By Hui, Rongqing; O'Sullivan, Maurice
This publication is an quintessential selection of key optical dimension suggestions crucial for constructing and characterizing contemporary photonic units and fiber optic structures. supplied are accomplished and systematic descriptions of assorted fiber optic dimension tools with the emphasis at the realizing of optoelectronic sign processing methodologies, assisting the reader to weigh up the professionals and cons of every strategy and identify their suitability for the duty handy.
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This e-book is an vital selection of key optical dimension strategies crucial for constructing and characterizing state-of-the-art photonic units and fiber optic platforms. supplied are accomplished and systematic descriptions of assorted fiber optic size tools with the emphasis at the realizing of optoelectronic sign processing methodologies, aiding the reader to weigh up the professionals and cons of every approach and identify their suitability for the duty to hand.
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Extra resources for Fiber Optic Measurement Techniques
A plane optical wave is projected onto the optical interface at an incident angle y1 (with respect to the surface normal). The optical wave is linearly polarized, and its field amplitude vector can be decomposed into two orthogonal components, i i and E⊥ parallel and perpendicular to the incidence plane. At the optical E== interface, part of the energy is reflected back to the same side of the interface and the other part is refracted across the interface. 2 Plane wave reflection and refraction at an optical interface.
4 can also be written as qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ À Á Àn22 cos y1 þ n1 n22 À n21 sin2 y1 qﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃ r== ¼ À 2 Á n2 À n21 sin2 y1 n22 cos y1 þ n1 ð1:3:4Þ ð1:3:5Þ where variable y2 is eliminated. Similar analysis can also find the reflectivity for optical field components perpendicular to the incident plane as r⊥ ¼ or, equivalently, r E⊥ n1 cos y1 À n2 cos y2 i ¼ n cos y þ n cos y E⊥ 1 1 2 2 qÀﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃÁ n22 À n21 sin2 y1 qÀﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃﬃÁ r⊥ ¼ n22 À n21 sin2 y1 n1 cos y1 þ n1 cos y1 À ð1:3:6Þ ð1:3:7Þ Optical Fibers 47 Power reflectivities for parallel and perpendicular field components are therefore 2 2 r i =E== ð1:3:8Þ R== ¼ r== ¼ E== and i 2 R⊥ ¼ jr⊥ j2 ¼ E⊥r =E⊥ ð1:3:9Þ Then, according to energy conservation, the power transmission coefficients can be found as 2 2 t i =E== ð1:3:10Þ T== ¼ E== ¼ 1 À r== and 2 T⊥ ¼ E⊥t =E⊥i ¼ 1 À jr⊥ j2 ð1:3:11Þ In practice, for an arbitrary incidence polarization state, the input field can always be decomposed into E== and E⊥ components.
7 for InGaAs, and x ¼ 1 for Ge avalanche photodiodes. From a practical application point of view, APD has advantages compared to conventional PIN when the received optical signal is very weak and the receiver SNR is limited by thermal noise. In quantum noise limited optical receivers, such as coherent detection receivers, APD should, in general, not be used, because it would only increase noise level and introduce extra limitations in the electrical bandwidth. 3 OPTICAL FIBERS Optical fiber is the most important component in fiber-optic communication systems as well as in many fiber-based optical measurement setups.
Fiber Optic Measurement Techniques by Hui, Rongqing; O'Sullivan, Maurice