850nm光脈衝激發次兆赫波發射器

在本論文的研究中我們展示了兩個新穎的光電發射器，一個是利用低溫成長砷化鎵(LTG-GaAs)為基材的分離式傳輸複合光二極體(STR-PD) ，另一者是以砷化鎵/砷化鋁鎵(GaAs/AlGaAs)為基材的單載子傳輸光二極體(UTC-PD)。此兩種元件結合槽孔式的單極圓碟微波天線，其具有無需要整合在Si-lens的優點。藉由中心波長為800nm超快速飛秒光脈衝光訊號的激發下，我們的光電發射器可幅射出一個強而有力的次兆赫波脈衝訊號(最大功率20mW)和一個較寬的頻帶(100GHz到250GHz)。並由兆赫波時域光譜(TDS)系統量測並轉換成頻域訊號，此頻域訊號可應用在兆赫波資料連結系統內。而當元件操作在逆偏下，此光電發射器的峰值功率（峰值電場平方）隨著外加偏壓有顯著的變化，並經由訊號歸一化分析後，我們可以清楚的看到峰值功率與外加逆偏壓呈現一線性關係，此線性現象對於我們調制光次兆赫波的傳輸資料，有很大的益助。

關鍵字

THz ；光發射器；單極圓碟天線；分離-傳輸-複合光二極體；單載子傳輸光二極體

並列摘要

In this paper, we demonstrated two novel photonic transmitters; one is composed of low-temperature-grown GaAs (LTG-GaAs) based separated-transport-recombination photodiode (STR-PD) and the other is GaAs/AlGaAs based Uni-traveling-carrier photodiode (UTC-PD). Both devices are integrated with broadband micromachined monopole antennas but without the integration with Si-lens. Under femto-second optical pulse illumination which the wavelength of around 800nm, the photonic-transmitter can radiate strong sub-THz pulses (20mW peak-power) with a wide bandwidth (100~250GHz). Such result was directly measured by a THz-TDS system, which could be used as a THz UWB data link system. The bias dependent high-peak-power performance of our device implies its application of photonic emitter and data modulator in photonic sub-THz UWB system.

並列關鍵字

photonic-transmitters ； THz

參考文獻

[1] M. Z. Win and R. A. Scholtz, “ Impulse Radio: How it works,” IEEE Commun. Lett., vol. 2, pp. 36-38, 1998.

[2] K. Humphreys, J.P. Loughran, M. Gradziel, W. Lanigan, T. Ward, J. A. Murphy, C. O''Sullivan, “Medical applications of terahertz imaging: a review of current technology and potential applications in biomedical engineering,” Proc. EMBC, vol. 1, pp. 1302 - 1305, 2004.

[3] K. Kato, “Ultrawide-Band/High-Frequency Photodetectors,” IEEE Trans. Microwave Theory Tech., vol. 47, pp. 1265-1281, Jul., 1999.

[4] J. R. Pardo, J. Cernicharo, E. Serabyn, “Atmospheric transmission at microwaves (ATM): an improved model for millimeter/submillimeter applications,” IEEE Trans. on Antennas and Propagation, vol. 49, no. 12, pp. 1683 – 1694, Dec. 2001.

[5] M. C. Gaidis, H. M. Pickett, C. D. Smith, S. C. Martin, R. P. Smith, P. H. Siegel, “A 2.5-THz receiver front end for spaceborne applications,” IEEE Trans. on Microwave Theory and Tech., vol.48, no. 4, pp. 733 – 739, Apr., 2000.

國際替代計量

850nm光脈衝激發次兆赫波發射器

未授權

主題瀏覽