Paper
1 January 1987 Surface Acoustic Wave (SAW) Technology For Clock Recovery In The Fiber Distributed Data Interface (FDDI)
Michael R. Slawson
Author Affiliations +
Proceedings Volume 0841, Fiber Optic Networks and Coherent Technology in Fiber Optic Systems II; (1987) https://doi.org/10.1117/12.967566
Event: Cambridge Symposium on Fiber Optics and Integrated Optoelectronics, 1987, Cambridge, MA, United States
Abstract
This paper describes the use of Surface Acoustic Wave (SAW) technology for clock recovery, and the performance of this technology in the Fiber Distributed Data Interface (FDDI) draft standard. FDDI, because it operates at 125 MBd over the fiber optic media, requires tight control of the jitter accumulated in each point-to-point fiber link. The clock recovery function must be able to recover the clock and correctly sample the bit stream, given a relatively narrow "eye opening" at its input. Furthermore, the clock must be maintained during the FDDI "line states," which can have a very low transition density. This paper will first describe the particular implementation of SAW technology used for clock recovery, the SAW filter, and will define it purpose within the clock recovery function. Then, the jitter characteristics of the FDDI signal at the input to clock recovery, as well as the performance of the SAW-based clock recovery function under these input conditions, will be discussed. Experimental results obtained using a typical, Commercially available, SAW filter-based module will be presented. The various "detuning" sources of the SAW filter, which detract from the capability of the SAW-based module to perform accurate sampling, will be discussed. The performance of the module under FDDI line state conditions, particularly Master Line State (MLS) and Quit Line State (QLS), will be analyzed. The QLS, which indicated a disabled upstream transmitter or a cable break, contains no transitions and therefore no information for clock recovery. A circuit will be presented which uses the station's local oscillator and the "signal detect" function of the fiber optic receiver to derive the recovered clock in the event of QLS.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Michael R. Slawson "Surface Acoustic Wave (SAW) Technology For Clock Recovery In The Fiber Distributed Data Interface (FDDI)", Proc. SPIE 0841, Fiber Optic Networks and Coherent Technology in Fiber Optic Systems II, (1 January 1987); https://doi.org/10.1117/12.967566
Lens.org Logo
CITATIONS
Cited by 1 scholarly publication.
Advertisement
Advertisement
RIGHTS & PERMISSIONS
Get copyright permission  Get copyright permission on Copyright Marketplace
KEYWORDS
Clocks

Local area networks

Signal detection

Fiber optics

Receivers

Oscillators

Standards development

RELATED CONTENT

NAVSEA gigabit optical MAN prototype history and status
Proceedings of SPIE (February 01 1991)
IEEE 802.3 Fiber Optic Inter-Repeater Link
Proceedings of SPIE (January 01 1987)
Extending HIPPI at 800 mega bits per second over serial...
Proceedings of SPIE (February 01 1991)
Isolan A Fibre Optic Network Conforming To IEEE...
Proceedings of SPIE (October 06 1986)
Physical-connection compliance testing for FDDI
Proceedings of SPIE (February 01 1991)
Active Star Configured Fiber Optic CSMA/CD LANs
Proceedings of SPIE (January 01 1987)

Back to Top