DSP In-line Polarimeter
The POD-101D is a DSP (digital signal processor) powered in-line polarimeter specially designed for high-speed polarization analysis and monitoring. The instrument uses four channels to simultaneously obtain the four Stokes parameters and measure the instantaneous state of polarization (SOP) and degree of polarization (DOP) of an input light beam. A simple USB interface enables data to be transferred directly to a computer without the need for any additional hardware. Thanks to the high speed DSP electronics, this polarimeter easily monitors and analyses fast polarization changes with a sampling rate of up to 625 kS/s. The POD-101D comes with PolaView™ software for real-time graphic display of polarization state either on a Poincaré Sphere window for viewing SOP traces or on an oscilloscope window for tracking polarization changes over time. The oscilloscope window has three operation modes: continuous scan mode, for instantaneous display of various polarization parameters; external trigger mode, for capturing transient events; and long term monitoring mode, for recording only the polarization changes above a predetermined threshold, in order to save hard drive space. This instrument can be quickly and easily calibrated using its built-in self-calibration program to optimise DOP and SOP measurement and control at special wavelengths and temperatures. The POD-101D is ideal for PMD compensation, polarization stabilization, system polarization monitoring, polarization analysis, and sensor analysis
Polarization Measurement System
The PolaWise™ polarization measurement system accurately characterizes all polarization related properties of light sources and optical materials. Based on General Photonics' patented magneto-optic polarization generation and analysis technology, the PSGA-101-A is specially designed to effortlessly accomplish multiple functions in fibre optic applications, including polarization state generation (PSG) and measurement of state of polarization (SOP), polarization extinction ratio (PER), polarization dependent loss (PDL), and polarization mode dispersion (PMD). Another attractive feature of the instrument is its large flip-top LCD graphic display design, an industry first that allows large viewing area on a compact, portable enclosure. A 2x20 character front-panel LCD is also included for convenience in applications that do not require a graphic display, such as PER measurement. The PSGA-101-A's internal tunable laser enables PDL and PMD measurement up to 10 ps. The PSGA can also control tunable lasers from third parties via a GPIB port for measurement of larger PMD values. Finally, a VGA port allows the use of an external LCD graphic display of the user's choice. PolaWise™: a wise instrument and a smart choice!
Polarization Synthesizer/Analyser PSY-101
PolaFlex™ is a turn-key instrument that can generate and maintain any desired state of polarization (SOP), regardless of the input SOP. It combines General Photonics' patented polarization controller, in-line polarimeter, and control algorithm into an instrument that functions as both a deterministic polarization state generator and a polarization analyser. The generated SOP and the corresponding Poincaré Sphere can be readily displayed on a computer screen via USB interface. To generate a desired SOP, a user simply inputs the corresponding Stokes parameters using the front panel keypad. The instrument automatically searches for the SOP and maintains it against input SOP fluctuations. Another attractive feature is that the user can scan through 6 distinct SOPs (0°, 90°, ±45°, RHC and LHC) sequentially with user defined speed for Mueller matrix calculations, or select any of the 6 states with the touch of a button. Furthermore, the user can select multiple predetermined SOP traces for the instrument to generate, emulating certain common polarization variations. The instrument can also function as a polarization scrambler, generating random SOP scans with user-defined scanning speed. Finally, with the internal polarization controller disabled, PolaFlex™ can function as an in-line polarimeter, displaying the instantaneous SOP and DOP of the input light beam. This instrument can be quickly and easily calibrated using its built-in self-calibration program to optimise DOP and SOP measurement and control at special wavelengths and temperatures. PolaFlex™ puts all of the tools necessary for polarization management at your fingertips.
