Abstract
We propose and comprehensively investigate a subcarrier-multiplexing (SCM) system based on 62.5-μm-core-diameter multimode fiber (MMF) using a single wavelength to achieve 10-Gb/s transmission over link lengths beyond 300 m, using 1.3-μm-wavelength lasers with radial offset launch into MMF links. The system utilizes multichannel SCM transmission using quadrature-phase-shift-keyed modulation in combining baseband transmission with three passband SCM channels at the carrier frequencies of 3.75, 6.25, and 8.75 GHz while incorporating a maximum laser modulation bandwidth of 10 GHz to ensure system compliance with the limits of current uncooled laser devices. A statistical investigation of the system highlights its capability to achieve an acceptable yield over worst-case MMF links of length 600 m. We also investigate the improvement in system performance granted by allowing a controlled overlap of frequency spectra of the passband SCM channels. In addition, we test the accuracy of the previously proposed usable average slope criterion of less than 4 dB/GHz, which is needed to achieve low-penalty transmission with eye-closure penalties > 3 dB.
| Original language | English |
|---|---|
| Pages (from-to) | 2976-2983 |
| Number of pages | 8 |
| Journal | Journal of Lightwave Technology |
| Volume | 25 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 1 Oct 2007 |
Funding
Manuscript received January 24, 2007; revised June 19, 2007. This work was supported by the Engineering and Physical Sciences Research Council (U.K.). The authors are with the Department of Engineering, Electrical Engineering Division, University of Cambridge, CB3 0FA Cambridge, U.K. (e-mail: [email protected]; [email protected]; [email protected]; [email protected]). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/JLT.2007.904419 Fig. 1. (a) Frequency response of an example FDDI-grade MMF link of length 300 m, where solid arrows indicate passband regions potentially suitable for SCM transmission beyond the −3-dBo bandwidth. The −3-dBo frequency is indicated by the dotted line. (b) Schematic diagram of a generic single-channel SCM link.
Keywords
- Multimode fiber (MMF)
- Quadrature phase-shift keyed (QPSK)
- Subcarrier multiplexing (SCM)
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics