| 1. |
- Che, D., et al.
(author)
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200-Gb/s Direct Modulation of a 50-GHz Class Laser with Advanced Digital Modulations
- 2021
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In: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers Inc.. - 0733-8724 .- 1558-2213. ; 39:3, s. 845-852
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Journal article (peer-reviewed)abstract
- Directly modulated lasers (DML) dominate the short reach optical interconnect market. For years, the bandwidth of commercial DMLs has been limited to a level of 25 GHz, which can support a speed up to around 100 Gb/s via advanced modulations like Nyquist-shaped 4-ary pulse amplitude modulation (PAM-4), carrier-less amplitude phase (CAP) modulation, subcarrier multiplexing, and discrete multitone (DMT). To scale with the capacity evolution of interconnect applications, it is in urgent demand to develop DMLs operated at 50G class and even beyond. In this article, we exploit a newly designed 50G-class short-cavity distributed Bragg reflector (DBR) laser, called the two-κ DBR laser, and demonstrate its capability of supporting 200 Gb/s per wavelength direct modulation and direct detection transmissions. Combining high-speed electronics with the 50G-class DML, we demonstrate a variety of advanced digital modulations including Nyquist-shaped 100-GBaud PAM-4, 80-GBaud PAM-8, and 50-GHz DMT signals, with the maximum net bit rate of 236 Gb/s. The DML exhibits an ultra-low chirp parameter of 1.0, which enables isolator-free operation and dispersion-tolerant transmission over tens of kilometers at O-band.
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| 2. |
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| 3. |
- Che, D., et al.
(author)
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Long-term reliable >200-Gb/s directly modulated lasers with 800GbE-compliant DSP
- 2021
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In: Optics InfoBase Conference Papers. - : Optica Publishing Group.
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Conference paper (peer-reviewed)abstract
- We demonstrate the long-term reliable operation of a 70-GHz-class DFB+R laser and its capability of 108-GBd PAM-4 signaling under +4.8-ps/nm dispersion using ultra-low complexity equalizations as well as faster-than-Nyquist PAM-2 signaling up to 280 GBd.
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| 4. |
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| 5. |
- Matsui, Y., et al.
(author)
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Isolator-Free > 67-GHz Bandwidth DFB+R Laser with Suppressed Chirp
- 2020
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In: 2020 Optical Fiber Communications Conference and Exhibition, OFC 2020 - Proceedings. - : Institute of Electrical and Electronics Engineers Inc..
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Conference paper (peer-reviewed)abstract
- We report on simultaneous realization of > 67 GHz bandwidth, a reflection tolerance up to 12.5 %, and a record-low chirp parameter of 0.6 for a DFB laser integrated with a passive waveguide with 3% reflection coating, called DFB+R laser.
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