Polarization Dependent Loss Multimeter
Using a patented deterministic power search method (compliant with TIA/EIA-455-198), General Photonics' PDL multimeter measures the Polarization Dependent Loss (PDL), Insertion Loss (IL), and optical power, of a device under test (DUT) in sub-seconds. Unlike PDL meters that use a polarization-scrambled input to the DUT and look for the PDL via output power fluctuations, PolaCHEXTM systematically searches for the maximum & minimum transmission, assuring measurement accuracy at all times. Consequently, this instrument is the most accurate PDL meter available on the market, able to accurately characterize devices with both low and high PDL values. Even more impressively, PolaCHEXTM can cover a wide wavelength range from 1260 to 1650 nm without wavelength calibration - a clear advantage over meters based on the Mueller Matrix method. PolaCHEXTM comes with RS-232, USB, Ethernet, and GPIB interfaces for PC control, and is ideal for rapid, accurate characterization of the performance of passive devices, especially DWDM components, in manufacturing environments as well as in laboratories.
PMD and PDL Calibration Standards
PMD and PDL are important considerations in many applications, especially high data-rate communications. With the development of high precision test equipment and tighter-tolerance systems, a need has arisen for extremely precise calibration standards. General Photonics offers a range of calibration standards for DGD, second order PMD, and PDL. The accuracy of the standards is assured by the intrinsic optical and birefringence properties of the materials used in their construction.
Distributed Polarization Crosstalk Analyser PXA-1000
The Distributed Polarization Crosstalk (X-Talk) Analyser (PXA-1000) is an enhanced version of a white light interferometer designed to obtain space-resolved stress information by analysing stress-induced polarization cross-coupling along a length of polarization maintaining (PM) fibre. Its patent-pending optical design eliminates the strong zero-order interference and reduces the multi-coupling interference common in traditional white light interferometers, both of which can cause "ghost" peaks in the measured signal. The removal of the "ghost" peaks enables the PXA-1000 to unambiguously identify the magnitudes and locations of actual x-talk peaks, resulting in higher measurement sensitivity, higher dynamic range, and higher spatial measurement accuracy than traditional white light interferometers. The PXA-1000 also enables the use of the PM fibre itself as the sensing medium, eliminating the need to place multiple fibre gratings along the fibre. It can therefore obtain higher spatial resolution of the stress distribution than grating-based systems. Because no discrete sensing elements are required, the system is easy to install and calibrate, making it ideal for monitoring space-resolved structural changes along bridges, tunnels, dams, oil pipes, or buildings. It can also be used as an intrusion detection system, because any mechanical disturbances to the PM fibre will cause polarization coupling. Another important application is PM fibre quality inspection. The PXA-1000 easily identifies defective sections of PM fibre, enabling the manufacturers or users to remove them. Furthermore, the PXA-1000 is ideal for quality inspection and screening of PM fibre coils, since it can pinpoint the locations of imperfections or areas of local stress on the fibre coil induced during the fibre winding process. The PXA-1000 comes with a notebook computer equipped with PolaXView™ software, which displays the location and polarization coupling ratio of each stress point as a function of distance, and flags stress points with polarization coupling above a user defined trigger threshold. A quality inspection report window indicates the pass/fail status of the PM fibre or PM fibre coil, with a list of the locations and polarization coupling strengths of all stress points. Other applications of the instrument include measuring the extremely high polarization extinction ratio of a polarizing waveguide, obtaining the autocorrelation function of a light source, measuring the birefringence of a PM fibre and the lengths of PM and SM fibres, and matching the optical path lengths of an interferometer.
Dual or Single Channel Polarization Extinction Ratio Meter
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 fibre gyro IOC, PM coupler (PMC), or polarization beam splitter (PBS), as well as evaluate the performance (output DOP) of depolarisers. A lower-cost single-channel version, which can later be upgraded to dual-channel, is also an option. An analogue electrical PER output for each channel is available to enable feedback control of automated PM fibre alignment machines. 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 fibre pig tailing of modulators, waveguides, and laser diodes, as well as for PMC and PBS manufacturing, PM fibre connectorisation, depolariser characterization, PM fibre fusion splicing, PM fibre coil production and quality assurance for fibre gyros.
