OTN clock translator suits 100G coherent optical networks

24th November 2014
Siobhan O'Gorman

Fully compliant with the ITU-T G.8251 standard, which ensures interoperability and satisfactory network performance, the ZL30169 OTN (Optical Transport Network) clock translator has been introduced by Microsemi. The ultra-small, three-input, three-output any-rate-to-any-port clock translator for OTN provides output clocks with jitter performance of 250fs RMS, suitable for 100G coherent optical networks.

According to market research firm Infonetics, 100Gb/s is the next speed of choice, with greater than $10bn in revenue expected by 2018, mostly from service providers. In CY13, the number of 100G ports shipped quintupled to 70,000. The 100G coherent technology enables transport of 100G data rate across long distances, up to 2500km.

The ZL30169 integrates a Digital PLL (DPLL), Analogue PLL (APLL) and EEPROM into an ultra-small 5x5mm 32-pin QFN package. The APLL generates the ultra-low jitter output clocks programmable to any frequency from 1Hz to 1035MHz. With programmable loop bandwidth from 14 to 500Hz, the DPLL accepts any input frequency from 1kHz to 1250MHz and provides hitless reference switching, holdover and jitter filtering. The EEPROM provides automatic self-configuration of the device at start-up. The ZL30169 is provided with critical features such as dynamic rate conversion for forward error correction used in OTN transport and switching applications. The OTN clock translator meets all the jitter and wander requirements that are specified in the ITU-T G.8251 Recommendation to ensure satisfactory network performance.

The ZL30169 also offers numerically controlled oscillator mode in which output frequencies can be controlled with a resolution greater than 0.01ppb by system software. This capability provides a cost-effective solution for customers designing their own Mapper with FPGAs to replace large, expensive VCXOs.

The easy-to-use evaluation software generates configuration scripts to be stored in internal EEPROM or to be run on a system processor.

“100G coherent technology is being rapidly adopted by carriers because of its spectral efficiency and reach. This triggers the need to support more flexible client rates with stringent jitter requirements," said Maamoun Seido, Vice President and Business Unit Manager of timing products, Microsemi. "Our highly flexible ZL30169 line card device meets these requirements."

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