Corning MetroCore Optical Bare Fiber 2669 (T M ) / 2km

The Corning MetroCore Optical Bare Fiber 2669 is a 2 km spool of non-zero dispersion-shifted single-mode fiber engineered for short-haul metropolitan networks operating at 2.5 Gbps and 10 Gbps. Its moderate negative dispersion of approximately -8 ps/(nm

km) at 1550 nm compensates for positive frequency chirp in directly modulated lasers, enabling extended transmission reach without discrete dispersion compensation modules. Low attenuation across the C-band and L-band, combined with minimal polarization mode dispersion, supports dense WDM deployments and cost-effective DM-DFB laser implementations.

Technical Specifications

• Fiber Type: Non-zero dispersion-shifted fiber (NZDSF)


• Nominal Length: 2 km spool


• Attenuation: ≤0.50 dB/km at 1310 nm; ≤0.25 dB/km at 1550 nm; ≤0.25 dB/km at 1605 nm


• Attenuation (Water Peak): ≤0.40 dB/km at 1383 ± 3 nm


• Total Dispersion: -10.0 to -1.0 ps/(nm
  
  km) over 1530 to 1605 nm


• Dispersion at 1550 nm: Approximately -8 ps/(nm
  
  km)


• Mode-Field Diameter (1550 nm): 7.60 µm to 8.60 µm


• Cable Cutoff Wavelength: ≤1260 nm


• Point Discontinuity: ≤0.10 dB at 1310 nm or 1550 nm


• PMD Link Value: ≤0.1 ps/√km


• PMD (Maximum Individual Fiber): ≤0.2 ps/√km


• Operating Temperature (Cabled Fiber): -40 °C to +70 °C


• Proof Test: Entire fiber length subjected to proof testing

Key Features

• Negative dispersion enables directly modulated laser operation without external compensation


• Low PMD supports high-speed DWDM systems with minimal pulse broadening


• Proof-tested fiber ensures reliability in critical network applications

Typical Applications

• Metro network validation and system characterization


• Signal latency and transmission performance testing


• Fiber splicing and laboratory operations


• Dense wavelength division multiplexing (DWDM) deployments

Compatibility & Integration

• Supports 2.5 Gbps and 10 Gbps transmission rates


• Optimized for directly modulated DM-DFB laser sources


• Effective across C-band (1530–1565 nm) and L-band (1565–1605 nm) wavelengths


• Recipient of the 2000 Photonics Circle of Excellence Award