C.F.C. Silva

Optoelectronic millimeter-wave synthesis using an optical frequency comb Generator, optically injection locked lasers, and a unitraveling-carrier photodiode

This paper demonstrates multi-octave, milliwatt-class millimeter-wave synthesis using three key components: an optical frequency comb generator, an optical injection-locking filter, and a unitraveling-carrier photodiode. The experimental system synthesizes 10-110-GHz millimeter-wave signals with 3-dBm output at 60 GHz. Phase noise results are also presented.

Terahertz span >60-channel exact frequency dense WDM source using comb generation and SG-DBR injection-locked laser filtering

Results for a simple, exact frequency synthesizer for dense wavelength-division multiplexing (WDM) are reported. Channel selection over >1-THz range with programmable channel spacing up to 25 GHz and absolute optical frequency referencing is achieved using widely tunable sampled grating distributed Bragg reflector (DBR) lasers, injection-locked to an amplified fiber loop comb generator.

Optoelectronic synthesis of milliwatt-level multi-octave millimeter-wave signals using an optical frequency comb generator and a unitraveling-carrier photodiode

Millimeter-wave signals were synthesized using an optical frequency comb generator and a unitravelling-carrier photodiode. We obtained signals from 10 to 60 GHz with a maximum power of 3 dBm at 60 GHz without the use of electrical amplification.

Exact millimetre wave frequency synthesis by injection locked laser comb line selection

Exact synthesis of millimetre-wave signals has been realised for the first time by heterodyne detection of DFB lasers locked to an optical frequency comb generator. Signals were generated in the range 10 to 40 GHz with SSB noise of -74 dBc/Hz at 100 kHz offset.

Crosstalk, noise, and stability analysis of DWDM channels generated by injection locking techniques

In this paper, theory and experimental results for wavelength-division-multiplexing (WDM) channel generation, formed by multi-line optical injection locking, is presented. A small-signal model to deal with wide-spectral-band optical injection problems has been developed. Based on this model, the crosstalk noise of an injection-locked laser in a coherent WDM system is assessed analytically. Experimental results on locking range, stability, and crosstalk noise confirms the modeling results, which indicate that stable and low-noise channels can be generated by this approach.

Exact, agile, optical frequency synthesis using an optical comb generator and optical injection phase lock loop

A novel optical source for use in agile dense wavelength division multiplexing (DWDM) networks is described. This source combines reference limited stability, wide tuning range, high spectral purity, narrow line width and fast wavelength switching.

Optical frequency synthesis for high spectral efficiency WDM transmission

In this paper an optical frequency synthesis technique using optical injection phase-locked loop is discussed. An optical frequency comb generator produces a complete set of channel frequencies is extracted from the comb spectrum using an active filtering arrangement, based on the combined use of injection locking and phase locking in an optical injection phase lock loop (OIPLL). This approach eliminates the wide bandwidth, short (<1 ns) loop propagation delay design constraints of conventional optical phase lock loops for use with non line-narrowed semiconductor lasers.

110 GHz opto-electronic frequency synthesiser using optical comb generator and uni-travelling-carrier photodiode

Using optical comb generation, SG-DBR laser comb line selection and uni-travelling-carrier photodiode, opto-electronic generation of 10 GHz to 110 GHz, -80 dBc/Hz SSB phase noise millimetre wave signals at powers up to 2 mW is demonstrated using no electrical amplification.

Exact optical frequency synthesis over >1 THz using SG-DBR lasers

Summary form only given. We report an exact optical frequency synthesis technique for WDM applications using optical injection locking of a widely tunable sampled grating (SG) DBR laser, the slave laser, to lines from a comb of optical frequencies generated by an all-fibre comb generator master laser. Unwanted lines from the comb are suppressed for locking ranges narrower than the comb frequency spacing.