• Technical Conference:  30 March – 03 April 2025
  • Exhibition: 01 – 03 April 2025
  • Moscone Center, San Francisco, California, USA

Beyond Two-Core Fibers: Single-Core vs Multi-Core Amplifiers in Long-Haul SDM Links

Tuesday, 26 March, 14:00 – 16:00

Room 6E

Space division multiplexing (SDM) is a promising approach for overcoming the capacity crunch of current fiber-optic transmission systems. In recent years, SDM transmission using uncoupled multi-core fibers (MCFs) with standard cladding diameter has attracted much attention, mainly for its potential application in long-haul submarine networks. Two-core links envisioned as a first generation of multi-core SDM will use bidirectional transmission and well-developed and tested single-core erbium-doped optical fiber amplifiers (EDFAs).

EDFAs for the next generation of MCF-SDM can be implemented in single-core and multi-core fibers (MCFs). The former typically requires a pair of fan-in/out devices and consists of conventional single-core EDFAs and related components. The latter utilizes multi-core components such as MC-EDFs, MC-WDM couplers, MC-GFFs, and MC-isolators. Which approach will be adopted depends on the transmission scheme of MCF systems and on the availability of suitable components. The choices that are made will determine the direction of the development of future optical fiber networks.

The panelists will discuss the pros and cons of both approaches utilizing single-core and multi-core amplifiers from different perspectives and will provide insight into future MCF networks.

Topics to cover:
• Unidirectional MCF transmission vs. bidirectional MCF transmission
• Single-core amplifier vs. multi-core amplifier
• Core-pumped amplifier vs. cladding-pumped amplifier


Victor Kopp, Chiral Photonics, United States

Atsushi Nakamura, NTT, Japan

Bera Pálsdóttir, OFS Fitel Denmark I/S, Denmark

Masato Tanaka, Sumitomo Electric Industries Ltd, Japan


Dan Neugroschl, Chiral Photonics, United States

Philippe Perrier, Meta, United States

Massimiliano Salsi, Google, United States

Ryuichi Sugizaki, Furukawa, Japan

Hitoshi Takeshita, NEC, Japan

Yuta Wakayama, KDDI, Japan