Large-Tolerant Direct Coupling to an SMF Array With a Lens-Integrated Surface-Emitting Laser

As a solution to provide a small-size and low-cost 100-Gb/s optical module, direct optical coupling between a lens-integrated surface-emitting DFB laser (LISEL) array and a single-mode fiber (SMF) array is demonstrated. A very-small far-field angle (~2°) was obtained by monolithic integration of an...

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Bibliographic Details
Published in:IEEE photonics technology letters 2015-05, Vol.27 (9), p.939-942
Main Authors: Adachi, Koichiro, Takei, Aki, Suzuki, Takanori, Tanaka, Shigehisa, Nakanishi, Akira, Naoe, Kazuhiko
Format: Article
Language:English
Subjects:
Arrays
Couplings
Fiber lasers
integrated optics
Lenses
Loss measurement
Optical coupling
optical interconnects
Surface emitting lasers
Surface-emitting laser
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Summary:As a solution to provide a small-size and low-cost 100-Gb/s optical module, direct optical coupling between a lens-integrated surface-emitting DFB laser (LISEL) array and a single-mode fiber (SMF) array is demonstrated. A very-small far-field angle (~2°) was obtained by monolithic integration of an InP lens with a laser chip. As a result, each channel of the LISEL array can directly couple to an SMF without any additional external optical components. The measured misalignment tolerance between the LISEL array and an SMF array was sufficiently large, namely, ±5.5 μm, at excess loss of 1 dB over all four channels with the maximum coupling efficiency of 8.4 dB. These measurement results are in good agreement with a theoretical calculation based on Gaussian optics. These results demonstrate that high coupling efficiency (-3 dB) can be achieved while large misalignment tolerance (±4.5 μm) at excess loss of only 1 dB is maintained.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2015.2399922