摘要:
Techniques, devices and systems for optical communications based on wavelength division multiplexing (WDM) that use tunable multi-wavelength laser transmitter modules.
摘要:
An optical modulation device includes: an optical modulator; an insulating layer; an RC circuit including a resistor and a capacitor connected in series; a bonding wire connected between the optical modulator and the RC circuit; a first metal layer provided on the insulating layer; and a second metal layer that has a width larger than that of the first metal layer and is provided on the insulating layer, the second metal layer being connected with a ground potential and being connected to the RC circuit via the first metal layer.
摘要:
A semiconductor laser has a first diffractive grating area. The first diffractive grating area has a plurality of segments. Each segment has a first area including a diffractive grating and a second area that is space area combined to the first area. Optical lengths of at least two of the second areas are different from each other. A refractive-index of each of the segments are changeable.
摘要:
Techniques, devices and systems for optical communications based on wavelength division multiplexing (WDM) that use tunable multi-wavelength laser transmitter modules.
摘要:
An optical device includes a substrate and a first optical waveguide including a mesa. The mesa includes a first lower clad layer portion, a first core layer portion, and a first upper clad layer portion. The first lower clad layer portion, the first core layer portion, and the first upper clad layer portion are disposed in this order from the substrate side. The optical device also includes a first etch stop layer configured to stop etching when the first optical waveguide is formed. The first etch stop layer being laminated over the substrate. The first optical waveguide is laminated on the first etch stop layer.
摘要:
In one embodiment, the optical transmitter is configured to generate a plurality of optical signals at a corresponding plurality of different wavelengths multiplexed onto an output waveguide. The transmitter includes a first and second converter including different first and second active materials configured to emit light at a first and a different second wavelength, respectively. Furthermore, the transmitter includes a first converter waveguide traversing the first and second material of the first and second converters. The second material is at an output end of the first converter waveguide and the first material is at an input end, upstream of the output end, of the first converter waveguide. The second active material is transparent to the light at the first wavelength and the output end of the first converter waveguide leads to the output waveguide.
摘要:
An optical semiconductor device includes: semiconductor lasers separated into two groups; an optical coupler combining light output from the semiconductor lasers; an optical amplifier amplifying light output from the optical coupler; and waveguides respectively connecting the semiconductor lasers to the optical coupler. Each of the waveguides includes a respective bent waveguide. The bent waveguides have the same radius of curvature.
摘要:
A laser source includes a laser beam generating section for generating a laser beam in a cavity between first reflector and a second reflector; and a tap section provided in the cavity to take out a part of the laser beam. The laser source is a waveguide-based laser source.
摘要:
A method to tune an emission wavelength of a wavelength tunable LD is disclosed. The wavelength tunable LD includes two regions each providing micro heaters to modify the refractive index of micro regions provided with power. The method periodically detects a difference between the emission wavelength and the target wavelength. This wavelength difference is converted into power next supplied to respective micro heaters independently.
摘要:
A semiconductor laser includes: a first reflector that is provided in a gain region and has a sampled grating in which a plurality of segments are combined; and a second reflector that is optically connected to the first reflector and has a sampled grating in which a plurality of segments are combined, the plurality of segments of the first reflector having a short-segment region and a long-segment region, the long-segment region having an optical length that is larger than that of the short-segment region and being positioned closer to the second reflector than at least one of the short-segment region, the optical length of the long-segment region being larger than that of the short-segment region in a range of integral multiple (n≧1) plus-minus 25% of the optical length of the short-segment.