Amplitude modulation produces an output signal the bandwidth of. Rp photonics encyclopedia electrooptic modulators, eom. The selection of the lower or upper sideband results in the lower sideband lsb or upper sideband usb modulation, respectively. In this study, the authors propose and mathematically characterise a novel radio over fibre downlink in which an ossb signal is generated using a singledrive, rather than. Single sideband modulation via the hilbert transform matlab. An ultrawidebandwidth singlesideband modulator for terahertz frequencies a. The bandwidth requirement can be minimized by using proper optical signal processing techniques in the system, namely optical singlesideband ssb modulation, preferably with suppressed carrier ssbsc. Optical single sideband polarization modulation for radio. Microsemi offers optical modulator driver amplifiers for 100g 200g optical transceivers used in longhaul, metro, and data center applications. By changing the radiofrequency signal that drives the modulators. Many of the mobile applications use internet access and.
An optical single sideband ossb generation method using phase modulation in semiconductor optical amplifier soa is proposed to overcome the dispersioninduced carrier suppression problem which. Some modulators can allow for transmission nearly in the full range of 0 to 100 %, while others exhibit high transmission losses or do not allow for strong. It is also possible to deal with dispersion power fading by using an optical singlesideband ossb. Macom has a large portfolio of optical modulator drivers for applications covering distances of hundreds of meters up to thousands of kilometers at data rates from 1 gbps up to 100 gbps and beyond. In radio communications, single sideband modulation ssb or single sideband suppressedcarrier modulation ssbsc is a type of modulation used to transmit information, such as an audio signal, by radio waves. Qm53a10 single sideband i q modulator 150300 mhz i q networks 150300 mhz. The latter has two signal driver ports and two bias ports up and. The ici due to the nonorthogonal transform in the fastofdm degrades system performance, and the single tap equalizer is infeasible to compensate dispersion as the multiplicationconvolution theorem cannot be applied to the transform pair. Optical vector analysis based on asymmetrical optical double. The sideband is suppressed by means of a fiber machzehnder interferometer with amplitude electrooptical. Single sideband modulation is achieved by circularly polarising the microwave field. Optical modulation with a single sideband and carrier suppressed. With this filter response, an optical single sideband suppressed carrier modulation is implemented. In radio communications, singlesideband modulation ssb or singlesideband suppressedcarrier modulation ssbsc is a type of modulation used to transmit information, such as an audio signal, by radio waves.
When choosing a modulator, keep in mind whether you need phase or amplitude modulation, broadband versus resonant or single frequency operation, and over what wavelength range you are operating. Optical singlesideband transmitter huawei technologies co. Using carriersuppressed dual singlesideband csdssb modulation, the iq modulator generates two optical sidebands that can be independently controlled in frequency, phase and power. A singlesideband modulator consisting of a pair of machzehnder modulators can generate wavelengthshifted output lightwaves. Electrooptic intensity modulator, containing a pockels cell between two polarizers. Loayssa, swept optical single sideband modulation for spectral measurement applications using stimulated brillouin scattering, opt. Sep 15, 20 ssbsc single sideband suppressed carrier basics, advantages and generation in analog communication duration.
Single sideband ssb modulation is similar to dsb modulation, but instead of using the whole spectrum it uses a filter to select either the lower or upper sideband. Photonics free fulltext irregular shifting of rf driving signal. Single sideband modulation ssb standard am and dsbsc techniques are wasteful of bandwidth because they both require transmission bandwidth of 2b hz, where b is the bandwidth of the baseband modulating signal mt. Many approaches are used to suppress undesired optical carrier such as low biasing machzehnder modulator 6, optical carrier filtering 7 and stimulated. Pdf optical single sideband signal generation using phase. Experimental demonstration of optical single sideband signal. Single side band suppressed carrier ssbsc transmission. The sideband is suppressed by means of a fiber machzehnder. But ssb demodulation information at that web site was terribly sparse. We propose and experimentally demonstrate a costeffective approach to achieve optical single sideband ossb modulation with tunable optical carrierto sideband ratio ocsr based on a bidirectional use of an ossb modulator. When choosing a modulator, keep in mind whether you need phase or amplitude modulation, broadband versus resonant or singlefrequency operation, and over what wavelength range you are operating. Optical singlesideband modulation based on siliconon.
