General Photonics Unveils a Complete Suite of Instrumentation Solutions for Polarization Testing in Coherent Detection Systems

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The New PDLProTM PDLE-101 and the Version 2 PMDPro™ PMD-1000 Headline a Suite Featuring Five Other Solutions

General Photonics, a market leader in polarization control and polarization measurement, today announced a complete suite of instrumentation solutions for polarization related testing in coherent detection systems. The new PDLPro™ PDLE-101 has been added while the company's popular PMDPro™ PMD-1000 is upgraded to version two.

In addition to the new PDLE-101 and upgraded PMD-1000, the product suite also features the PolaMight™ MPC-101; the PolaDetect™ POD-101D; the PolaFlex™ PSY-101; the PolaMIX™ PCD-104; and the PolaWise™ PSGA-101-A. Together, the solutions form a powerful collection of instrumentation necessary for polarization related testing in 40/100 Gbps coherent detection systems.

PDLE-101 and PMD-1000
The PDLPro (PDLE-101) PDL Source/Emulator aids in testing to ensure that high speed fiber optic transceivers and coherent detection systems meet their stringent PDL tolerance specifications. The PDLE-101 is specifically designed for performance measurement of the PDL tolerance, tracking speed and recovery time of the PDL mitigation algorithm of a coherent detection system. Other applications include PDL emulation; code development for PDL compensation in coherent detection systems; and system PDL response testing. The PDLE-101 can generate individual PDL values between 0 dB and 20 dB, with a resolution of 0.1 dB for PDL tolerance testing. It can also generate variable PDL with a user-defined range, waveform, and speed for PDL tracking speed and recovery time tests.

The PMDPro (PMD-1000) is an advanced PMD source that can deterministically generate precise 1st order PMD up to 180 ps and 2nd order PMD up to 8100 ps2. The large range and coverage area facilitate both PMD tolerance testing and response mapping of particular zones in PMD space. Important new features for version two include PMD trace scans to test tracking speed; an expanded polarization optimization capability for worst-case PMD effect; and PMD statistical emulation including 1st and 2nd order PMD. Upgrades to the quasi-continuous PMD control mode allow the user to directly access almost any point in PMD space by specifying the DGD and SOPMD, either from the front panel or the control program. The user-defined sequence scan has similarly been upgraded to allow programming of any sequence of PMD values. The entire user interface has been revised for ease of use. The version 2 PMDPro is now an unparalleled tool for PMD emulation and measurement, combining large range, various PMD pattern generation capabilities, PMD compensation, including long-term monitoring, and automatic and manual polarization control.

"With this product suite, we have set a new benchmark in advanced instrumentation for polarization related testing in coherent detection systems," said Steve Yao, Founder and CEO of General Photonics. "With our products being used worldwide by tier one customers across the entire ecosystem for coherent detection system solutions, we are excited about the advanced capabilities of our solutions and will continue to strive to develop industry-leading products."

Summary of Other Products in the Suite
In addition to the PDLPro and upgraded PMDPro, several other products combine to round out the suite for polarization testing instrumentation for coherent detection systems. The PolaMight MPC-101 is a multi-function polarization controller for emulating polarization variations in a real system, while the POD-101D is a high speed in-line polarimeter for monitoring polarization variations. The PolaFlex PSY-101 combines the functions of the MPC-101 and POD-101D. These solutions can generate and monitor any polarization on the Poincareé sphere, can generate and monitor variable speed continuous variation for tracking speed tests, and can generate and measure fast polarization transitions for recovery time tests. The PolaWise PSGA-101-A is the most accurate measurement instrument in the world for PDL and PMD measurement. The POD-101D, PSY-101, and PSGA-101-A all have polarization angle measurement functions, so they can be used for polarization orthogonality tests. Finally, the PolaMIX PCD-104 is a polarization scrambler that uses advanced all-fiber technology to effectively randomize polarization states.

Availability and Live Demo at OFC / NFOEC 2011
All products are now available and will be further detailed during a product introduction session March 9, 2011 at 2 pm PST at OFC / NFOEC, being held at the Los Angeles Convention Center. Visitors to the event may also stop by General Photonics' booth #1638 for a product demonstration March 8-10, 2011, during show hours. Purchasing details and additional specifications can be made available by contacting General Photonics via email at sales(at)generalphotonics(dot)com. In addition, further details are available at General Photonics' online product section.

Testing Needs
Coherent detection with polarization division multiplexing (PDM) has emerged as the key technology enabler for 40 Gbps and 100 Gbps networks because it significantly increases the spectral efficiency of each channel and allows each channel to transmit at a high bit rate with relatively small optical bandwidth. Consequently, 40 Gbps, 100 Gbps, or even 160 Gbps channels can be transmitted over existing 10 Gbps WDM infrastructures with 50 GHz channel spacing. PDM doubles the spectral efficiency by combining two polarization channels of the same bit rate at the same wavelength. Also, coherent detection allows multiple levels of phase and amplitude modulation at lower rates to be multiplexed on the same wavelength channel.

Coherent detection systems generally perform the following polarization control functions: polarization demultiplexing; PMD compensation (PMDC); and PDL compensation (PDLC). These functions can be accomplished using high speed DSP circuits and algorithms in the transceivers. For transceiver developers, the evaluation of different DSP circuits and algorithms is critical. For the system integrators using the transceivers, it is important to compare the performance of transceivers from different vendors, including the three key polarization control functions. Finally, network operators using the systems developed by different system vendors should evaluate and compare the polarization performances from different vendors and optimize deployment decisions. Therefore, advanced testing instrumentation becomes important for PMD and PDL related tests that cover tolerance range, tracking speed and recovery time.

About General Photonics
Founded in 1995, General Photonics is an award-winning world leader in the design and development of advanced optical polarization and timing management instruments, modules and components. Its products are used worldwide in applications such as fiber optic communications networks; test and measurement applications such as for coherent detection systems; fiber optic sensor systems; medical imaging equipment and other applications. General Photonics, a privately-held company, maintains its headquarters and a manufacturing facility in Chino, Calif. An Engineering Center of Excellence and technical support team is located in Beijing, China. The company also uses a worldwide network of sales distributors and representatives. More information can be found at

Note: references to corporate, product or other names may be trademarks or registered trademarks of their respective owners.

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Yuanyuan Fang
General Photonics
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Rafael Larin
Emissary Communications
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