摘要:
Non-reciprocal optical transmission devices and optical apparatuses including the non-reciprocal optical transmission devices are provided. A non-reciprocal optical transmission device includes an optical input portion (P10), an optical output portion (P30), and an intermediate connecting portion (P20) interposed between the optical input portion (P10) and the optical output portion (P30), and comprising optical waveguides (W10,W20). A complex refractive index of any one or any combination of the optical waveguides (W10,W20) changes between the optical input portion and the optical output portion, and a transmission direction of light through the non-reciprocal optical transmission device is controlled by a change in the complex refractive index.
摘要:
The invention relates to a method for obtaining a material (10) comprising mesogenic compounds (101) forming a liquid crystal mix with a stabilized blue phase (100), comprising the following steps: a) preparing a chemical composition comprising a mesogenic system and a chemical photo-initiator system, the mesogenic system including - said mesogenic compounds forming the liquid crystal mix, - a chiral dopant adapted to induce said blue phase, and - a monomer mix comprising monomers adapted to polymerize, and the chemical photo-initiator system being adapted to trigger the polymerization of said monomers when illuminated by a light beam of visible wavelength; b) getting said liquid crystal mix to form said blue phase; c) after getting said liquid crystal mix into said blue phase, illuminating the chemical composition obtained in step a) with a light beam of visible wavelength in order to trigger the polymerization of said monomers; d) obtaining said material comprising said liquid crystal mix in the blue phase stabilized by the polymerized monomers.
摘要:
The present invention provides an optical source comprising a laser, a first optical power splitter, phase changing equipment, polarisation state setting equipment, a polarisation beam coupler and an output. The laser is configured to generate an optical signal. The first optical power splitter is configured to split the optical signal into a first optical signal and a second optical signal. The phase changing equipment is configured to change the phase of at least one of the first optical signal and the second optical signal such that the first optical signal has a first phase and the second optical signal has a second phase different from the first phase by a preselected phase difference. The polarisation state setting equipment is configured to set the polarisation state of at least one of the first optical signal and the second optical signal such that the first optical signal has a first state of polarisation and the second optical signal has a second state of polarisation substantially orthogonal from the first state of polarisation. The polarisation beam coupler is configured to combine the first optical signal and the second optical signal into a composite optical signal comprising both the first optical signal and the second optical signal having said orthogonal states of polarisation. The output is arranged to output at least a portion of the composite optical signal.
摘要:
A high-contrast electro-optic liquid crystal camera iris (10) provides angle independent transmission for uniform gray shades. The liquid crystal iris comprises a combination of first and second liquid crystal devices (12, 14) arranged in optical series and positioned between optical polarizers (46, 48). The director field (18) of the second liquid crystal device is a mirror image of the director field (16) of the first liquid crystal device, and the first and second liquid crystal devices are placed together so that the azimuthal directions (42) of the surface-contacting directors (18c, 22c) are in parallel alignment at the adjoining or confronting surfaces of the substrates (242, 321) of the first and second liquid crystal devices. The liquid crystal iris provides, therefore, less angular variation of intermediate transmittances compared with that provided by prior art liquid crystal irises.
摘要:
[Object] To provide a polarization independent optical isolator enabling downsizing of a Faraday element and a magnet. [Solving means] The polarization independent optical isolator comprises: a pair of wedge-shaped birefringent crystal plates (1, 2) provided in an optical path; and a Faraday element (30) made of a paramagnetic body and provided in the optical path between the wedge-shaped birefringent crystal plates. The pair of wedge-shaped birefringent crystal plates have inclined light-transmitting surfaces parallel to each other and non-inclined light-transmitting surfaces parallel to each other. The non-inclined light-transmitting surfaces are disposed to face the Faraday element. The polarization independent optical isolator is characterized in that: the paramagnetic body constituting the Faraday element has such a parallelogrammic cross section that light incident-emitting surfaces of the paramagnetic body are not parallel to the non-inclined light-transmitting surfaces of the pair of wedge-shaped birefringent crystal plates; and a right-angled portion (100) of each of the wedge-shaped birefringent crystal plates and a corresponding obtuse-angled portion (31) of the Faraday element are disposed on the same side with respect to an optical path central axis.
摘要:
A wavelength converter which employs an optical fiber and has high converter efficiency. The polarization planes of a signal light and an exciting light outputted from a laser diode (LD) (103) are respectively controlled by polarization controllers (PC's) (101 and 104) and the phases of the lights are respectively modulated by phase modulators (PM's) (102 and 105) in accordance with modulation signals outputted from an oscillator (110). Then, the output lights from the PM's (102 and 105) are multiplexed by a coupler (106). After the multiplexed signal light and exciting light are amplified by an optical amplifier (EDFA) (107), they are inputted to a dispersion shift fiber (DSP) (108). After wavelength transformation (four light waves mixing (FWM)) is practiced in the DSP, an FWM light is outputted through a band-pass filter (BPF) (109).
摘要:
An optical signal processing device has a nonlinear optical medium (31) and a polarization controller (42). To the nonlinear optical medium (31), signal light (E sin ) and a first pumping light having (E p ) having a wavelength different from the signal light is input by means of a polarization beam spiltter (41). The nonlinear optical medium is connected between two ports of the polarization beam splitter so as to form a loop. The polarization controller (42) is provided at the input side of the nonlinear optical medium (31) and adjusts the pumping light so that the pumping light is split by the polarization beam splitter into two mutually orthogonal, linearly polarized components having equal powers.
摘要:
System and method for effectuating substantially uniform modulation of unpolarized light. Unpolarized light is split into two beams, each beam comprising a different orthogonal mode. The mode of one beam is changed and then the beam is modulated. The other beam is modulated and then its mode is changed. The two modulated beams are combined to form a modulated multi-mode signal.