TTL – First Page DataSheet

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• TTL Logic Levels on I/O
• Unmodulated IRIG-B Transport
• 1PPS Transport (1PPM also
• Clock Rates up to 20 MHz
• Optimization for Duty Cycle
Distortion (DCD)
• -20°C to +70°C Operating
Temperature Range
• 1310 nm, 1550 nm, CWDM
• Automatic Optical Power Control
• Local and remote monitoring
• Uncooled Isolated DFB Lasers
• Available in 19” Rack Enclosures
• Lasers Conform to Class 1 Emission
Level Per CDRH and IEC-825 (EN
60825) Standards


• Data Rates > 5 Mbps
• High Optical Loss Budgets, > 15 dB
• Multimode Fiber


• On-Board TTL Transport Over Long
• PTP Signal Distribution
• NTP Server Signal Distribution
• Synchronization of Power System
• GPS Timing Distribution


The Optical Zonu TTL Series of OEM fiber optic transmitter and receiver modules facilitate the transport of DC coupled timing (and other) signals that are not modulated onto RF carriers, over long distances of fiber. The most basic application is the fiber optic conversion and transport of (on board) TTL signals.  The TTL Series also facilitates the transport of precise timing signals such as IRIG-B (unmodulated), 1PPS, and contact closure.  The RF interface on the TTL modules is 50Ω SMA (standard) or 50Ω SMB. Optical connector options include SC/APC (standard) and FC/APC fiber pigtails. TTL fiber transmitters are available in all CWDM wavelengths (1270 – 1610 nm). TTL signals may be multiplexed together, or with RF signals, for transport over a single fiber. A built-in RFI shield supports low EM/RF interference and susceptibility.  Transport over single mode fiber is standard, however the Optical Zonu TTL fiber links support transport over multimode fiber as well. Contact Optical Zonu.  Duty cycle distortion (DCD) is primarily driven by the optical loss budget between fiber transmitter and receiver and clock speed (or pulse width). Optical Zonu's design provides robust performance over a range of optical loss budgets and pulse widths.  The TTL transmitter features an optically isolated DFB laser diode operating at 1310 nm (standard), 1550 nm (standard), or CWDM wavelengths. The TTL fiber optic receiver features a high performance InGaAs photodiode. Alarm and monitoring functions are available through a 10 pin connector. Contact Optical Zonu for all of the available options.