The ERM-202 is a dual channel polarization extinction ratio (PER) meter specifically designed to simultaneously measure the PER and power ratio of a
device with two polarization maintaining (PM) outputs, such as a Y-branch fiber gyro IOC, PM coupler (PMC), or polarization beam splitter (PBS), as well as evaluate the performance (output DOP) of depolarizers.A lower-cost single-channel version, which can later be upgraded to dual-channel, is also an option. An analog electrical PER output for each channel is provided. With a PER dynamic range of 50 dB and an angular resolution of 0.06°, this instrument outperforms all competitors in its class. Its bright graphic OLED display allows information to be comfortably seen at large viewing angles and at a distance. The instrument has 4
measurement speeds ranging from 0.1 to 1 second/cycle, with the high speed for live alignment and the low speed for accuracy. PER, axis angle, power ratios, and optical power are automatically measured and displayed on the OLED screen. The measurement data can also be stored and recalled at the touch of a button for comparison purposes. The ERM-202 is ideal for PM fiber pigtailing of modulators, waveguides, and laser diodes, as well as for PMC and PBS manufacturing, PM fiber connectorization, depolarizer characterization, PM fiber fusion splicing, PM fiber coil production and quality assurance for fiber gyros.
Figure 2: ERM-202 schematic diagram of measurement principle
Figure 1 : ERM-202 Polarization Extinction Ratio Meter
Key Features
• Two measurement channels
• Simultaneous PER & power ratio testing
• > 50 dB PER range
• Bright OLED display
• High angular resolution
• Store and recall functions
Applications
• IOC PER & coupling ratio tests
• PMC & PBS PER & coupling ratio tests
• Laser diode PM fiber pigtailing
• PM fiber patch cord production
• PM fiber fusion splicing QA
• PM fiber coil and fiber gyro QA monitoring / measurement