A wavelength-division multiplexing (WDM) optical assembly with increased lane density is disclosed herein. The WDM optical assembly includes a WDM optical core subassembly including an optical signal router for routing an optical signal between a first side and a second side of a substrate. The WDM optical core subassembly further includes a first WDM filter having a first passband and a second WDM filter having a second passband. The WDM optical core subassembly forms a first optical path between a first common port, the first WDM filter, and a first channel port, and to form a second optical path between the second WDM filter, a second common port, and a second channel port. The WDM optical core subassembly increases lane density while decreasing size and complexity by including a plurality of common ports in optical communication with the same plurality of WDM filters.

The present invention provides a multichannel parallel light emitting device comprising a semiconductor cooler, a cold surface of the semiconductor cooler completely covers the area of a hot surface, and when the hot surface and the cold surface are horizontally disposed, a horizontal distance is reserved between the edge of the cold surface and the edge of the hot surface, and a positive electrode and a negative electrode are fixed on a second surface of the cold surface. The semiconductor cooler with the above structure is disposed in a sealed BOX of a BOX package, the bottom surface of the inner wall of the BOX package is provided with a groove for mounting a semiconductor cooler, a hot surface of the semiconductor cooler is fixed at the bottom of the groove, an insulating low thermal conductivity sealing ring is disposed between a lower end of a cold surface of the semiconductor cooler and the BOX package, so that the BOX package, the insulating low thermal conductivity sealing ring and the cold surface of the semiconductor cooler form a closed space, so as to achieve the TEC local hermetic effect, a water-proof film is not required for the TEC, and to ensure the TEC can work in a non-hermetic environment.

Method and multiport free-space wavelength division multiplexing (WDM) device capable of handling multiple optical signals carried in multiple wavelengths (.sub.n) using a relay lens are disclosed. The WDM device includes an optical filter, collimator, optical relay, and a relay optical filter. The optical filter is able to receive an optical beam containing multiple .sub.n and subsequently extract a first wavelength (.sub.1) from .sub.n. A second optical beam is formed by the remaining of .sub.n. The collimator, in one example, receives .sub.1 from the optical filter. Upon receiving the second optical beam, the optical relay collimates the second optical beam with minimal loss due to light divergence. The relay optical filter, in one aspect, is configured to receive the collimated second optical beam and redirects the collimated second optical beam to a predefined intended orientation.

The disclosed flow cytometer includes a wavelength division multiplexer (WDM). The WDM includes an extended light source providing light that forms an object, a collimating optical element that captures light from the extended light source and projects a magnified image of the object as a first light beam, and a first focusing optical element configured to focus the first light beam to a size smaller than the object of the extended light source to a first semiconductor detector. The disclosed flow cytometer further includes a composite microscope objective to direct light emitted by a particle in a flow channel in a viewing zone of the composite microscope to the extended light source, a fluidic system and a peristaltic pump configured to supply liquid sheath and liquid sample to the flow channel, and a laser diode system to illuminate the particle in the flow channel.

An optical transmitter including first, second, third and fourth signal generators configured to transmit first, second, third and fourth optical signals, a first filter configured to combine the first optical signal with the second optical signal to form a first multi-channel signal, a second filter configured to combine the third optical signal with the first multi-channel signal to form a second multi-channel signal, and a third filter configured to combine the fourth optical signal with the second multi-channel signal to form a third multi-channel signal. The first optical signal and the third optical signal have parallel optical axes, as do the second optical signal and the fourth optical signal. The second and fourth optical signals are at an angle of from 5? to 40? with respect to the first and third optical signals and are generally propagated in an opposite direction from the first and third optical signals.

Mode field adapters and methods of making mode field adapters that include a plurality of ports each having a collimating lens. At least one port is configured to receive a hollow core optical fiber and has a collimating lens with characteristics optimized for hollow core optical fibers. One or more other ports are configured to receive solid core optical fibers and have collimating lenses with characteristics optimized for solid-core fibers. The focal lengths of the lenses are selected so that the ratio of focal lengths between collimating lenses for hollow core and solid core optical fibers is the substantially the same as the ratio between the mode field diameters of the hollow core and solid core optical fibers. Mode field adapters may include one or more bandpass filters configured to selectively couple portions of an optical beam between a common port and different channel ports of the mode field adapter.

An optical receiver module includes: a lens array including a plurality of condenser lenses arranged in one direction to define a plane with optical axes in parallel to each other; and a light receiving element array including a plurality of light receiving elements each configured to receive light emitted from each of the condenser lenses. The light receiving element array includes: a semiconductor substrate to which the light from each of the condenser lenses is input and through which the light is transmitted; and light receiving portions each configured to receive the light transmitted through the semiconductor substrate and convert the light into an electrical signal. A shift of the optical axis of each of the condenser lenses from a center of each corresponding one of the light receiving portions is larger in a direction perpendicular to the one direction within the plane than in the one direction.

The disclosed flow cytometer includes a wavelength division multiplexer (WDM). The WDM includes an extended light source providing light that forms an object, a collimating optical element that captures light from the extended light source and projects a magnified image of the object as a first light beam, and a first focusing optical element configured to focus the first light beam to a size smaller than the object of the extended light source to a first semiconductor detector. The disclosed flow cytometer further includes a composite microscope objective to direct light emitted by a particle in a flow channel in a viewing zone of the composite microscope to the extended light source, a fluidic system and a peristaltic pump configured to supply liquid sheath and liquid sample to the flow channel, and a laser diode system to illuminate the particle in the flow channel.

Examples herein relate to a Wavelength Division Multiplexing (WDM) optical module configured for M optical fibers, N WDM wavelengths and MN optical signals. The module comprises an active silicon interposer, the interposer comprises a (M/2)N array of photodetectors established on a front side of the interposer and N chips for the N WDM wavelengths. Each chip comprises M lenses for M optical signals, the M lenses established on a back side of a GaAs substrate, the M lenses comprising a first group of M/2 lenses to focus M/2 optical input signals onto M/2 photodetectors of the (M/2)N array, and a second group of M/2 lenses to collimate M/2 optical output signals, and M/2 Vertical Cavity Surface Emitting Lasers (VCSELs) established on a front side of the GaAs substrate to generate the M/2 optical output signals.

Examples include generating a signal using a modulatable source. The signal may be propagated using a multi-mode fiber to receive the signal from the modulatable source. The fiber has a diameter d and a far-field divergence angle associated with the propagated signal that corresponds to a product of the diameter (d) and the far-field divergence angle. The product may be substantially between 1 micron radian and 4 micron radian. In some examples, the propagated signal may be received at a receiver from the multi-mode fiber.