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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 12,
  • Issue 10,
  • pp. 100607-
  • (2014)

Tunable frequency upconversion based on a directly modulated DFB-LD and FP-LD injection

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Abstract

We show a simple, convenient, and cost-effective scheme for tunable frequency upconversion at millimeter-wave band without a local oscillator. By launching a 2.5-Gb/s directly modulated baseband signal into a Fabry-Pérot laser diode (FP-LD), the mode of the FP-LD is locked by the high-order sideband of the injected signal. The beating frequency of the injection-locked mode and the injected signal can generate upconversion subcarriers. In our experiment, tunable frequency subcarriers of 28.4, 29.3, and 30.5 GHz are obtained without any radio-frequency local oscillator. The single sideband phase noises of ?83.88, ?76.36, and ?78.54 dBc/Hz @ 10 kHz (at 28.4-, 29.3-, and 30.5-GHz subcarriers, respectively) are shown. The proposed scheme has potential to generate much higher frequency carriers.

© 2014 Chinese Optics Letters

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