The Keysight N1078A Optical/Electrical Clock Recovery module performs precision clock recovery from both optical and electrical signals across data rates from 125 MBd to 64 GBd. The module enables low-jitter synchronization essential for eye diagram analysis, jitter measurements, and signal characterization in optical communications and R&D environments. It recovers clock signals from NRZ and PAM4 modulation formats using a standards-compliant Golden PLL architecture with adjustable loop bandwidth up to 20 MHz and variable peaking.
Technical Specifications
Data Rate Coverage
• Option 264: 125 MBd to 64 GBd continuous (characteristic to 65.6 GBd)
• Option 232: 125 MBd to 32 GBd continuous (characteristic to 32.8 GBd)
• Option 216: 125 MBd to 16 GBd continuous (characteristic to 16.4 GBd)
• Option 253: 53 GBd to 58 GBd
• Option 225: 25 GBd to 29 GBd
Optical Interface
• Wavelength range: 1260 nm to 1620 nm (tested at 1310 nm and 1550 nm)
• Single-mode optical input with optional integrated 50-50 splitter (Option S50)
• Maximum optical input power: 8 mW (Option S50) or 4 mW (Option SXT)
• Optical data output available with Option S50
Electrical Interface
• Single-ended and differential data inputs
• Electrical input levels (characteristic): ±500 mV max. or ±2.2 Vpp max.
• Recovered clock electrical output
Sensitivity (NRZ & PAM4, single-ended, open eye)
• Option 264: 30 mV pp (≤53.125 GBd); 60 mV pp (>53.125 GBd)
• Option 253: 60 mV pp
– Key Features
• Golden PLL with standards-compliant clock recovery
• Degraded signal lock capability via optional variable equalizer (Option EVA)
• Jitter Spectrum Analysis for root-cause identification (Option JSA)
• PLL bandwidth and peaking measurements using N1010300A FlexPLL software and N1081PLCA application
• Supports NRZ and PAM4 signal types
– Typical Applications
• High-speed serial data eye diagram analysis
• Jitter and timing characterization
• Optical transceiver validation
• Communication system R&D
– Compatibility & Integration
Works with Keysight N1077A/B/8A models supporting up to 64 GBd operation. Integrates with N1010300A FlexPLL Application software for advanced PLL measurements.
