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ANRITSU
symbol rate (with consequent double spectral efficiency), and PAM8 an R/3 symbol rate (with triple spectral efficiency), compared to a NRZ signal. One of the reference signalling speeds nowadays is 32Gbps. PAM4 generation allows 2x32Gbps=64Gbps signals at the input of the PAM4 converter module to generate a 32Gbaud/s transmitted signal, as shown in figure 3. PAM8 generation allows 3x32Gbps=96Gbps signals at the input of the PAM8 converter module to generate a 32Gbaud/s transmitted signal, as shown in figure 4. In these setups, precision in synchronizing the original signals into the PAM converter is key to achieving perfect conversion, and a resulting multilevel signal with a good opening in each “eye portion”, to allow successful transmission. For this reason, it is essential that the original signals be of high quality, with quick rise/fall time and MERL is seeking a highly self- motivated, qualified researcher to join our team to perform cutting- edge research in the area of optical communications systems. The candidate is expected to have a strong background in the research, advanced technology development, simulation and experimental verification of next generation optical fiber networks, especially for metro, long-haul and submarine systems at the physical layer. Deep knowledge of coherent optical fiber transmission systems, optical fiber nonlinearity and digital signal processing (DSP) is essential. Experience of optical network system architecture and network layer design is strongly preferred. The successful candidate will be expected to lead and perform original research within the above areas, and to extendMERL’s domain of expertise. Further responsibilities and qualifications are defined below.
MP1800A SQA 2ch PPG
MZ1834A 4PAM Converter
32GBaud, 64Gbits signal
Differential 4PAM Signal
NRZ Data CH1
32Gbps
32Gbps
NRZ Data CH2
Figure 3
MP1800A SQA 4ch PPG
MZ1834A 8PAM Converter
32GBaud, 64Gbits signal
Differential 8PAM Signal
NRZ Data CH1
32Gbps 32Gbps 32Gbps
NRZ Data CH2
NRZ Data CH3
Figure 4
low jitter, and that the Signal Quality Analyzer be capable of managing channel synchronization upon generation, and inter-channel skew control. R&D engineers also need to tune the multiple eye openings in the resulting signal, thus relying on the analyzer to offer this capability. Depending on the application (from short distance high speed
interconnects to long distance telecoms) the media involved in these tests can be single-mode or multi-mode fibers, or even copper cables as an hypothetical lowest cost implementation for very short reach. All of these media require careful testing to overcome specific impairments and exploit technical advantages. All of the industry, from standards
committees to R&D engineers to test and measurement companies, are currently united in producing big efforts to achieve a higher speed, more efficient and “greener” telecommunications world as soon as possible. Alessandro Messina
EMEA Wireline Marketing & Business Development Director, Anritsu
Member Research Staff Mitsubishi Electric Research Laboratories (MERL), Cambridge, MA, USA
Responsibilities: Conceive new ideas and •
theoretical analysis, simulation and experimental verification of optical communications systems at the physical layer. Detailed knowledge of soft- • decision error correction coding techniques would be an asset. Experience of optical system • architecture at the datalink/ network layer and above would be an asset. Excellent programming skills (C/ • C++ and Matlab) are required. Ability to handle multiple • simultaneous assignments and balance workload among different projects.
Strong teamwork and • interpersonal skills are
conduct innovative research and technology development in optical communications systems. Publish research in leading • technical journals, conferences and patent applications. Create project proposals and • lead research projects. Collaborate with corporate R&D • laboratories and academic groups. Qualifications: A Ph.D. from an internationally • recognized institution in electrical engineering or a related field with several years of industry experience. Documented track record • of creative innovation and of developing, conducting, and leading successful research projects. Strong background in the •
essential. Good presentation and written communications skills are required. Interested parties should contact parsons@merl.com. No phone calls please. Mitsubishi Electric Research Laboratories, Inc. is an Equal Opportunity Employer. Mitsubishi Electric Research Laboratories 201 Broadway Suite 8, Cambridge, MA 02139, USA www.merl.com
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