Direct detection of optical digital transmission based on polarization shift keying modulation

Invited Article: Polarization diversity and modulation for high-speed optical communications: architectures and capacity

“…2,10 These architectures use either multiple expensive polarization beam splitters, or balanced receivers, or polarizers, or they may introduce excess loss, in the sense that some of the receiver power is thrown away. For instance, for the Creceiver in Ref.…”

Performance Analysis of Polarization Modulated DirectDetection Optical CDMA Systems over Turbulent FSO LinksModeled by the Gamma-Gamma Distribution

“…) is the conditional error probability based on the binary PolSK modulation in the presence of turbulence [17,23].…”

“…The prime code sequence signal has N chips and d k (t), c k (t) ∈ {0, 1}, where P T denotes a unity rectangular pulse of width T , and T s and T c are the symbol duration and chip duration, F = p 2 = T s /T c . By using the Jones notation [17,18], the electrical field can be represented by the vector of the Jones matrix, J = E x E y T , and two SOPs represented by J H and J Y are orthogonal if their inner product is zero [19]. In the PolSK modulation scheme, the binary bits map into the Jones vectors when the angle of one polarization component is switched relative to the other between two angles [4].…”

Advanced all-optical logic gates on a spectral bus

“…A wide-deviation frequency-shift keying method has previously been suggested to fulfill this requirement for a FWM-based device. 11 As an alternative, we propose a data modulation that is based on binary polarization shift keying 12 ͑PolSK͒, where the states of polarization ͑SOP͒ of the signal are orthogonal for 0 and 1. In a system that uses polarizationmaintaining fiber, the SOP's are adjusted to coincide with the fast and the slow transmission axes in order for the original linear SOP's to be maintained during transmission.…”