LUNA ERM-202 – Extinction Ratio Meter
- One or Two Measurement Channels
- Free Space Input
- Front Panel or Remote Control
- 50 dB PER range
- Bright OLED display
- Store and Recall Functions
The LUNA ERM-202 is a single or dual channel polarisation extinction ratio (PER) meter. When used with a broadband source, it directly measures PER. Single and dual channel models are available. The single channel instrument can be upgraded to a dual-channel version at a later date. By combining low noise circuitry with a high resolution stepper, the ERM series achieves a PER dynamic range of 50 dB.
These instruments are the first to market with OLED displays, a high contrast bright readout that allows the data to be observed from several feet away. The instruments can be operated from the front panel or via remote control. The operator can choose from 4 measurement speeds to optimise speed or accuracy and can observe multiple parameters on the front panel screen including PER, axis angle, power ratios, and optical power.
The measurement data can be stored and recalled for comparison purposes from the front panel as well. Full digital or remote control is included for unattended or system applications.
APPLICATIONS
- Verification of PM connectorisation and splices
- Testing PM fibre coils
- Simultaneous measurement of PER and power ratio
- Testing Y-branch fibre gyro IOCs
- Testing PM couplers (PMC), or polarisation beam splitters (PBS)
- Evaluating the performance of depolarisers
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Operating Wavelength Range1 |
1260 to 1620 nm |
960 to 1160 nm |
600-850 nm |
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Calibrated Wavelengths2 |
1550 and 1310 nm |
980 and 1064 nm |
630 and 830 nm |
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PER Dynamic Range |
> 50 dB |
> 40 dB |
> 40 dB |
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PER Ranges3 |
0 to 50 dB for input power -5 to 10 dBm 0 to 30 dB for input power -25 to -5 dBm |
0 to 40 dB for input power 0 to 10 dBm 0 to 30 dB for input power -20 to 0 dBm |
0 to 40 dB for input power 0 to 10 dBm 0 to 30 dB for input power -20 to 0 dBm |
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Input Optical Power Range |
-30 dBm to 10 dBm |
-20 dBm to 10 dBm |
-20 dBm to 10 dBm |
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PER Resolution |
0.1 dB |
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PER Accuracy |
±0.15 dB for ER < 30 dB |
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Angular Resolution |
0.06° |
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Angular Accuracy |
±1° |
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Power Measurement Accuracy |
±0.5 dB |
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Power Resolution |
0.02 dB (PER < 30 dB) 0.2 dB (PER > 30 dB) |
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Measurement Speeds |
0.1, 0.2, 0.4, 1 seconds (Single channel version also has 10s measurement speed and manual polarizer control mode) |
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Connector Type2 |
Free space adapter for FC connector |
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Optical Power Damage Threshold |
300 mW |
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Operating Temperature |
0 °C to 40 °C |
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Storage Temperature |
-20 °C to 60 °C |
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Display |
OLED graphic display |
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Communication Interfaces |
USB, RS-232, Ethernet, and GPIB |
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Analog Output4 |
0-5V (max range) monitor voltage scales with log of instantaneous power afterrotating polarizer. |
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Electrical Power Supply |
100 – 240 VAC, 50 – 60 Hz |
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Dimensions |
2U 19” half rack width 14” (L) x 8.5 “ (W) x 3.5” (H) |
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Notes: 1 Specifications given at 23±5 °C.2 Other wavelength ranges and connector types may be available. 3 Other calibrated wavelengths available. 4 For measurement at or slower than 0.4 s/cycle
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General Photonics ERM-202 datasheet 
