23A-400/700
Angled FC removable receptacle for ER Meter optimized for wavelengths from 400 nm to
700 nm
13165
ER-23-600/1000
Super and Ultra FC/PC removable receptacle for ER meter optimized for 600-1000 nm
14320
ER-23A-600/1000
FC/APC removable receptacle for ER meter optimized for 600-1000 nm
Attenuators
10626
ER-ND-10-450/1700
10 dB attenuator for ER Meter for wavelengths from 450 nm to 1700 nm
8704
ER-ND-20-IR
20 dB attenuator for ER Meter for wavelengths from 850 nm to 1650 nm
9471
ER-ND-35-1250/1650
35 dB attenuator for ER Meter for wavelengths from 1250 nm to 1650 nm
Sources
11378
PFOSS-02-3-1550-1-ER=40
13507
PFOSS-02-3-1310-1-ER=40
13509
PFOSS-02-3A-1310-1-ER=40
13508
PFOSS-02-3A-1550-1-ER=40
1550 nm, 1 mW Polarized Fiber Optic Source with a Super/Ultra FC/PC receptacle and rotatable
polarizer achieving up to 40 dB extinction ratio (Refer to Data Sheet titled Polarized Fiber Optic
Source for further information.)
1310 nm, 1 mW Polarized Fiber Optic Source with a Super/Ultra FC/PC receptacle and rotatable
polarizer achieving up to 40 dB extinction ratio
1310 nm, 1 mW Polarized Fiber Optic Source with angled FC/PC receptacle and rotatable
polarizer achieving up to 40 dB extinction ratio
1550 nm, 1 mW Polarized Fiber Optic Source with angled FC/PC receptacle and rotatable
polarizer achieving up to 40 dB extinction ratio
Reference Patchcords
13390
PMJ-3U3U-1550-8/125-1-1-1-ER=30-G
13386
PMJ-3A3A-1550-8/125-1-1-1-ER=30-G
Master patchcord, Ultra FC/PC to Ultra FC/PC, 8/125 um PM 1550 nm fiber, 0.9 mm OD
jacketed, 1 meter long with connectors aligned and locked to the slow axis. ER=30dB minimum
Master patchcord, angled FC/PC to angled FC/PC, 8/125 um PM 1550 nm fiber, 0.9 mm OD
jacketed, 1 meter long with connectors aligned and locked to the slow axis ER=30dB minimum
Accessories
4572
GPIB-RS232
RS232 to GPIB Converter
4571
GPIB-CABLE-2
2 meter long GPIB cable
13397
CASE-03
Ruggedized, waterproof carrying case
2737
POWER CORD - EUROPE
European power cord
2736
POWER CORD - UK
UK power cord
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Standard Product Specifications1:
Part Number
ER-100-IR
ER-100-1290/1650-ER=40
11997
11998
12866
850 nm to 1650 nm
1290 nm to 1650 nm
400 nm to 700 nm
600 nm to 1000 nm2
30dB for 850 nm to 1290 nm
35dB for 1290 nm to 1650 nm
40dB for 1290 nm to 1650 nm
30dB
Bar Code Number
Wavelength Range
Extinction Ratio Range
Dynamic Range
47dB
Extinction Ratio Accuracy
40dB
±1dB
Extinction Ratio Resolution
0.01dB
Angular Accuracy3
± 0.5 degrees
Angular Resolution
0.3 degrees
Update Rate (Extinction Ratio)
Update Rate (Relative Power)
2.7 Hz
650 Hz
Input Optical Power4
50 µW to 1.0 mW
Communication Interface
RS232
Input Supply Voltage5
Universal 50/60 Hz 110/220V AC/DC adapter
Dimensions (with protective boot)
65 x 90 x 184 mm (2.5 x 3.5 x 7.25 inches)
Weight (with protective boot)
0.48 kg (1.06 lb)
Operating Temperature
-10° to 50°C (14 to 122°F)
Storage Temperature
-30° to +60°C (-22 to 140°F)
Storage Humidity
<90% RH non condensing
Regulatory Compliance
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ER-100-VIS
Complies with EMC (EN61326:1997 & A1:1998) and Safety Requirements (EN61010-1:1993, A2:1995)
Tested at 23°C ± 2°C with a 1550 nm linearly polarized source plus a master 1550 nm polarization maintaining patchcord, after a 30 minute
warm-up period.
Depending on whether a receptacle for 400 to 700 nm or for 600 to 1000 nm wavelengths is selected.
For FC style connectors with high tolerance keyway.
