Are you N. Hwang?

Claim your profile

Publications (8)2.12 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: To reduce the size and cost of a bidirectional optical module, a novel optical coupling technique has been developed using a new 155 Mbit/s transceiver chip. Since the chip is structured such that a pin-photodiode is monolithically integrated on a laser diode, bidirectional optical coupling is simply achieved by passively aligning an angle faceted singlemode fibre on the V-groove of a silicon optical bench. In a packaged size of 2.5×1.3mm<sup>2</sup>, an output power of -7 to -10 dBm and responsivity of 0.45±0.05 A/W can be obtained
    Electronics Letters 12/1998; · 1.04 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Quantitative evaluation of passive-aligned laser diode-to-fiber coupling is presented. From the assembly of 250 transmitter optical subassemblies, flip-chip bonding of laser chips and fiber fixing yields are reported. The coupling characteristics of passive-aligned laser diode modules are evaluated in comparison with the active alignment data and the misalignment tolerances. The assembly and coupling results have showed about 80% overall yield and 1.79 dB±1.55 dB excess coupling loss, respectively
    Electronic Components & Technology Conference, 1998. 48th IEEE; 06/1998
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we present a noble optical coupling technique for low-cost subscriber's module in terms of coupling efficiency and its stability issues. For efficient passive integration of a single mode fibre (SMF) and optical devices, silicon submounts were designed to minimize the alignment degree of freedom
    Lasers and Electro-Optics Society Annual Meeting, 1997. LEOS '97 10th Annual Meeting. Conference Proceedings., IEEE; 12/1997
  • [Show abstract] [Hide abstract]
    ABSTRACT: As optical transmission capacity increases, the application of multi-fiber array technology is becoming more popular in many areas. Tapered fiber array is used to compensate the mode-field diameter mismatch of a device resulting in high optical coupling efficiency. As the radius of a fiber tip decreases, optical coupling efficiency increases with the trade-off of optical alignment tolerance. Therefore, for higher optical coupling efficiency, more accurate alignment processes between the components and reliable assembly methods are necessary. Compared with soldering or the epoxy bonding technique, the laser welding technique is well known as a reliable fixing method for optical component packages. However, careful design of welding components for fixing tapered fiber array is required to obtain low post weld shift. In this study, the effect of laser welding processes on the optical misalignment of the arrayed fibers is investigated using semiconductor optical switch devices
    Lasers and Electro-Optics Society Annual Meeting, 1997. LEOS '97 10th Annual Meeting. Conference Proceedings., IEEE; 12/1997
  • [Show abstract] [Hide abstract]
    ABSTRACT: The packaging of semiconductor optical devices in applications which require high coupling efficiencies as well as high reliability remains a challenging area. Especially for applications to 10 Gbps optical communication systems, module design and assembly are very important in terms of electrical, optical, and mechanical stability. In this paper, we discuss the fabrication of a 10 Gbps direct intensity modulated laser diode module using proper package design and laser welding techniques for the inhomogeneous materials of Cu-W and stainless steel (SUS304L)
    Lasers and Electro-Optics Society Annual Meeting, 1996. LEOS 96., IEEE; 12/1996
  • [Show abstract] [Hide abstract]
    ABSTRACT: The purpose of this paper is to demonstrate reliability analysis of 1.3 μm InGaAsP/InP MQW-PHB laser diodes (LD) for high speed optical communication systems. We have accelerated aging tests and compared the assessment of 1.3 μm InGaAsP/InP strain-compensated MQW PBH-LD's with different numbers of quantum well (N<sub>QW</sub>) and active width (W<sub>A</sub>). The experimental results show that ΔI<sub>th</sub> is related with W<sub>A</sub> rather than with N <sub>QW</sub>. For the same W<sub>A</sub>, we have observed that the variation of N<sub>QW</sub> has less effect on ΔI<sub>th</sub> which is primarily due to the limitation of the fabrication process in controlling the uniformity and homogeneity in the MQW layer
    Electronic Components and Technology Conference, 1996. Proceedings., 46th; 07/1996
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, low PWS (post-weld shift) and large aligning tolerance DFB-LD (distributed feedback laser diode) modules and APD (avalanche photodiode) modules were obtained by combining proper package design and the development of a laser welding technique. The welded parts of the modules were analyzed in terms of laser welding parameters, cross-section analysis and shear strength tests
    Lasers and Electro-Optics Society Annual Meeting, 1995. 8th Annual Meeting Conference Proceedings, Volume 1., IEEE; 11/1995
  • [Show abstract] [Hide abstract]
    ABSTRACT: A distributed feedback (DFB) laser module has been developed for 2.5 Gbs-1 optical transmission systems. The DFB laser has a multiple-quantum-well (MQW) active layer and a planar buried heterostructure (PBH) for a low threshold current and stable singlemode operation with low chirping. A PBH DFB laser module with a single-mode fibre pigtail and an optical isolator was designed and fabricated by employing a single lens and a laser welding method. The fabricated MQW PBH DFB laser module is shown to be a suitable light source for 2.5 Gb s-1 optical transmission systems with a minimum received power of-33 dBm after 47 km conventional optical fibre transmission.
    Optical and Quantum Electronics 04/1995; 27(5):547-552. · 1.08 Impact Factor