Wide-Tuning-Wavelength-Range LGLC Laser with Low-Loss Dual-Core Spot Size Converter

Takanori SUZUKI
Hideo ARIMOTO
Takeshi KITATANI
Aki TAKEI
Takafumi TANIGUCHI
Kazunori SHINODA
Shigehisa TANAKA
Shinji TSUJI
Tatemi IDO
Jun IGRASHI
Atsushi NAKAMURA
Kazuhiko NAOE
Kenji UCHIDA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E95-C    No.7    pp.1272-1275
Publication Date: 2012/07/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E95.C.1272
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: 
Keyword: 
semiconductor lasers,  laser tuning,  optical filter,  

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Summary: 
A dual-core spot size converter (DC-SSC) is integrated with a lateral grating assisted lateral co-directional coupler (LGLC) tunable laser by using no additional complicated fabrication processes. The excess loss due to the DC-SSC is only 0.5 dB, and narrow full width half maximums (FWHMs) of vertical and horizontal far-field patterns (FFPs) produced by the laser are about 25° and 20°. This integration causes no degradations of the performance of the LGLC laser; in other words, it maintains good lasing characteristics, namely, wide tuning range of over 68 nm and SMSR of over 35 dB in the C-band under a 50 semi-cooled condition.