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Journal Article
Shared LO-based self-coherent 16QAM transmission with PTBC for cost-sensitive metro networks
- Authors
- Jongwan Kim, Sang-Rok Moon, Sun Hyok Chang, Hun-Sik Kang, Sunghyun Bae
- Issue Date
- 2026-05
- Citation
- Optics Communications, v.604, pp.1-7
- ISSN
- 0030-4018
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- We propose a cost-effective architecture for 100-Gb/s metro networks with an 80-km reach, utilizing Alamouti polarization-time block code (PTBC), a self-coherent scheme, and a shared-local oscillator (LO) configuration. The combination of PTBC and the self-coherent scheme enables the use of a single-polarization coherent receiver without carrier recovery algorithms. While conventional self-coherent schemes typically require two fiber strands to transmit a single signal, the proposed shared-LO configuration allows a single LO to serve multiple signal channels, thereby improving fiber utilization efficiency. We experimentally demonstrate the transmission of 120- and 240-Gb/s PTBC 16-QAM signals over 80 km of single-mode fiber. A power budget analysis, based on our experimental results, shows that a single LO can support up to 15 and 7 signal channels for the 120- and 240-Gb/s systems, respectively, assuming a 16-dBm laser output power.
- Keyword
- Polarization-time block code, Self-coherent, Shared local oscillator
- KSP Keywords
- 16-ary quadrature amplitude modulation(16QAM), 16QAM transmission, Block codes, Budget analysis, Coherent receiver, Cost-sensitive, Fiber strands, Laser output, Metro network, Output power, QAM signals
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
