31 January 2005 Low-cost cooler-less signal sources for C-WDM applications
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We report the performance of coarse-WDM (C-WDM) uncooled DFB lasers for upper 8 C-WDM wavelengths (1470~1610nm). Due to well-designed structures and well-controlled detuning, low threshold current, high slope efficiency, and high side-mode suppression ratio were maintained even at 85°C. For 2.5Gbps digital applications, these uncooled DFB lasers have clear eye opening, and can transmit through 100km standard single mode fiber with small dispersion penalty (<1dB). For repeater application of mobile communication system, low Relative Intensity Noise (RIN) level of -165dB/Hz at 2.2GHz and -168dB/Hz at 800MHz were achieved respectively at an optimized bias current of over 55mA, and third order distortion (IMD3) was less than -60dBc even at 85°C. For CATV return-path applications, second order distortion (IMD2) of less than -50dBc and IMD3 of less than -65dBc were achieved at 85°C. We performed accelerated aging test and estimated median lifetime was 105hours at 85°C with output power of 5mW.
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Junji Yoshida, Keishi Takaki, Ryosuke Yatsu, Naoki Tsukiji, Akihiko Kasukawa, "Low-cost cooler-less signal sources for C-WDM applications", Proc. SPIE 5624, Semiconductor and Organic Optoelectronic Materials and Devices, (31 January 2005); doi: 10.1117/12.581040; https://doi.org/10.1117/12.581040

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