A pump-LD (Laser Diode) is an excitation light source for a fiber amplifier used in optical communication networks.

Types of pump-LDs include an FP-LD (Fabry-Perot Laser Diode) and FBG-LD, which connects fiber with FBG (Fiber Bragg Grating) formed on the FP-LD and provides high wavelength stability and narrow linewidth by selecting the wavelength. Spectral examples of each are indicated below.

FBG module schematic

Example FP-LD spectrum

Example FBG-LD spectrum

FP-LDs are mainly used for EDFAs (Erbium Doped Fiber Amplifiers), and output light matching the excitation wavelength of the EDFA, particularly the 1.48 um band wavelength with good excitation efficiency.

FBG-LDs are mainly used for FRAs (Fiber Raman Amplifiers), and enable the center wavelength to be determined according to the required wavelength specifications of the FRA.

Anritsu provides both 1.48 um LD modules suitable for EDFAs and 1.4 um FBG-LD modules suitable for FRAs.

1.48 um LD modules provide a maximum optical output of 650 mW and a center wavelength of 1,475±15 nm, according to the required specifications of the EDFA.

1.4 um FBG-LD modules use a PM (Polarization Maintaining) fiber with FBG (Fiber Bragg Grating) to select the wavelength, and the center wavelength can be determined according to the required specifications of the FRA. An optical output can be provided with 300 to 500 mW.

We can also provide 1.3 um band FBG-LD modules which can be used for higher order FRA.

Anritsu LD modules comply with Telcordia GR-468-CORE for extremely high reliability, as well as the RoHS directive. The module has an industry-standard 14-pin butterfly shape and includes a TEC (Thermo-Electric Cooler) for temperature control and PD for optical output monitor.

Features

1.48 um LD module

• Optical output: 120 to 650 mW (in 10 mW increments)
• Wavelength range: 1,475±15 nm
• Fiber: Single Mode Fiber (SMF) or Polarization Maintaining Fiber (PMF)
• Optical connector: Supports various optical connectors
• 14-pin butterfly package
• Includes optical isolator, monitor photo diode, and cooler

1.4 um FBG LD module

• Optical output and wavelength range: 410 to 500 mW/1,420 to 1,485 nm, 500 to 650 mW/1,420 to 1,470 nm
• Fiber: Polarization maintaining fiber (0.25 mm, UV coated)
• Optical connector: Supports various optical connectors
• 14-pin butterfly package
• Internal monitor PD and TEC