Wavelength Tuning Free Transceiver Module in OLT Downstream Multicasting <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.2811995pt" id="M1" height="13.056pt" version="1.1" viewBox="-0.0657574 -12.7748 18.6566 13.056" width="18.6566pt"><g transform="matrix(.018,0,0,-0.018,0,0)"><path id="g113-53" d="M456 178V225H360V632H320C217 496 115 347 20 206V178H280V106C280 40 276 34 189 27V0H445V27C364 34 360 39 360 106V178H456ZM280 225H82C149 335 214 431 278 520H280V225Z"/></g><g transform="matrix(.018,0,0,-0.018,8.584,0)"><path id="g113-233" d="M529 97L508 118C475 75 449 58 438 58C428 58 421 66 415 104C393 234 374 403 364 496C345 670 307 712 254 712C220 712 174 691 153 669L161 645C176 653 194 658 206 658C237 658 261 640 278 562C287 522 290 483 293 434C223 269 110 105 23 9L32 -12C59 -6 85 0 108 7C152 64 251 252 300 366C307 297 315 221 337 82C346 24 363 -12 393 -12C425 -12 475 13 529 97Z"/></g></svg> <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.4786501pt" id="M2" height="10.1121pt" version="1.1" viewBox="-0.0657574 -9.63345 10.6686 10.1121" width="10.6686pt"><g transform="matrix(.018,0,0,-0.018,0,0)"><path id="g117-42" d="M528 54L331 254L528 455L492 493L294 291L96 493L60 455L257 254L60 54L96 16L294 217L492 16L528 54Z"/></g></svg> <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.2811003pt" id="M3" height="11.7635pt" version="1.1" viewBox="-0.0657574 -11.4824 17.3641 11.7635" width="17.3641pt"><g transform="matrix(.018,0,0,-0.018,0,0)"><path id="g113-50" d="M384 0V27C293 34 287 42 287 114V635C232 613 172 594 109 583V559L157 557C201 555 205 550 205 499V114C205 42 199 34 109 27V0H384Z"/></g><g transform="matrix(.018,0,0,-0.018,8.584,0)"><path id="g113-49" d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z"/></g></svg> Gb/s TWDM-PON System

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="483249.fig.007a" src="https://static.hindawi.com/articles/jcnc/volume-2014/483249/figures/483249.fig.007a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Four CW probes and OLT downstream spectrum</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="483249.fig.007b" src="https://static.hindawi.com/articles/jcnc/volume-2014/483249/figures/483249.fig.007b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>All 4 CW probes downstream spectrum</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="483249.fig.007c" src="https://static.hindawi.com/articles/jcnc/volume-2014/483249/figures/483249.fig.007c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Channel 1 (1545.32)—OLT TX and ONU Rx signal</td></tr></table></td></tr><tr class="fig-image" id="d"><td><img alt="483249.fig.007d" src="https://static.hindawi.com/articles/jcnc/volume-2014/483249/figures/483249.fig.007d.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(d) </b>Channel 1 spectrum at each point</td></tr></table></td></tr></table>

<table>Optical spectrum signal of downstream signal for 4 multicasting channels with 30 dB link loss margin.</table>

Journal of Computer Networks and Communications

fig7

Figure 7

Figure 7: Wavelength Tuning Free Transceiver Module in OLT Downstream Multicasting <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.2811995pt" id="M1" height="13.056pt" version="1.1" viewBox="-0.0657574 -12.7748 18.6566 13.056" width="18.6566pt"><g transform="matrix(.018,0,0,-0.018,0,0)"><path id="g113-53" d="M456 178V225H360V632H320C217 496 115 347 20 206V178H280V106C280 40 276 34 189 27V0H445V27C364 34 360 39 360 106V178H456ZM280 225H82C149 335 214 431 278 520H280V225Z"/></g><g transform="matrix(.018,0,0,-0.018,8.584,0)"><path id="g113-233" d="M529 97L508 118C475 75 449 58 438 58C428 58 421 66 415 104C393 234 374 403 364 496C345 670 307 712 254 712C220 712 174 691 153 669L161 645C176 653 194 658 206 658C237 658 261 640 278 562C287 522 290 483 293 434C223 269 110 105 23 9L32 -12C59 -6 85 0 108 7C152 64 251 252 300 366C307 297 315 221 337 82C346 24 363 -12 393 -12C425 -12 475 13 529 97Z"/></g></svg> <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.4786501pt" id="M2" height="10.1121pt" version="1.1" viewBox="-0.0657574 -9.63345 10.6686 10.1121" width="10.6686pt"><g transform="matrix(.018,0,0,-0.018,0,0)"><path id="g117-42" d="M528 54L331 254L528 455L492 493L294 291L96 493L60 455L257 254L60 54L96 16L294 217L492 16L528 54Z"/></g></svg> <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-0.2811003pt" id="M3" height="11.7635pt" version="1.1" viewBox="-0.0657574 -11.4824 17.3641 11.7635" width="17.3641pt"><g transform="matrix(.018,0,0,-0.018,0,0)"><path id="g113-50" d="M384 0V27C293 34 287 42 287 114V635C232 613 172 594 109 583V559L157 557C201 555 205 550 205 499V114C205 42 199 34 109 27V0H384Z"/></g><g transform="matrix(.018,0,0,-0.018,8.584,0)"><path id="g113-49" d="M241 635C89 635 35 457 35 312C35 153 89 -12 240 -12C390 -12 443 166 443 312C443 466 390 635 241 635ZM238 602C329 602 354 454 354 312C354 172 330 22 240 22C152 22 124 173 124 313S148 602 238 602Z"/></g></svg> Gb/s TWDM-PON System 

Journal of Computer Networks and Communications

Wavelength Tuning Free Transceiver Module in OLT Downstream Multicasting Gb/s TWDM-PON System

Figure 7