Comb Stabilization Modules

Requirements / Specification Document 1 TITLE: Comb Stabilization Modules Requesting Laboratory / Division / Group: Communications Technology Laboratory Radio Frequency Technology Division High-Speed Waveform Metrology Group (672.03) General Statement of Need: The requested carrier-envelope offset (f₀ / fCEO) stabilization modules (quantity 2) shall support coherent operation of 1550 nm femtosecond frequency comb systems for electro- optic sampling, timing synchronization, and dual-comb waveform metrology applications. The module shall accept PM1550 femtosecond laser input through FC/APC fiber coupling with support for pulse energies between approximately 200 pJ and 1 nJ and pulse durations near 180–250 fs. The system shall provide high signal-to-noise fCEO detection (>35 dB SNR in 300 kHz RBW), integrated RF output through SMA connectivity, and internal photodetection suitable for comb offset stabilization and synchronization architectures. The module shall support stable operation for coherent frequency-comb measurements, low- noise timing distribution, and ultrafast waveform reconstruction in controlled laboratory environments, while maintaining compact form factors, low optical loss, and compatibility with dual-comb electro-optic sampling systems. Item Specifications and Quantities: Item 1: Comb Offset Stabilization Module (COSMO) Quantity: 2 EACH Specifications: 1.1 For carrier-envelope offset (f₀ / fCEO) detection and stabilization. 1.2 PM1550 fiber-coupled input with FC/APC connector and slow-axis alignment for compatibility with polarization- maintaining 1550 nm femtosecond comb systems. 1.3 Minimum required input pulse energy: 200 pJ at 1550 nm (typical operation around 150 pJ). 1.4 Maximum supported input pulse energy: 1 nJ at 1550 nm. 1.5 Maximum supported average optical power: 400 mW. 1.6 Optimized for femtosecond pulse durations between approximately 180–250 fs at the module housing input. 1.7 Integrated SMA RF output connector for extraction of carrier-envelope offset beat signal and synchronization electronics interfacing. 1.8 Internal photodetector bandwidth specified at 100 MHz for comb offset detection and stabilization measurements. 1.9 Carrier-envelope offset signal-to-noise ratio (fCEO SNR) greater than 35 dB measured in 300 kHz resolution bandwidth. 1.10 Compact enclosure dimensions of approximately 57 × 35 × 17 mm supporting integration into low-noise ultrafast optical frequency-comb and dual-comb electro-optic sampling architectures. 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