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 Expert  726284

Expert in Semiconductor Distributed Feedback (DFB) Laser Technologies, especially Design

Available for your Consulting and Expert Witness Needs

California (CA)
Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness Market Research

Summary of Expertise:

Listed with other top experts in: 

He has expertise in design and modeling of semiconductor lasers, especially distributed feedback (DFB) lasers, with more than 20 years experience in industries. He made a number of product laser designs for optical transmitters in the real field. He developed theoretical models of semiconductor lasers, and implemented them to industries as laser design tools. He is one of the first who made the three dimensional analysis of multi-quantum-well DFB lasers.


He has expertise of photonic integration such as electro-absorption modulator integrated laser, DFB laser arrays, semiconductor optical amlifier integration, and multi-section tunable lasers. He is one of the demostraters of cascaded DFB lasers for tunable laser applications.

optoelectronics science

Show Secondary and Basic Areas of Expertise
Expert may consult nationally and internationally, and is also local to the following cities: Los Angeles, California;  San Diego, California;  Long Beach, California;  Santa Ana, California;  Anaheim, California;  Riverside, California;  Glendale, California;  Huntington Beach, California;  San Bernardino, California;  and Chula Vista, California.

Year   Degree   Subject   Institution  
1980   PhD   Electronics Engineering   Kyoto University, Japan  
1973   MS   Electronics Engineering   Kyoto University, Japan  
1970   BS   Electrical Engineering   Kyoto University, Japan  

Work History:
Years   Employer   Title   Responsibilities

2007 to 2009


Applied Optoelectronics Inc.


Chief Scientist


He was responsible for the design and development of new semiconductor laser products with modeling and simulation. He was also in charge of making a future technology direction.

1998 to 2002


Fujitsu Compound Semiconductor Inc.


Senior Director


He was reponsible for all the lightwave R&D projects for 10 Gb/s and 40 Gb/s transmitter and receiver modules, as well as technical support for the customers.

1988 to 1998


Nortel Networks




He was responsible for the design of semiconductor laser products (chip), as well as university collaboation projects (as representative).

1973 to 1985






He was responsible for the design and development of 12 GHz microwave solid-state oscillators for satelite TV broad casting systems. He was also in charge of coordinating the Japanese Government Project for optical measurement system.

Career Accomplishments:

Fellow of IEEE Laser Electro Optics Society (LEOS)


He is an IEEE Fellow for the contribution to the theory and commercialization of gain-coupled distributed feedback lasers.

Publications and Patents Summary

He is an author of two book chapters, and he has more than 170 publications, more than 10 US patents and more than 40 patents applied in Japan.

Selected Publications and Publishers  
 - IEEE Journal of Quantum Electronics, Institute of Electrical and Electronics Engineers (IEEE)  
 - Journal of Lightwave Technology  

Consulting Services:
Selected Consulting Examples:
  • He provided the design and simulation of the active layers for 1.3 um, 1.49 um, and 1.55 um wavelength semiconductor distributed feedback (DFB) lasers. He gave a novel approach idea to improve the yield of single-mode operation, which was demonstrated experimentally. He also provided a theoretical DFB laser model and explained the physics.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

International Experience:
Years   Country / Region   Summary
1973 to 1985   Japan   He joined Panasonic, and worked at its research laboratory on the SHF to UHF down converter for satelite TV broad casting systems. He developed novel microwave solid-state oscillators and new compact dielectric resonators, which were used in the first field applications in Japan.

Language Skills:
Foreign Language   Description
Japanese   Japanese is his native language. English is his second-language. Since 1985, he has been in North America, and working using English.

Market Research:
Optoelectronics component for optical fiber communications. Optical communication systems (access to long-haul).

Click the green button above to contact Expert for a free initial screening call regarding your marketing research, industry research, and company research needs.  For research needs involving multiple experts or secondary research, a Research Director can be assigned to coordinate the work into a custom report for you as a potentially quicker and more cost effective alternative to doing this work yourself or hiring a boutique consultancy.  Remember, your initial screening call to speak with Expert is free.

Additional Skills and Services:

He has produced several seminars on semiconductor distributed feedback lasers, and technical presentation materials (model, design, measurement methods in semiconducto laser areas).

Supplier and Vendor Location and Selection

Strong connections to Japanese optoelectronics industries, such as Mitsubishi, Sumitomo, NEC, Hitachi, Furukawa etc.

Other Skills and Services

Laser performance simulation by MatLab and Fortran programming. Translation between English and Japanese (language). Patent writing and application.


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