Below are the answers key for the Multiple Choice Questions in Fiber Optics Communications – MCQs Part 5.

201. red

202. refractive index

203. incident angle

204. angle of refraction

205. Gallium arsenide** **

206. 4.57 dB

207. 33.47 degrees

208. critical angle

209. the lower the speed of light

210. Acceptance cone half-angle

211. numerical aperture

212. The amount of external light the fiber will accept is greater.

213. Single mode

214. Multimode

215. the source, the link and the detector

216. more than 700 nm

217. 372

218. index profile

219. step-index

220. graded index

221. power loss

222. reflection

223. absorption loss

224. ultraviolet absorption

225. infrared absorption

226. ion resonance absorption

227. single-mode step-index

228. -35 dBm

229. wavelength dispersion

230. using a monochromatic light source

231. Microbending

232. constant-radius bending

233. 0.5 dB

234. modal dispersion

235. Use a single-mode fiber

236. Bandwidth Distance Product

237. 2 GHz

238. 20 Mbps and 10 Mbps

239. 30 to 50 nm

240. 1 nm to 3 nm

241. detector sensitivity

242. LED

243. single-mode step-index

244. Responsivity

245. dark current

246. transit time

247. spectral response** **

248. the ratio of the diode output current to the input optical power

249. light sensitivity

250. gas lasers

### Online Questions and Answers Series

Following is the list of practice exam test questions in this brand new series:

**Optical Fiber Communications MCQs**

**MCQs from Number 1 – 50**Answer key:

**PART I**

**MCQs from Number 51 – 100**Answer key:

**PART II**

**MCQs from Number 101 – 150**Answer key:

**PART III**

**MCQs from Number 151 – 200**Answer key:

**PART IV**

**MCQs from Number 201 – 250**Answer key:

**PART V**

**MCQs from Number 251 – 300**Answer key:

**PART VI**