Good Temperature Performances of 870nm Resonant Cavity Light Emitting Diode (RCLED)
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Good Temperature Performances of 870nm Resonant Cavity Light Emitting Diode (RCLED) Lih-Wen Laih1, Yi-Hao Wu1, Li-Hong Laih2, Rong-Moo Hong1, Hao-Chung Guo3, Jung-Lung 1 Yu2, Yu-Hsiang Huang1,Yi-An Chang3, Ren-Jiun Chang1, Chun-Hui Yang , and I-Tsung Wu 1 Department of Electronic Engineering, Ching Yun University, 229, Chien-Hsin Rd., Jung-Li, TAIWAN 320, R.O.C. Phone: +886-3-4581196-5105; Fax: +886-3-4588924; E-mail: [email protected] 2 Millennium Communication Co., Ltd. No. 5-1, Kuan Fu S. Rd., Hsinchu Industrial Park, 303, Hsinchu Hsien, TAIWAN, R.O.C. 3 Institute of Electro-Optical Engineering National Chiao Tung University, 1001 Ta Hsueh Rd. Hsinchu TAIWAN 300, R.O.C. ABSTRACT A high performance of wavelength 870nm resonant cavity LED (RCLED) was fabricated. The high performance of InGaAs/GaAs multiple quantum wells (MQWs) and distributed Bragg reflector (DBR) were employed to achieve the high transmission rate. Two devices A and B were fabricated in this paper. Device A has an offset of 10nm between active region gain and resonant gain, and device B without it. Due to the wavelength shift of active region gain is faster than that of DBR’s resonant gain at higher temperature. Device A shows the better temperature performances than device B. A cutoff frequency of 60MHz, a low forward voltage of 1.6V, a output power of 1mW at 10mA and a output power temperature variation (∆P/∆T) of –0.02dBm/ ℃ with chip dimensions of 220um x 220um and 85um diameter emitting window are obtained. INTRODUCTION Many IrDAs based consumer electronic and computer products are available including mobile telephones, PCs, printers, personal digital assistants (PDAs), watches and cameras. Such products utilize low cost high speed IrDA short rang optical wireless links [1–4]. Market predictions expect a growth in IrDA enabled products from 300 million to 1.3 billion by year 2003. IrDA type optical wireless links have therefore become a major industry, used for wireless interconnection between such devices. The majority of the links to date offer data rates up to 4Mbit/s. Recently there has been a standard definition of the 16 Mbit/s data rate option, called ‘very fast infrared’ (VFIr) [5]. IrDA products comply to the well known ‘point and shoot’ usage model, with line of-sight data transfers within short range (1 m) making use of narrow optical beam e30_T:VFIr links at 16 Mbit/s enable Ethernet rate connections and fast image transfer between devices for the next few years. It is therefore expected that eventually there will be demand for even higher data rate links than those offered by VFIr. The future will eventually
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bring to the fore links of 40Mbit/s or even 100 Mbit/s data rates for high-end applications. Recent IrDA specifications [6] for the transmission of multimedia objects (such as video, pictures and music) suggest the future development of the 100 Mbit/s data rate and the implementation of high window sizes at the IrLAP layer and of small minimum turn around times at the physical layer. This article assumes t
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