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ABSTRACT: We have developed fully non-blocking optical matrix switches using a thermo-optic polymer 1 × 2 total-internal-reflection (TIR) switch as a unit switching element. The TIR switch consists of crossed multimode polymer waveguides and an offset heater electrode at the switching node. The fabricated 4 × 4 and 8 × 8 optical matrix switch chips show excellent switching performances. The insertion losses are less than 2.5 and 4.5 dB for the 4 × 4 and 8 × 8 matrix switches, respectively, and their switching isolations during a turned-off state are higher than 38 dB. The switching time is about 3 ms, and the power consumption for each switching element is below 30 mW. Compact integration of the 4 × 4 and 8 × 8 switch chips is achieved at sizes of 25 mm × 4.25 mm, and 42.4 mm × 5 mm, respectively, through an optimization of the waveguide and heater geometries.
Optics Express 06/2012; 20(12):13284-95. · 3.59 Impact Factor
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ABSTRACT: We present a 10-channel polymer thermo-optic digital optical switch (DOS) array with very low optical crosstalk. The 10-channel DOS array has a crosstalk-improved structure in which radiation-type attenuators are integrated in a series with a conventional 1 times 2 DOS. It is fabricated using a quartz substrate on which grid patterns for dispersion of stray light are formed to reduce the optical crosstalk. The measured crosstalk values are as low as -45 dB at a low electrical power of 50 mW. Insertion losses of less than 1.35 dB are achieved for all channels.
IEEE Photonics Technology Letters 11/2009; · 2.19 Impact Factor
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ABSTRACT: We have fabricated modules of 8-channel multi-wavelength lasers (MWLs) with a wavelength separation of 200 GHz for the wavelength division multiplexed-passive optical network (WDM-PON) optical line terminal sources. The variation in the output power is minimized by inserting silicone between the superluminescent diode (SLD) and the silica waveguide. The wavelength shift of each channel is less than 0.21 nm from the ITU grid and can be controlled in the range of 0.36 nm without any reductions of the output power by a tuning heater. MWLs operated successfully in the direct modulation for 1.25 Gbit/s transmissions over 20 km.
Optics Express 06/2009; 17(11):9401-7. · 3.59 Impact Factor
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ABSTRACT: A 10 channel polymer variable optical attenuator array (VOA), which is used for power monitoring and equalization in integrated planar lightwave circuit (iPLC) reconfigurable optical add-drop multiplexer (ROADM) module, is demonstrated. Maximum attenuation of about -41 dB was achieved at very low electrical power of 17 mW and insertion loss was within 0.7~0.9 dB for all channels. Polarization dependent loss for 20 dB attenuation was below 0.5 dB, and adjacent channel crosstalk was less than -40 dB.
Photonics in Switching, 2008. PS 2008. International Conference on; 09/2008
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ABSTRACT: We propose and demonstrate very compact multiwavelength lasers (MWLs) with a novel configuration designed to remove the mode hopping in the modulation region and separate the wavelength-tuning of each channel for cost-effective optical line termination sources in the wavelength-division-multiplexing passive optical network. The mode hopping of MWLs in the modulation region was eliminated by wavelength trimming using a tuning heater. The MWLs operated successfully in direct modulation for 1.25-Gb/s transmission over 20 km.
IEEE Photonics Technology Letters 04/2008; · 2.19 Impact Factor
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ABSTRACT: We successfully fabricated a very compact 8-channel 200 GHz-spacing multi-wavelength laser (MWL) module for WDM-PON OLT source. The wavelength shift of MWL from ITU grid was within - 0.25nm for the 8- channels, which was well matched to target wavelength shift of less than 0.2nm. This module operates successfully with a total throughput of 1.25 Gbit/s over 20 Km transmission.
Optical Communication (ECOC), 2007 33rd European Conference and Ehxibition of; 10/2007
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ABSTRACT: This paper introduces optical devices for G-bit WDM- PON system. We have developed WDM-PON ONU employing the reflective semiconductor optical amplifier(R-SOA) and 16 ch WDM-PON OLT which is fabricated by the hybrid integration technology.
Optical Internet, 2007 and the 2007 32nd Australian Conference on Optical Fibre Technology. COIN-ACOFT 2007. Joint International Conference on; 07/2007
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ABSTRACT: A very compact 16-channel 200 GHz-spacing transmitter module was fabricated for wavelength division multiplexing-passive optical network (WDM-PON) optical line termination (OLT) source. The transmitters are composed of reflection gratings and hybrid integrated superluminescent laser diodes (SLD) to construct 16-channel external cavity lasers (ECLs) on the planar lightwave circuit (PLC) chip.
Optical Internet and Next Generation Network, 2006. COIN-NGNCON 2006. The Joint International Conference on; 08/2006
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ABSTRACT: This paper proposes a WDM-PON system employing the reflective semiconductor optical amplifier (R-SOA) which is injected by the external cavity laser fabricated by the hybrid integration technology. The transmission performance was measured for 1.25 Gbps.
Optical Communication, 2005. ECOC 2005. 31st European Conference on; 10/2005
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Su Hwan Oh, Jang-Uk Shin,
Sang-Ho Park,
Yoon-Jung Park,
Young-Tak Han,
Duk-Jun Kim,
Sahnggi Park,
Sung-Bock Kim,
Hee-Kyung Sung,
Yong-Soon Baek,
Kwang-Ryong Oh,
Cheol-Hee Park,
Wol-Yon Hwang
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ABSTRACT: We successfully fabricated a very compact 16-channel 200 GHz-spacing transmitter module for WDM-PON OLT source. The transmitters are composed of reflection gratings and hybridly integrated reflective SOAs (RSOAs) to construct 16-channel external cavity lasers(ECLs) on the PLC chip. This module operates successfully with a total throughput of 1.25 Gbit/s over 20 km transmission.
Optical Communication, 2005. ECOC 2005. 31st European Conference on; 10/2005
