Photonic Integrator for A/D Conversion

YIYE JIN; PABLO A. COSTANZO CASO; SERGIO GRANIERI; AZAD SIAHMAKOUN

SPIE

SPIE

Año: 2010 p. 1 - 8

0277-786X

<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-1610611985 1107304683 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast;} p.SPIEabstractbodytext, li.SPIEabstractbodytext, div.SPIEabstractbodytext {mso-style-name:"SPIE abstract body text"; mso-style-unhide:no; mso-style-link:"SPIE abstract body text Char Char"; margin-top:0cm; margin-right:0cm; margin-bottom:6.0pt; margin-left:0cm; text-align:justify; text-justify:inter-ideograph; mso-pagination:widow-orphan; font-size:10.0pt; mso-bidi-font-size:12.0pt; font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast;} span.SPIEabstractbodytextCharChar {mso-style-name:"SPIE abstract body text Char Char"; mso-style-unhide:no; mso-style-locked:yes; mso-style-link:"SPIE abstract body text"; mso-bidi-font-size:12.0pt; mso-fareast-language:EN-US;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-fareast-language:ZH-CN;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> This paper presents a novel optical leaky integrator for an all-optical A/D converter based-on sigma-delta modulation. The device consists of two main components: a fiber ring resonator (FRR) and a wavelength converter. The FRR comprises a SOA and an optical filter that defines the resonance wavelength l2. The modulated input signal, at wavelength l1, changes the gain of the loop through cross-gain modulation (XGM) and thus modifies the loop accumulation. A theoretical model for the system is developed that accounts for critical design parameters such as the loop coupling ratio, length, and XGM in the SOA. The system is characterized for square input signals ranging 0.5-5MHz. The integrator time constant is adjusted between 5% and 25% of the input signal period through modifications in the loop coupling ratio and the SOA driving-current. Experimental results show excellent agreements with the numerical simulations. Due to the length of the fiber-loop, the operation frequency of the integrator is limited to the MHz range. However, the operating frequency can be increased up to hundreds of MHz by shrinking the components’ optical fibers, or up to GHz range, by using current photonic integration technologies.