The model h401d acoustooptic rf driver is designed to complement the h400 series rf phase modulation capable ao device family. Carriersuppressed single sideband signal for fmcw lidar using. Optical singlesideband signal generation using an optical filter with a passband having. Linbo3 and ktp are also nonhygroscopic, and have high maximum optical power limits and low optical insertion loss. Single sideband modulator with carrier has been proposed and demonstrated using a machzehnder interferometer 3,4. The simplest type of electrooptic modulator is a phase modulator containing only a pockels cell, where an electric field applied to the crystal via electrodes changes the phase delay of a laser beam sent through the crystal. A summary of the driver specification is shown in the following table. Optical vector analysis based on asymmetrical optical. We have developed an enhanced ossb modulator for wideband operation, the socalled bidirectional ossb modulator, and a simplification of this scheme. Machzehnder modulators are used to generate optical rf signal with doublesideband and carrier suppression 4. Proposed approach for driving eo phase modulators thorlabs, inc. Implementation and tuning of optical single sideband.
In both cases the transmission bandwidth b t is occupied by the upper sideband usb and lower sideband lsb. Specially designed driver circuitry is incorporated which allows flexible operation of the h400 series devices in either rf phase modulation mode or in conventional rf pulse onoff am modulation mode. And electrooptic modulator is based on a pockels cell, which acts as a phase modulator. Radiooverfiber rof has been considered as a promising delivery of multimedia services to remote base stations rbss for their huge bandwidth and low transmission loss provided by optical fibers. Typically, the output power is proportional to cos 2 c u or sin 2 c u where c is a. Figure 2 single sideband modulator schematic circuit detail is shown in figure 3. Frequency translation of single photons while preserving their quantum characteristics is an important technology for flexible networking of photonic quantum communication systems. The optical analog to the single sideband suppressedcarrier ssbsc modulator has been implemented using a fiber sagnac interferometer 1,2. Phase modulators are only offered as zcut devices because their single optical path. An optical iq modulator iqm including two parallel machzehnder modulators mzm1, mzm2 generates single sideband data signals. Pdf optical modulation with a single sideband and carrier.
These drivers offer excellent performance in compact surfacemount packages and include features such as gain control and peak detection, as well as the capability to be used in either linear or. Single sideband signal generation optical relying on a single. The modulation module integrates machzehnder dual parallel modulators, bias point control circuits, 90 degree hybrid splitter, can achieve stable and reliable single sideband modulation, and can switch between left and right sideband control as needed. It consisted of groups of telephone conversations modulated on upper andor lower sidebands of contiguous suppressed carriers. The tests show that, given suitable monitoring equipment at the t. This includes drivers for high performance machzehnder modulators, externally modulated lasers eml and directly modulated lasers dml. Ssb was used for long distance telephone communications. We investigated an optical wavelength shifter using electrooptic modulators. Mar 24, 2016 optical single sideband ossb signals are conventionally generated using a dualdrive machzehnder modulator mzm or by using a singledrive mzm in conjunction with a fibre bragg grating filter. Electro optic intensity modulator, containing a pockels cell between two polarizers. A device for modulating an optical carrier field with a single sideband signal, the device comprising.
The polarization of the input beam often has to be aligned with one of the optical axes of the crystal, so that the polarization state is not changed. Its efficiency in terms of spectrum and power when compared to other modes means that for many years it has been the most effective option to use. Understanding the phasing method of single sideband. An ultrawidebandwidth singlesideband modulator for. Descriptionthe kymu ssb 15 series product is an optical cs ssb modulation module developed by our company. This modulator is capable of shifting the frequency of a laser over a range of. Ssbsc single sideband suppressed carrier basics, advantages and generation in analog communication duration. Generation of optical carrier suppressed signal for radio. Lithium niobate electrooptic modulators, fibercoupled.
The modulation signal generated from channel 1 of an arbitrary waveform generator awg, which was then amplified to the required amplitude with a rf driver before being applied to the phase modulator. Optical singlesideband modulation based on silicononinsulator coupledresonator optical waveguides shijie song, axiaoke yi, a, suen xin chew, liwei li, alinh nguyen, and rongkun zheng b a university of sydney, faculty of engineering and information technologies, school of electrical and information engineering, building j03, sydney 2006, australia. The kymussb15 series product is an optical csssb modulation module developed by our company. Rp photonics encyclopedia intensity modulators, acousto. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently. The latter has two signal driver ports and two bias ports up and down that can be. Optical singlesideband transmitter huawei technologies. In this paper, we propose an efficient coherent optical fastofdm scheme for ssb modulation. Machzehnder modulators are used to generate optical rf signal with double sideband and carrier suppression 4. Pdf optical single sideband signal generation using. High gain and broadband gaas mmic driver amplifiers. Optical single sideband modulation with tunable optical. Here we demonstrate a flexible scheme to interface differentcolor photons using an optical single sideband ossb modulator.