Without attenuator. Higher powers can be measured with an attenuator. When ordering an attenuator with >20dB attenuation, the wavelength
should be specified. Note: Exposing the detector to power higher than +17dBm (50 mW) without attenuator for a short period of time (3 minutes)
can damage the detector.
North American power cord provided as standard equipment. Power cords for Europe and the United Kingdom can be ordered separately.
Ordering Examples For Standard Parts:
A customer in Europe needs an Extinction Ratio Meter to measure the polarization properties of pigtailed laser diodes, to confirm that
the polarization extinction ratio exceeds 30 dB. The lasers are 1550 nm lasers, with output power between 5 and 10 mW. The fibers are
terminated with either Super FC/PC, or with FC/APC connectors. The customer also wants a source and reference patchcord for
comparison. The following equipment will be needed:
Bar Code
Part Number
Description
11998
ER-100-1290/1650-ER=40
Fiber Optic Polarization Extinction Ratio Meter for wavelengths from 1290 nm to 1650 nm. ER = 40dB,
without receptacle
13440
ER-23-1290/1650-ER=40
Super and Ultra FC removable receptacle for ER Meter for wavelengths from 1290 nm to 1650 nm
achieving up to 40 dB Extinction Ratio
13441
ER-23A-1290/1650-ER=40
Angled FC removable receptacle for ER Meter for wavelengths from 1290 nm to 1650 nm
achieving up to 40 dB Extinction Ratio
10626
ER-ND-10-450/1700
10 dB attenuator for ER Meter for wavelengths from 450 nm to 1700 nm
11378
PFOSS-02-3-1550-1-ER=40
1550 nm, 1 mW Polarized Fiber Optic Source with a Super/Ultra FC/PC receptacle and Rotatable
polarizer achieving up to 40 dB Extinction Ratio (Refer to data sheet titled Polarized Fiber Optic
Source for further information.)
13390
PMJ-3U3U-1550-8/125-1-1-1-ER=30-G
Master patchcord, Ultra FC/PC to Ultra FC/PC, 8/125 um PM 1550 nm fiber, 0.9 mm OD jacketed,
1 meter long with connectors aligned and locked to the slow axis. ER=30dB minimum
13386
PMJ-3A3A-1550-8/125-1-1-1-ER=30-G
Master patchcord, angled FC/PC to angled FC/PC, 8/125 um PM 1550 nm fiber, 0.9 mm OD
jacketed, 1 meter long with connectors aligned and locked to the slow axis. ER=30dB minimum
2737
POWER CORD - EUROPE
European power cord (order one for the meter, one for the source)
Ordering Information For Custom Parts:
OZ Optics welcomes the opportunity to provide custom designed products to meet your application needs. As with most manufacturers,
customized products do take additional effort so please expect some differences in the pricing compared to our standard parts list.
In particular, we will need additional time to prepare a comprehensive quotation, and lead times will be longer than normal. In most cases
non-recurring engineering (NRE) charges, lot charges, and a 1 piece minimum order will be necessary. These points will be carefully
explained in your quotation, so your decision will be as well-informed as possible. We strongly recommend buying our standard products.
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Questionnaire For Custom Parts:
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What is your application?
Will you be using the device at a specific wavelength?
What is the maximum extinction ratio that you will need to measure?
Do you require external control from a computer?
What type of computer interface do you require?
What is the maximum power level that you will be using?
What type of connector will you be using?
Description
P = Attenuation Level: 10dB, 20dB, 30dB or 35dB
Note: For attenuations over 20dB, specify the
wavelength in nm
Extinction Ratio Meter:
W = Wavelength Range (in nm) IR for 850-1650 nm
VIS for 400-1000 nm
Note: If an ER of 40dB is required then specify either
980/1060 or 1290/1650 for the wavelength, and add
“-ER=40” to the part number. ER>40 dB is only
achieved on IR models over 980 to 1060 nm, and
1290 to 1650 nm wavelength ranges.
Attenuators:
X = Connector Code: 3 = Standard Flat, Super or
Ultra NTT-FC/PC receptacle
3A = Angled NTT-FC/PC
8 = AT&T-ST
SC = SC
SCA = Angled SC
Connector Adaptors:
LC = LC
MU = MU
2.5U = Universal adaptor for
2.5 mm diameter ferrules
1.25U = Universal adaptor for
1.25 mm diameter ferrules
Consult factory for special connector and ferrule
adaptors.
