Development of compact and low-crosstalk PLC-WDM filters for hybrid-integrated bidirectional optical transceivers

• Published in: Journal of lightwave technology Vol. 23; no. 5; pp. 1913 - 1917
• Main Authors: Kim, Kyoung-Youm, Yoon Kim, Se, Won Kim, Myoung, Jung, Suntae
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.05.2005; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Bidirectional; Circuit properties; Crosstalk; Design engineering; Directional coupler; Directional couplers; Electric, optical and optoelectronic circuits; Electronics; Ethernet; Exact sciences and technology; Integrated optics; Integrated optics. Optical fibers and wave guides; Noise levels; Operating temperature; Optical and optoelectronic circuits; Optical crosstalk; Optical design; optical filter; Optical filters; Optical losses; Passive filters; Passive optical networks; Polynomials; Transceivers; waveguide; wavelength-division multiplexing (WDM); Directional coupler; Integrated optics; wavelength-division multiplexing (WDM); Planar waveguide; Optical filter; Optical telecommunication; waveguides; Performance characteristic; Wavelength division multiplexing; Planar device; Transceiver
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2005.846888

This paper reports on the development of planar-lightwave-circuit wavelength-division-multiplexing (PLC-WDM) filters based on double polynomial curve directional couplers, which will be integrated into compact and low-cost bidirectional optical transceivers for FTTx systems. Silica-based PLC-WDM filters smaller than 5 mm/spl times/100 /spl mu/m for Ethernet passive optical network (E-PON) applications were designed and fabricated to have low bidirectional crosstalk (lower than -40 dB) as well as low insertion losses (lower than 1 dB) within the operating temperatures of -40 to 80/spl deg/C. Several features and design guides that can reduce the size of directional couplers and improve the level of bidirectional crosstalk are discussed.