The detailed design process and experimental results of stacked multilayer diffractive optical elements are reported for an optical network unit used in optical subscriber-network applications. The optical network unit accepts two incoming light beams of 1.3- and 1.55-μm wavelengths through a single-mode optical fiber. A laser diode is also placed for bidirectional communications. The optical network unit consists of five diffractive optical elements that perform the following functions: collimation of incoming beams, focusing of the outgoing 1.55-μm beam, 3-dB splitting of the 1.3-μm beam, focusing of the 1.3-μm beam onto the photodiode, and collimation of the light emitted from a laser diode. Possible cost reductions as a result of mass production and the ease of alignment of the stacked diffractive optical elements could be ideal for constructing low-cost optical network units.
© 1998 Optical Society of America
(050.1970) Diffraction and gratings : Diffractive optics
(060.2330) Fiber optics and optical communications : Fiber optics communications
(130.0250) Integrated optics : Optoelectronics
(220.4830) Optical design and fabrication : Systems design
(250.5300) Optoelectronics : Photonic integrated circuits
Hironori Sasaki, Ikuo Fukuzaki, Yoichiro Katsuki, and Takeshi Kamijoh, "Design Considerations of Stacked Multilayers of Diffractive Optical Elements for Optical Network Units in Optical Subscriber-Network Applications," Appl. Opt. 37, 3735-3745 (1998)