OFC technical sessions feature test and measurement
OFC/NFOEC 2007, March 25-29, Anaheim Convention Center, Anaheim, CA. www.ofcnfoec.org.
-- Test & Measurement World, 4/2/2007 11:39:00 AM
| Also see: -Bandwidth demand has brought life to OFC -Live from OFC/NFOEC |
The annual OFC/NFOEC conference continued on Wednesday with an afternoon technical session that addressed optical test and measurement. In the first paper, Wolfgang Moench of JDSU described a measurement technique that he says will change the way engineers measure OSNR in optical receivers. "Measuring the Optical Signal-to-Noise Ratio in Agile Optical Networks" then resulted in a lively discussion about measurement techniques. A member of the audience argued that "we’re still mixing polarization-mode dispersion and differential group delay."
In the next presentation, "Fault Location for Branched Optical Fiber Networks based on OFDR Technique Using FSF Laser as Light Source," Nianou Zou described a technique for finding faults in fiber-optic cable using the frequency domain, or OFDR, using a frequency shifted feedback laser. Norman Swensen of ClariPhy Communications followed with details of testing components of IEEE 802.3aq (10GBase-LRM) in "Standards Compliance Testing of Optical Transmitters Using a Software-Based Equalizing Reference Receiver."
Product Exhibits
On the show floor, Agilent Technologies (www.tm.agilent.com) introduced two instruments designed to streamline optical measurements. The N4917A optical receiver stress test set tests optical receivers at data rates up to 12.5 Gbps. That speed lets it rest receivers designed for 10-Gbit Ethernet and Fibre Channel. The instrument produces calibrated transmission streams with known eye openings. You can adjust eye openings by changing either amplitude or jitter. A single transmitter supports 1310-nm and 1550-nm wavelengths on single-mode fibers.
The N4376B lightwave component analyzer eases the setup involved in characterizing components at 850-nm wavelengths. That wavelength is used for components such as those used for interchip communications. It can produce and capture optical or electrical signals. Thus, it can test electrical-to-optical, optical-to-electrical, and optical-to-optical components. The instrument cuts test setup time, and it provides repeatable measurements.
Apex Technologies (www.apex-t.com) displayed the AP2440A series of optical spectrum analyzers. The AP2440A measures both optical power and phase, which you can use to measure chirps and pulses in the frequency domain.
With 40-Gbps optical links on the rise, Centellax (www.centellax.com) demonstrated its 40-Gbps bit-error-rate tester (BERT) system. It consists of individual instruments: a 40-Gbps PRBS pattern generator, a demultiplexer, a 40-GHz divider, a 50-GHz amplifier, a 40-Gbps amplifier, and at least one 10-Gbps BERT. The system uses the demultiplexer and divider to convert a 40-Gbps stream to 10-Gbps for the BERT to measure. The system is also available as a 10-Gbps BERT.
JDSU (www.jdsu.com) introduced the OTU-8000, a rack-mounted instrument for remote testing of fiber networks from FTTx to long haul. The unit holds two OTDR modules that let network operators find faults in deployed cables. The company also introduced the Optical Component Environmental Test System (OCETS) that can test FTTx components such as splitters. It can test up to twelve 32-post splitters.
Tektronix (www.tektronix.com) demonstrated its DSA8200 digital signal analyzer ("TDR scope analyzes 12.5-Gbps data paths") that characterizes paths for digital data streams up to 12.5 Gbps.
Yokogawa (www.us.yokogawa.com) introduced a firmware upgrade and remote-control software for the AQ7270 optical time-domain reflectometer. The company also introduced and demonstrated a 40-Gbps differential quadrature phase-shift-keying (DQPSK) optical transmission module.
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