Degree of Polarization Meter
Using a patented maximum & minimum search technique, the DOP-201 measures and displays the Degree of Polarization (DOP) of a light source in real time with high accuracy and wide dynamic range. While polarimeter-based systems are expensive and can be inaccurate for low-DOP sources, and polarization scrambler-based instruments are less accurate for high DOP sources, the DOP-201 accurately measures both low and high DOP. It is ideal for characterizing the performances of depolarisers and depolarised light sources, such as ASE and SLED sources and the pumps for Raman amplifiers. It can also be used to monitor the OSNR and PMD of optical signals, and to measure the noise figure of optical amplifiers. The instrument can cover a wide operating wavelength range, including the S, C and L bands, without calibration. Its simultaneous measurement of DOP and optical power level of the light source under test can be used to obtain DOP power dependence and to ensure low insertion loss during depolariser manufacturing. The DOP-201 replaces our popular DOP-101, with higher measurement speed, higher measurement accuracy and resolution, wider operating power range, a better and brighter display, and the addition of an analogue output port for easy integration in automated depolariser manufacturing stations.
High Speed Polarimeter
The POD-201 is an FPGA powered polarimeter specially designed for high-speed polarization analysis and monitoring. The instrument uses four channels to simultaneously obtain the four Stokes parameters and measure the instantaneous state of polarization (SOP) and degree of polarization (DOP) of an input light beam. A USB 2.0 interface enables data to be transferred directly to a computer at a rate up to 30 MB/s. Thanks to the high speed FPGA electronics, this polarimeter easily monitors and analyses fast polarization changes with a sampling rate of up to 2MS/s. The POD-201 comes with PolaView™ software for real-time graphic display of polarization state either on a Poincaré Sphere window for viewing SOP traces or on an oscilloscope window for monitoring polarization changes over time. It can be quickly and easily calibrated using its built-in self-calibration program to optimise DOP and SOP accuracies at special wavelengths and temperatures. When paired with the FTC-101 fibre temperature cycling unit, it can be used to measure polarization extinction ratio (PER) to aid in aligning PM fibre to laser sources. The POD-201 replaces the POD-101D, with higher sampling speed and larger optical input power range. New features include an OLED display for easy setup and data display and a configurable analogue SOP/DOP/power output for easy integration with automated test systems. The POD-201 is available in three configurations: a two-port inline version, to monitor a signal without interruption; a one-port fibre-coupled option with high measurement sensitivity; and a one-port remote head option that can accommodate free-space inputs
Polarization Synthesizer/Analyser PSY-201
The PSY-201 is a deterministic polarization controller that can generate and maintain any state of polarization (SOP), regardless of the input SOP. It combines General Photonics' patented polarization controller, in-line polarimeter, and control algorithm into an instrument that functions as both a polarization state generator and a polarization analyser. The generated SOP and the corresponding Poincaré Sphere representation can be displayed on a computer screen via USB interface. The output SOP can be specified by inputting Stokes parameters using the front panel keypad or by manually tuning the SOP to reach a specific point on the Poincaré sphere or to reach an optimum value of a polarization-dependent metric. Once a desired output SOP is found, the instrument can automatically maintain this SOP against input SOP fluctuations. Another attractive feature is that the user can scan through 6 distinct SOPs (0°, 90°, ± 45°, RHC and LHC) sequentially with user defined speed for Mueller matrix calculations, or select any of the 6 states at the touch of a button. Furthermore, the instrument can generate several preprogrammed SOP traces that emulate certain common polarization variations. The instrument can also function as a polarization scrambler, generating SOP scans with user-defined pattern and speed. Finally, with the internal polarization controller disabled, the PSY-201 can function as an in-line polarimeter, displaying the instantaneous SOP and DOP of the input light beam. The PSY-201 replaces the popular PSY-101, with improved accuracy, speed, and functionalities. It puts all of the tools necessary for polarization management at your fingertips.