摘要:
Provided are an athermal waveguide and a method of manufacturing the same. The athermal waveguide includes: a substrate having a protruded region; a first material layer formed on the protruded region to counteract thermal expansion; and a second material layer formed on the first material layer a position corresponding to the protruded region and formed of a same base material as the protruded region.
摘要:
A dispersive optical device comprises an input optical coupler (20''); an input waveguide (10'') arranged to launch light into the input optical coupler at a launching position with respect to the input optical coupler; an output optical coupler; one or more output waveguides arranged to receive light from the output optical coupler; and a plurality of transmission waveguides (30'') arranged to receive light from the input optical coupler and direct it to the output optical coupler, the transmission waveguides generally converging towards the input optical coupler so that optical paths through the input optical coupler, which follow the axes of the transmission waveguides at their interface with the input optical coupler, intersect at an intersection point; in which the launching point is displaced from the intersection point in the direction of the axes of the input waveguide.
摘要:
The invention concerns a photonic device comprising a first section including a material adapted to interact with photons, a second section including a material adapted to interact with photons, with an area of said first section and an area of said second section abutting each other wherein at least a part of said first area and a part of said second area defines a low temperature bonding area to provide adaptability for a plurality of applications based on a combination of materials having specific characteristic benefits, however without introducing unwanted effects having a negative influence on the quality of optical signals.
摘要:
The invention pertains to a polymeric phased array comprising an input coupler with N inputs and an output coupler with M outputs, N and M being natural numbers greater than or equal to 1, wherein the couplers are optically connected by means of an optical array comprising a series of optical waveguides, each of which differs from its nearest neighbour in optical path length by a predetermined fixed amount, wherein the physical length of all the waveguides is substantially equal. The said phased arrays are less sensitive to changes in temperature and physical ageing.
摘要:
In a lightwaveguide circuit including a plurality of waveguides having different length, a material (10) having a temperature coefficient of a refractive index including a symbol different from that of a temperature coefficient of an effective refractive index of the waveguide (4) is charged into a groove (12) formed by removing the upper clad and the core from the waveguide (4), or a groove (12) formed by removing the upper clad, the core and the lower clad from the waveguide (4). A difference in length of the removed portions between adjacent waveguides is proportional to a difference in length of the waveguides which were not removed and remained.
摘要:
The present invention discloses a novel technique for reducing the temperature-related spectrum shifts in optical devices, particularly waveguide grating routers. In general, the present invention modifies a portion of the length of at least one waveguide within an optical device in a manner that stabilizes the wavelength spectrum passing therethough even when exposed to temperature variations. More specifically, by knowing how the refractive index of a certain material changes with temperature variations as compared to that of common waveguide materials, such as silica, one may employ the teachings of the present invention to precisely modify the nature of the optical path through which a signal travels to fully compensate for any temperature-related wavelength spectrum shift. As shown, a portion of both cladding (16) as well as core material (14) has been replaced with elastomeric material (20). Furthermore, an additional step may be included whereby the portion of the elastomeric material (20) adjacent the upper cladding (16) is etched away and replaced with more cladding material.
摘要:
An optical transmitter comprises a monolithic transmitter photonic integrated circuit (TxPIC) chip that includes an array of modulated sources formed on the PIC chip and having different operating wavelengths approximating a standardized wavelength grid and providing signal outputs of different wavelengths. A wavelength selective combiner is formed on the PIC chip having a wavelength grid passband response approximating the wavelength grid of the standardized wavelength grid. The signal outputs of the modulated sources optically coupled to inputs of the wavelength selective combiner to produce a combined signal output from the combiner. A first wavelength tuning element coupled to each of the modulated sources and a second wavelength tuning element coupled to the wavelength selective combiner. A wavelength monitoring unit is coupled to the wavelength selective combiner to sample the combined signal output. A wavelength control system coupled to the first and second wavelength tuning elements and to said wavelength monitoring unit to receive the sampled combined signal output. The wavelength control system adjusts the respective wavelengths of operation of the modulated sources to approximate or to be chirped to the standardized wavelength grid and for adjusting the optical combiner wavelength grid passband response to approximate the standardized wavelength grid.