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Jitter measurement box performs ITU-T O.172 Standard tests

Posted: 16 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:anritsu? mp1797a? jitter analyzer?

Grappling with making accurate high-speed jitter compliance tests? Then check out test-and-measurement vendor Anritsu Company's new MP1797A jitter analyzer. It's a 40G instrument that can make measurements on 40G transmission devices and systems in accordance to ITU-T (International Telecommunications Union) Standard O.172.

Supporting the five most popular jitter measurements, the MP1797A measures intrinsic jitter of OC-768/STM-256 devices and transmission systems. The instrument can perform jitter generation, jitter tolerance, jitter sweep, jitter transfer, and frequency sweep tests.

Complementary components

It can make those five measurements using customized jitter software, a built-in jitter generator and jitter receiver, and high performance O/E (optical to electrical) and E/O (electrical to optical) modules.

Designed for evaluating the performance of OC-768 and STM-256 devices during development and manufacturing, the MP1797A can also be used during the evaluation and installation of OC-768 and STM-256 transmission systems.

The MP1797A's internal jitter-generator outputs a 39.81312GHz jittered clock with jitter modulation frequencies up to 320-MHz, and modulation amplitudes up to 16,000-UIp-p (unit intervals).

Additionally, the jitter generator has a frequency offset function that varies from -100ppm (parts per million) to 100ppm. Using both lowpass and highpass filters defined by ITU-T O.172, the jitter receiver accurately detects and analyzes the clock.

In addition to a 1/1 clock, the MP1797A has 1/16 and 1/64 clock outputs. These let it perform accurate transponder tests.

Measurement accuracy is also ensured, in part, by the product's MU179701A E/O unit, and an MU179702A 39.8-Gbit/s O/E module. Used with the jitter generator and a BERT (bit error rate tester) transmitter, the MU179701A converts 25Gbps to 43Gbps NRZ (non-return to zero) electrical data to optical NRZ data for transmission. It features an output power of 0dBm (3dBm), and has a clock delay function that's adjustable in 1ps steps.

In use, the MU179702A receives optical data, recovers the jitter clock, and transmits the signal to the jitter receiver. It has a 320MHz wideband CDR (clock/data recovery), as well as a narrowband CDR of less than 16MHz, to ensure jitter measurement accuracy.

The MU179702A also has wide sensitivity of 0dBm to -10dBm. An internal optical power meter is available with it, too.

Automatic measurement capability

With Anritsu's MX179701A jitter measurement application software, all measurements can also be performed automatically. In addition, the software can convert jitter transfer and jitter tolerance test results, and display them in chart form for reporting purposes.

Delivery is slated for 20 weeks after order. Unfortunately, at press time there was no pricing specified for this instrument, nor is there any additional information, such as a datasheet, on the company's Web site. When I get this information I will update this article, so watch this space for developments.

- Alex Mendelsohn


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