Optimum Linewidth of Spectrum-Sliced Incoherent Light Source Using a Gain-Saturated Semiconductor Optical Amplifier

Qikai Hu, Changyuan Yu, Pooi Yuen Kam, Hoon Kim

Research output: Journal article publicationJournal articleAcademic researchpeer-review

2 Citations (Scopus)


We investigate the optimum linewidth of the spectrum-sliced incoherent light (SSIL) source using a gain-saturated semiconductor optical amplifier (SOA) for the maximum capacity and longest transmission distance. For this purpose, we carry out experimental and simulation studies on the transmission performance of a 10-Gb/s on-off keying signal generated by using the SSIL source over a wide range of the SSIL linewidth. We find out that there are two windows of the linewidth for the high-speed operation of the SSIL source: ultra-narrow (i.e., linewidth \ll receiver bandwidth) and very wide (i.e., linewidth \gg receiver bandwidth). However, when the linewidth of the SSIL source is very wide, the 10-Gb/s signal generated by using this SSIL suffers severely from fiber chromatic dispersion and optical filtering. The simulation results are confirmed by experimental data measured by using an ultranarrow fiber Fabry-Perot filter (bandwidth = 700 MHz) and a bandwidth-tunable optical filter (bandwidth = 20 ∼ 53 GHz). Thus, we can conclude that the optimum linewidth of SSIL for capacity and transmission distance is ultranarrow. We also present a couple of drawbacks of the ultranarrow SSIL source, compared to the conventional wide-linewidth SSIL one, such as a large spectrum-slicing loss, a large SOA input power required for the suppression of excess intensity noise inherent in the incoherent light source, and the susceptibility to in-band crosstalk.
Original languageEnglish
Article number7164249
Pages (from-to)3744-3750
Number of pages7
JournalJournal of Lightwave Technology
Issue number17
Publication statusPublished - 1 Sep 2015
Externally publishedYes


  • Incoherent light
  • Semiconductor optical amplifier (SOA)
  • Spectrum slicing

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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