Part Number
ER-100-W
ER-ND-P-W
W = Wavelength Range in nm:
ER-2X-W
IR for 850-1650 nm
600/1000 for 600-1000 nm
400/700 for 400-700 nm
PMJ-XY-W-a/b-1-1-1-ER=30-G
Reference Patchcords:
X,Y = Connector Code: 3A = Angled NTT-FC/PC
3S = Super NTT-FC/PC connector
3U = Ultra NTT-FC/PC connector
8 = AT&T-ST
SC = SC
SCA = Angled SC
LC = LC
MU = MU
Consult factory for special connector and ferrule adaptors.
W = Wavelength (in nm):
Example: (1550 for 1550 nm, 1300 for 1300 nm, 980 for 980 nm)
a/b = Fiber core and cladding sizes, in microns:
(6/125 for 980 nm PM fiber, 7/125 for 1300 nm PM fiber, 8/125 for
1550 nm PM fiber)
Ordering Example for Custom Parts:
A Canadian manufacturer of high power WDM for EDFA applications wants to do incoming extinction ratio qualification, at 980 nm, of
any purchased optical components prior to using them in his systems. They need to order these following parts:
Bar Code
Part Number
Description
HIPFOSS-02-3A-980-10-BL-ER=40
980 nm, 10 mW Highly Stable Polarized Fiber Optic Source with an angled FC receptacle,
rotatable polarizer, achieving over 40dB extinction ratio. BL= blocking style attenuator
13485
ER-100-980/1060-ER=40
980 nm, Fiber Optic Polarization Extinction Ratio Meter. ER = 40dB. Receptacle is not included.
13488
ER-23A-980/1060-ER=40
980 nm, Angled FC Removable Receptacle for ER Meter. ER = 40dB
8704
ER-ND-20-IR
20 dB attenuator for ER Meter for wavelengths from 850 nm to 1650 nm
PMJ-3A3A-980-6/125-1-1-1-ER=30-G
Master patchcord, angled FC/PC to angled FC/PC, 6/125 um PM 980 nm fiber, 0.9 mm OD
jacketed, 1 meter long with connectors aligned and locked to the slow axis, ER=30dB minimum
n/a
n/a
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Application Notes:
Comparison of the OZ ER meter with results from a polarimeter
A common alternate technique used in polarization analysis is through the use of a polarimeter. These devices work by mathematically
mapping the output polarization from a source onto what is known as a Poincaré sphere. By monitoring the variation of the polarization
over time on this Poincaré sphere, one can calculate the variation in the polarization and presumably the degree of polarization itself.
There are two principle drawbacks with this technique. The first is that to map the polarization onto the Poincaré sphere, polarimeters
subtract any randomly polarized light from the signal. Thus any calculation of the polarization extinction ratio using a polarimeter ignores
this signal. This results in reported values that are more optimistic than that given by the OZ Extinction Ratio Meter. The Extinction Ratio
Meter gives a more conservative and more reliable result.
The second drawback is that most fiber optic polarimeters utilize singlemode fiber to transmit light to its internal sensors. The singlemode
fiber itself changes the polarization to an arbitrary polarization. Therefore fiber optic polarimeters are only suitable for measuring relative
changes. This makes them unsuitable for alignment of polarization maintaining connectors.
General Considerations
OZ Optics Polarization Extinction Ratio Meters, together with OZ Optics Highly Stable Polarized Sources, provide a quick, reliable, and
effective means to align, characterize, and QA polarization maintaining components. To ensure that your measurements are as accurate
as possible, the following precautions should be taken.
1. Check your reference angle:
The OZ Optics Extinction Ratio Meter provides a reading of the polarization axis orientation compared to the keyway on the receptacle.
However, if the receptacle is exchanged or replaced, the orientation might be changed by a few degrees.
To ensure that the angle reading is accurate, OZ Optics supplies master reference patchcords. These patchcords maintain polarization
to better than 30dB, and are aligned to within ±1.5 degrees of the connector keyway. A menu option allows one to adjust the angle
reference to any desired value, allowing one to compensate for any offset. Note that a misalignment of θ degrees between the source
and the fiber will degrade the extinction ratio and the maximum ER that can be achieved will be given by:
ER ≤10 log (tan 2 θ)
2. Stress the fiber:
When working with a highly coherent source, such as a DFB laser, it is possible to get readings that initially meet specifications, but
degrade over time. This degradation of the extinction level can take several minutes to occur. This behavior occurs because part of the
light within the fiber is traveling along the wrong axis. At the output end of the fiber the light traveling along the slow and fast axes
combine to form a unique polarization state. If the two signals are in phase with one another, they will form linearly polarized light.
However, as the fiber is stressed, the phase relation will change and so will the output polarization.
To check for this behavior, one should stress the fiber while measuring the polarization. The meter has a data logging mode for this
function. To use it, activate the logging mode through the menu, then apply stress to the device under test. One common method is to
simply wrap the fiber several turns around a mandrel, 40 or 50 mm in diameter. Such a mandrel is available from OZ Optics. A second
technique is to heat the fiber with a warming plate. After stressing the fiber, stop the logging mode. The meter will then display the worst
case extinction ratio, and the variation in the polarization angle. Use these readings as the performance specification. Refer to the
manual for further details.
3. Look both ways:
If a device is being used to transmit light in either direction, then it should be inspected in both directions. The performance of a device
will depend on the direction in which it is used. This is because stresses and microbends usually occur near the fiber ends. If the
microbend is at the output end of the fiber, then the output polarization may be rotated, but otherwise remain static. However if the
microbend is at the input end, then the polarization is perturbed before travelling through the fiber, so the polarization will vary.
4. Autoalign components using the computer interface.
The meter can report both power and extinction ratios to a computer control system via an RS232 interface. This can be used to develop
an auto-alignment system. The power level can be reported at over 650 samples per second, which is sufficient for rapid alignment.
A complete set of application notes, one on polarization measurements (POLARIZATION MAINTAINING MEASUREMENT SYSTEMS),
the other on how to use the meter for alignment applications (AUTOMATED POLARIZATION ALIGNMENT) are available from our
website (www.ozoptics.com).
5. Measurement limits
The detection circuitry for the ER meter has an overall dynamic range of about 60 dB. When the input signal has a power level within
the range of 50 µW to 1 mW (a 13 dB range), this leaves at least a 47 dB range for the ER measurement itself. Since the extinction ratio
is based on the ratio of two values, a minimum and a maximum, the minimum value may approach the noise floor of the instrument if
the extinction ratio is really good or the input power is close to 50 µW or below. In such a case, the minimum value may default to the
noise floor of the instrument. Under these conditions, the instrument may not be able to provide an accurate reading. However, it will be
able to determine a worst case value, which will be indicated to the user as such. By using a higher-powered source, the instrument will
be able to provide an improved reading. For example, with a low power signal, the ER meter may indicate that an extinction ratio is
>27 dB. If the user needs to know whether the actual value is over 30 dB, then a more powerful source should be used. If the ER meter
has an optional attenuator installed, the user could simply remove the attenuator.
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Extinction Ratio Meter
With Polarized Source (PFOSS)
PM V-Groove Array ER Measurements
OZ Optics ER Meter for PM V-Groove array's provides for fast and accurate extinction ratio measurements of V-Groove assemblies
manufactured with PM fiber. The semi-automated system is computer controlled for hassle free control and measurements. The system
consists of a polarized stable light source, 3 axis measurement micro-stage with one axis motorized, an extinction ratio display set and
PC software to control the system. The stage and meter display are connected to a PC using RS-232 cables. The system is capable of
measuring extinction ratios up to 40dB with an angle accuracy of 1.5°. The ordering information is as follows:
Bar Code
Part Number
Description
13620
PER-KIT-3VGA-1550-1-ER=40
Polarization Extinction Ratio Measurement System for testing V-Groove Arrays using 1550 nm
polarization maintaining patchcords terminated with FC connectors with Super PC or Ultra PC
Finishes. Kit Contains the following:
Source:
PFOSS-02-3-1550-1-ER=40
Meter:
ER-11-1290/1650-ER=40 (Includes PC interface and software)
Mount:
ER-VGA-1290/1650-ER=40 (Includes positioning Stage)
Patchcord: VGA-1-250-0-X-10.3-3.8-2.03-P-1550-8/125-3S-0.25-1-0-ER=30-G
4572
GPIB-RS232
RS232 to GPIB Converter (optional)
4571
GPIB-CABLE-2
2 meter long GPIB cable (optional)
2737
POWER CORD - EUROPE
Power Cord for European AC receptacles (optional)
2736
POWER CORD - UK
Power Cord for United Kingdom AC receptacles (optional)
Operating the PM V-Groove Array ER Measurement system
The system works by first setting the software configurations for the appropriate V-Groove size and spacing. The V-Groove chip is then
attached to the mounting stage and the opposite end of the fiber is attached to the polarized source. After adjusting the stage to roughly
align the fiber to the meter, the software is started to take the ER measurement and automatically move the array to the next fiber
position. Manual recording of the measured ER and angle is required at this point, optional software is available to log the measurements
for later use. At the software prompt, the user must change the fiber on the polarized stable source so the next measurement can be taken.
PM V-Groove Array Extinction Ratio Measurement System
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