To be useful in fiber transmission applications an LED must have a high terjemahan - To be useful in fiber transmission applications an LED must have a high Bahasa Indonesia Bagaimana mengatakan

To be useful in fiber transmission a

To be useful in fiber transmission applications an LED must have a high
radiance output. a fast emission response time, and a high quantum efliciency.
its radiance (or brightness) is a measure in watts of the optical power radiated
into a unit solid angle per unit area of the emitting surface. High radianccs are
necessary to couple sufliciently high optical power levels into a fiber. as shown
in detail in Chap. 5. The emission response time is the time delay between the
application of a current pulse and the onset of optical emission. As we discuss
in Secs. 4.2.4 and 4.3.5, this time delay is the factor limiting the bandwidth with
which the source can be modulated directly by varying the injected current. The
quantum efficiency is related to the fraction of injected electron-hole pairs that
recombine radiativcly. This is defined and described in detail in Sec. 4.2.3.

To achieve a high radiance and a high quantum elficiency, the LED
structure must provide a means of confining the charge carriers and the
stimulated optical emission to the active region of the pn junction where
radiative recombination takes place. Carrier confinement is used to achieve a
high level of radiative rccornhination in the active region of the device, which
Yields a high quantum efficiency. Optical confinement is of importance for
Preventing absorption of the emitted radiation by the material surrounding the
Pn junction.
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Akan berguna dalam fiber transmisi aplikasi LED harus memiliki tinggiRadiance Keluaran. waktu respon cepat emisi, dan efliciency tinggi kuantum.radiance (atau kecerahan) adalah ukuran dalam Watt daya optis yang dipancarkanke sudut solid unit per satuan luas permukaan memancarkan. Yang radianccs tinggiperlu beberapa tingkat daya optik yang tinggi sufliciently ke fiber. seperti yang ditunjukkansecara rinci dalam Bab 5. Waktu respons emisi adalah waktu tunda Antarpenerapan denyut nadi saat ini dan timbulnya optik emisi. Selama kita membicarakandalam detik. 4.2.4 dan 4.3.5, penundaan waktu ini adalah faktor yang membatasi bandwidth denganyang sumber dapat dimodulasi langsung dengan memvariasikan arus disuntikkan. TheQuantum Efisiensi berhubungan dengan sebagian kecil dari lubang elektron disuntikkan pasangan yangrecombine radiativcly. Ini adalah defined dan dijelaskan secara rinci dalam Sec. 4.2.3.Untuk mencapai radiance tinggi dan elficiency tinggi kuantum, LEDstruktur harus menyediakan sarana confining pembawa muatan dandirangsang optik emisi ke wilayah aktif persimpangan pn manaradiasi rekombinasi berlangsung. Confinement pembawa digunakan untuk mencapaitinggi tingkat radiasi rccornhination di daerah aktif perangkat, yangMenghasilkan efficiency tinggi kuantum. Confinement optik adalah penting untukMencegah penyerapan radiasi yang dipancarkan oleh materi sekitarnyaPN junction.
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