Jesse Tuominen

Multichannel and rate all-optical clock recovery

We report on a new clock recovery scheme utilizing a birefringent fiber resonator and a polarizer that allows for parallel all-optical processing of multiple channels and rates. It is demonstrated for 21 simultaneous channels, 20 carrying data at 10 Gb/s and one at 40 Gb/s. Earlier demonstrations of multichannel operation have reported four recovered channels at only one single rate

Wavelength reference for optical telecommunications based on a temperature-tunable silicon etalon

A wavelength reference based on a temperature-tunable silicon Fabry–Perot etalon is presented. The device provides a compact and cost-effective solution for calibration of the wavelength scale from 1.3 μm to 1.7 μm. The reference is fully automated, needs a single characterization, and operates without an absolute wavelength reference. The performance of the device was estimated by comparing its fringes against acetylene absorption lines. The wavelength differences measured were found to be less than 1 pm.

Device for simultaneous monitoring of the channel wavelengths and power levels ina DWDM system

Feature Issue on Optical Performance Monitoring (OPM). A compact and cost-effective device for monitoring wavelengths and power levels of WDM channels labeled with pilot tones is presented. The device utilizes a tunable silicon etalon and a simple sampling scheme to identify and analyze the channels directly from the optical multiplex. The operation is demonstrated in a four-channel system. Extension to a large number of WDM channels is evaluated through simulations.

Switching in Liquid Crystal Filled Photonic Bandgap Fiber

This paper presents a switch based on a liquid crystal filled photonic bandgap fiber (PBF) where the signal light is transmitted in the transverse direction. A broad and smooth operational wavelength range can be obtained with this type of optical switch

Photonic bandgap fibers: optical properties and device applications

Recently emerged photonic bandgap fibers with their extraordinary optical properties offer many interesting device applications. We present the status of our work on the use of this kind of a fiber in sensing and wavelength referencing both in the 1300 and 1500 nm wavelength regions. The photonic bandgap fibers are spliced to standard single-mode fibers at input end for easy coupling and filled with gas through the other end placed in a vacuum chamber. The technique is applied to measure absorption lines of strongly absorbing gases such as acetylene and hydrogen cyanide by employing tunable lasers and LEDs as light sources. The measurement of weakly absorbing gases such as methane and ammonia is also explored. To realize a permanent wavelength reference sealing of a photonic bandgap fiber using index-matching UV-curable adhesive is demonstrated.