Optical Frequency Comb

An optical frequency comb (OFC) is a special type of laser source that produces a spectrum consisting of a series of equally spaced, discrete optical frequencies — resembling the evenly spaced teeth of a comb when viewed on an optical spectrum analyzer… Read more

Wavelength Shift Keying

Wavelength Shift Keying (WSK) is a digital optical modulation technique in which information is transmitted by switching the optical carrier between two or more discrete wavelengths… Read more

Differential Phase Shift Keying

Differential Phase-Shift Keying (DPSK) is a phase modulation technique used in optical communication systems where information is carried in the phase difference between consecutive optical pulses rather than in the absolute phase of the carrier… Read more

Differential Quadrature Phase Shift Keying

Differential Quadrature Phase-Shift Keying (DQPSK) is an advanced optical modulation format in which information is encoded in the phase difference between consecutive optical symbols, with four possible phase shifts. Unlike Differential Phase-Shift Keying (DPSK), which transmits 1 bit per symbol, DQPSK transmits 2 bits per symbol, effectively doubling the data capacity without requiring extra bandwidth… Read more

Single Laser based WSK

Generally, two different laser sources are required to generate a WSK signal. In the Optisystem design implemented here, a single laser source based WSK is implemented… Read more

Combination of DQPSK and PAM2

A single laser source based free space optical link for transmission of bidirectional data of three different channels between modular data centers, where each channel has a data rate of 20 Gbps. The downlink channels are transmitted using a combination of differential quadrature phase shift keying (DQPSK)and pulse amplitude modulation (PAM). The uplink channels are transmitted using On-Off keying (OOK)… Read more

Pulse Position Modulation

Optical Pulse Position Modulation (PPM) is a digital modulation technique where information is encoded in the temporal position of an optical pulse within a predefined time frame (or slot). Instead of varying amplitude, phase, or frequency, PPM conveys data by shifting the pulse location in time… Read more

Optical Delay Line-Based UWB Monopulse Signal Generation

Ultra-Wideband (UWB) monopulse signals are short-duration pulses with very large bandwidth, used in high-speed wireless communications, radar, and positioning systems… Read more

Optical Single Sideband Suppressed Carrier Modulation

Optical Single Sideband Suppressed Carrier (SSB-SC) modulation is a modulation technique in which an optical carrier is suppressed, and only a single sideband (either the upper or the lower) of the modulated spectrum is transmitted… Read more

Direct Modulation

Direct modulation is a technique in optical communication where the drive current of a laser diode is directly varied to encode information onto the optical carrier. In this approach, the electrical data signal modulates the intensity (and indirectly, other characteristics) of the emitted light without requiring an external modulator… Read more

All-Optical Regenerate and Forward Technique

A regeneration technique for employment at the relay node that is located between the transmitter and receiver in a FSO link. A OOK signal at a data rate of 6 Gbps is transmitted over the relay-assisted FSO link under turbulence… Read more

Photonics based wideband radio frequency measurement

Photonic signal processing is a suitable alternative of electronics based processing for wideband frequency detection. The simulation design discussed here is for the detection of a wide range of frequencies based on photonic signal processing… Read more