Design and tolerance analysis of a router with an amplified resonator and Bragg gratings

2005

J. Lightwave Technol.

Abstract-General filter architecture using co-and counterpropagation signals are studied. A specific configuration based on a Sagnac loop within a ring resonator is analyzed. Novel tuning, apart from conventional tuning, is achieved by changing the coupling ratio of a coupler through the adjustment of the equivalent loop length. Full equations describing the filter behavior in passive and active configurations, and simple closed-form formulas to compute the tuning, tolerance, and full-width at half-maximum are reported. The performance of these devices is discussed for their application as selective or channel-dropping ultra-narrowband filters. The effect of losses and their dispersion properties are also discussed. These devices can be conveniently implemented, using silicon-or InP-integrated optic technology, for they have high free spectral ranges.

Section: Coupling-ratio Tolerance Effect On Tuningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sagnac loop in ring resonators for tunable optical filters

2005

J. Lightwave Technol.

“…The output power is zero at those frequencies that make the phases in (1) an integer multiple of and simultaneously . From (4), we obtain that those frequencies are given by (7) where is the speed of light in vacuum, the effective refractive index of the fiber or waveguide, and the second term of (4), which is used as the tuning angle.…”

Section: Filter Architecture and Designmentioning

confidence: 99%

“…According to the previous requirements, different optical filters have been developed [5], [6] using as building blocks Mach-Zehnder (MZ) interferometers and recirculating delay lines with phase shifters, amplified ring resonators, and loop mirrors [2]- [4], [7]. Even compound ring resonators are reported [8] but in a slightly different configuration, and there is no use of the coupling coefficient as the tuning parameter nor a mention about it.…”

Section: Introductionmentioning

confidence: 99%

Tunable optical filters using compound ring resonators for DWDM

IEEE Photon. Technol. Lett.

et al. 2003

Abstract-The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a directional coupler. The loop mirror is implemented using a Sagnac configuration to have the same optical path between the signals to be interfered (copropagating and counterpropagating ones). The filter structure allows optical integration for having higher free-spectral ranges. Simple design equations for the filter parameters and the tuning are reported. Measurements on a passive optical fiber tunable filter are presented. There is a good agreement between measurements and theory.

“…Another interesting approach is having filter structures easily translated to an integrated optic implementation with a high level of integration. In this respect different optical filters have been developed [2,3] using as building blocks, Mach Zendher (MZ) interferometers and recirculating delay lines with phase shifters or amplified ring iresonators [4,5]. In this paper, we present a novel tunable filter, based on the structure reported in [5] but in its passive form to operate as a notch filter.…”

Section: Introductionmentioning

confidence: 99%

Measurements on passive tunable optical filters for DWDM

Proceedings of 2002 IEEE/LEOS Workshop on Fibre and Optical Passive Components (Cat.No.02EX595)

et al.

-Measurements on a passive optical fibre tunable filter are presented. The device is based on a loop mirror in a ring resonator. The loop mirror allows tuning by changing the coupling coefficient of a coupler.The novel fiter structure allows planar optical integration for having higher free spectral ranges. Novel and simple design equations for the fiter parameters and the tuning process are reported. There is a good agreement between measurements and theory.