Optical add-drop multiplexers based on the antisymmetric waveguide Bragg grating

Abstract

A novel optical add-drop multiplexer (OADM) based on a null coupler with an antisymmetric grating was designed and experimentally demonstrated. The antisymmetric grating exclusively produces a reflection with mode conversion in a two-mode waveguide. This improves the performance compared with previous demonstrations that used tilted Bragg gratings. Our design minimizes noise and cross talk produced by reflection without mode conversion. In addition, operational bandwidth and, versatility are improved while the compactness and simplicity of the null coupler OADM are maintained.

Spectral phase encoders for optical CDMA using anti-symmetric gratings

“…Applications of this novel grating in WDM optical Add/drop multiplexers produced compact and versatile OADM with excellent crosstalk properties [6]. We present novel OCDMA encoders/decoders designs based on our experimental results for the anti-symmetric grating.…”

“…The complex impulse response for encoder 1 is shown in Figure 2(b). The index modulation and code length for both schemes is 4x10-4 [5,6] and N=8 respectively.…”

Studies on passive and active silver–sodium ion-exchanged glass waveguides and devices

“…Integrated optical add-drop multiplexers (OADMs) such as those suggested in Refs. [13][14][15][16] require low birefringence not only for the fundamental (even) but also for the second order (odd) mode. This is why it is important to define the second order mode birefringence, too.…”

An Anti-Symmetric-Sample Grating Structure for Improving the Reconstruction-Equivalent-Chirp Technology

“…Also recently, the anti-symmetric waveguide grating has been proposed for mode conversion in the multimode waveguide and its application for high-efficiency integrated optical add-drop multiplexer (OADM) was also demonstrated [7], [8]. In this letter, a REC based anti-symmetric-sample (ASS) grating structure is first proposed and studied for changing the WS-CWC.…”