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DFB Basics 3

B) Feedback by facet reflections (Fabry-Perot laser diode). If the facets are as cleaved, the facet reflections are 30 %, which makes a Fabry-Perot (FP) laser cavity, as is shown in Fig. 4(b). The spontaneous emission generated inside the cavity is amplified and reflected by the facets. C) Distributed feedback by grating (DFB laser diode). If the facets are AR coated, and a grating is formed on the waveguide layer, the feedback is provided by the grating, as is shown in Fig. 4(c).

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Ir●●ne , California, 92614

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Toshihiko Makino

22 B●●●●lona

Ir●●ne , California, 92614

United States

949●●●711

th●●●●●●@gmail.com

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Toshihiko Makino

22 B●●●●lona

Ir●●ne , California, 92614

United States

949●●●711

th●●●●●●@gmail.com

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DFB Basics 3 | chyeguide.com Reviews

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B) Feedback by facet reflections (Fabry-Perot laser diode). If the facets are as cleaved, the facet reflections are 30 %, which makes a Fabry-Perot (FP) laser cavity, as is shown in Fig. 4(b). The spontaneous emission generated inside the cavity is amplified and reflected by the facets. C) Distributed feedback by grating (DFB laser diode). If the facets are AR coated, and a grating is formed on the waveguide layer, the feedback is provided by the grating, as is shown in Fig. 4(c).

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DFB Basics 3 | chyeguide.com Reviews

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B) Feedback by facet reflections (Fabry-Perot laser diode). If the facets are as cleaved, the facet reflections are 30 %, which makes a Fabry-Perot (FP) laser cavity, as is shown in Fig. 4(b). The spontaneous emission generated inside the cavity is amplified and reflected by the facets. C) Distributed feedback by grating (DFB laser diode). If the facets are AR coated, and a grating is formed on the waveguide layer, the feedback is provided by the grating, as is shown in Fig. 4(c).

INTERNAL PAGES

chyeguide.com

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Home

http://www.chyeguide.com/home.html

Expert of Distributed Feedback (DFB) Laser Diodes. Experienced in design of DFB laser diodes in industries over 25 years. Ph D, IEEE Fellow. Chyeguide is a website name for Dr. Toshihiko Makino. Chye" has the pronunciation similar to the Japanese word expressing "wisdom". Chyeguide is intended to provide the guidance for understanding DFB laser technologies, especially design and modeling, as well as consulting services.

2

DFB Basics 4

http://www.chyeguide.com/dfb-basics-4.html

An example of the simulated ASE spectrum is shown in Fig. 5(a). There is no optical feedback mechanism to make lasing since both facets are AR coated. The spectrum shape is determined by optical gain spectrum and spontaneous emission spectrum. An example of the simulated ASE spectrum just below threshold of lasing is shown in Fig. 5(b). An example of the simulated ASE spectrum just below threshold of lasing is shown in Fig.5(c). Simulated Amplified Spontaneous Emission Spectra.

3

Publications

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Author and co-author of over 170 journal papers and conference presentations. Major publications (first author). 1] T Makino, J. D. Evans, and G. Mak, "Maximum output power and maximum operating temperature of quantum well lasers", Appl. Phys Lett., Nov. 17, 1997. 2] T Makino, "Amplified spontaneous emission model for MQW DFB lasers", IEEE J. Quantum Electron, vol. pp. 33, pp.1010-1017, June. Technol. Lett., vol. 8, pp. 602-604, May 1996. Technol., vol. 12, pp. 2072-2099, Dec. 1994. 9] T Makino, "Transfe...

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Pofile

http://www.chyeguide.com/profile-1.html

Profile of Dr. Toshihiko Makino. Dr Makino is internationally recognized for his contributions to DFB laser technologies, especially gain-coupled DFB lasers, and transfer-matrix DFB laser models. He has over 40 years experience of research and development in industries, in optoelectronics technologies for over 28 years (in North America). He also worked in microwave technologies for 10 years, especially in microwave solid-state oscillators. B Electrical Engineering: Kyoto University, Japan, 1970. DFB las...

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DFB Basics 2

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Applications of DFB Lasers. DFB lasers diodes are most widely used as single-mode light sources for optical fiber communication systems. Schematic diagram of a DFB laser. A schematic diagram of a DFB laser is shown in Fig. 3. It is composed of. An active layer consisting of multiple quantum well (MQW) layers, which is sandwiched between p-side and n-side waveguide layers to form a waveguide core region. The current is injected from the p-electrode through to the n-electrode.

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DFB Basics 3

B) Feedback by facet reflections (Fabry-Perot laser diode). If the facets are as cleaved, the facet reflections are 30 %, which makes a Fabry-Perot (FP) laser cavity, as is shown in Fig. 4(b). The spontaneous emission generated inside the cavity is amplified and reflected by the facets. C) Distributed feedback by grating (DFB laser diode). If the facets are AR coated, and a grating is formed on the waveguide layer, the feedback is provided by the grating, as is shown in Fig. 4(c).

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