Direct Modulation at 56 and 50 Gb/s of 1.3- $\mu $ m InGaAlAs Ridge-Shaped-BH DFB Lasers

Direct modulation at 56 and 50 Gb/s of 1.3-μm InGaAlAs ridge-shaped-buried heterostructure (RS-BH) asymmetric corrugation-pitch-modulation (ACPM) distributed feedback lasers is experimentally demonstrated. The fabricated lasers have a low threshold current (5.6 mA at 85°C), high temperature characteristics (71 K), high slope relaxation frequency (3.2 GHz/mA1/2 at 85°C), and wide bandwidth (22.1 GHz at 85°C). These superior properties enable the lasers to run at 56 Gb/s and 55°C and 50 Gb/s at up to 80°C for backto-back operation with clear eye openings. This is achieved by the combination of a low-leakage RS-BH and an ACPM grating. Moreover, successful transmission of 56and 50-Gb/s modulated signals over a 10-km standard single-mode fiber is achieved. These results confirm the suitability of this type of laser for use as a cost-effective light source in 400 GbE and OTU5 applications.

[1]  H. Fujita,et al.  1.3 μm, 56-Gbit/s EML module target to 400GbE , 2012, OFC/NFOEC.

[2]  M. Okai.  Spectral characteristics of distributed feedback semiconductor lasers and their improvements by corrugation‐pitch‐modulated structure , 1994 .

[3]  Kouji Nakahara,et al.  56-Gb/s direct modulation in InGaAlAs BH-DFB lasers at 55°C , 2014, OFC 2014.

[4]  K. Adachi,et al.  25-Gb/s Multichannel 1.3- $\mu$m Surface-Emitting Lens-Integrated DFB Laser Arrays , 2011, Journal of Lightwave Technology.

[5]  Naoki Fujiwara,et al.  1.3 μm, 50 Gbit/s electroabsorption modulators integrated with DFB laser for beyond 100G parallel LAN applications , 2011 .

[6]  Shigehisa Tanaka,et al.  1.3 μm InGaAlAs asymmetric corrugationpitch- modulated DFB lasers with high mask margin at 28 Gbit/s , 2014 .

[7]  Koichiro Adachi,et al.  Wide Temperature Range Operation of 25-Gb/s 1.3-μm InGaAlAs Directly Modulated Lasers , 2011, IEEE Journal of Selected Topics in Quantum Electronics.

[8]  T. Simoyama,et al.  50-Gbps direct modulation using 1.3-µm AlGaInAs MQW distribute-reflector lasers , 2012, 2012 38th European Conference and Exhibition on Optical Communications.

[9]  Kouji Nakahara,et al.  28-Gb/s directly modulated InGaAlAs ACPM DFB lasers with high mask margin of 22% at 55°C , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[10]  T. Kurosaki,et al.  50-Gb/s Direct Modulation of a 1.3-μm InGaAlAs-Based DFB Laser With a Ridge Waveguide Structure , 2013, IEEE Journal of Selected Topics in Quantum Electronics.