Ghz opearation, and their operations are verified by measurement. By changing the radiofrequency signal that drives the modulators, we can easily shift. The sideband is suppressed by means of a fiber machzehnder interferometer with amplitude electro optical. Abbreviated as ssb, single sideband modulation is a type modulation that eliminates all components of one sideband from an amplitudemodulated wave. The phase modulation is then typically transformed into an intensity modulation by sending the light through a polarizer. This method has advantage of being independent on the mzeom bias, but it is required to center the modulators location precisely within the sagnac loop. The photline mxan optical analog modulators series are. The obtained results show that this optical single sideband filter has a good performance with dvbs standard signal. In an rof system, optical singlesideband ossb modulation is an effective technique to modulate the radio signal on an optical carrier oc since it can enhance. A tunable single sideband electrooptic modulator has been devised which uses the principle of travelling wave resonance in a microwave ring circuit.
Tunable single sideband electrooptic ring modulator. Single sideband signal generation optical relying on a. The webs wikipedia singlesideband modulation gives the mathematical details of ssb generation 1. And electro optic modulator is based on a pockels cell, which acts as a phase modulator.
Linbo3 and ktp are also nonhygroscopic, and have high maximum opticalpower limits and low optical insertion loss. In my internet searching, i found the ssb information available on the net to be either badly confusing in its notation or downright ambiguous. Aug 08, 2012 the webs wikipedia single sideband modulation gives the mathematical details of ssb generation 1. A high resolution optical vector network analyzer based on. A sideband signal is obtained by adding a sideband filter to capture the upper or lower sideband. Double sideband dsb and single sidebandssb sharlene katz james flynn 91608. Both the pdrm and the qhc are carefully designed for 30 ghz opearation, and their operations are verified by measurement. Single sideband modulation, ssb is the main modulation format used for analogue voice transmission for two way radio communication on the hf portion of the radio spectrum. Model use with center frequency output power rfa141 12024 series 40mhz 30. The optical vector network analyzer based on the proposed optical singlesideband modulation scheme. Experimental demonstration of optical single sideband. It requires no optical pumping, so that its switching time is not limited by that of the light source.
Descriptionthe kymussb15 series product is an optical csssb modulation module developed by our company. Optical singlesideband modulators and their applications. Single sideband modulated coherent optical fastofdm with. Optical modulation with a single sideband and carrier. Because of this, evaluating driver and amplifier options frequently requires calculating the power, in. The full performance and utility of modern rf sources can then be transferred to the optical signal using electrooptic modulation. A phase modulator was used to processing the light signal for optical single sideband signal generation. Optical carrier suppression causes frequency doubling 5. In this study, the authors propose and mathematically characterise a novel radio over fibre downlink in which an ossb signal is generated using a. This modulation current reflects a modulation voltage of 1. Optical single sideband ossb signals are conventionally generated using a dualdrive machzehnder modulator mzm or by using a singledrive mzm in conjunction with a fibre bragg grating filter. This modulator is capable of shifting the frequency of a laser over a range of frequencies corresponding to.
The driver accepts two independent digital and analogue modulating signals and provides a doublesideband amplitude modulated rf output to the acoustooptic modulator. A control unit 18 generates additional optical single sideband pilot signals ps1, ps2 positioned in a lower and a higher sideband respectively, and also further pilot signals ps3, ps4 in both sidebands. A single sideband suppressedcarrier ssbsc optical modulator is demonstrated. Singlesideband upconverter modulator part number lo carrier frequency rangeghz carrier suppression dbc conversion lossdb sideband suppression dbc carrier fundamental ifdbc carrier 2 if,4 if, etc dbc. Optical single sideband modulation using a semiconductor. The wavelength of the output lightwave depends on rfsignal frequency and dcbias voltage. Precise tuning of singlephoton frequency using an optical. The driver is able to deliver a modulation current of 40ma pp to 120ma pp, with an edge speed of 23ps typical 20% to 80%. Wavelength domain switching using electrooptic single. Pdf a single sideband suppressedcarrier ssbsc optical modulator is demonstrated. We can agilely control the output wavelength by changing the rfsignal frequency or dcbias voltages fed to the modulator.925 537 145 824 960 1398 105 278 22 1469 585 1045 1293 944 731 109 1364 185 921 744 1007 993 120 660 62 1483 1529 192 890 430 753 85 100 826 1382 479 23 51 1112 1179 875 951 954 693 1325