Optical spot array pitch compressor

摘要

An apparatus comprises a passive wavelength division multiplexing (WDM) demultiplexer (DeMUX) or a passive WDM multiplexer (MUX), an active photo diode (PD) array or an active laser diode (LD) array, and a compressing device disposed between the passive WDM DeMUX or the passive WDM MUX and the active PD array or the active LD array. The compressing device changes the optical spot pitch of the passive WDM DeMUX or the passive WDM MUX to match the pitch of the active PD array or the active LD array. The compressing device may be a single optical wedge, a first and a second optical wedges, a plurality of optical wedges, or a grating. A compression ratio can be adjusted by changing the incident angle of the incident beam to the compressing device.

主权项

1. An apparatus comprising:
one of a passive wavelength division multiplexing (WDM) demultiplexer (DeMUX) and a passive WDM multiplexer (MUX); one of an active photo diode (PD) array and an active laser diode (LD) array; a compressing device disposed between said one of a passive WDM DeMUX and a passive WDM MUX and said one of an active PD array and an active LD array; wherein the compressing device changes an optical spot pitch of said one of a passive WDM DeMUX and a passive WDM MUX to match a pitch of said one of an active PD array and an active LD array; and wherein a compression ratio can be adjusted by changing an incident angle of an incident beam to the compressing device; wherein the compressing device is a single optical wedge; and wherein the compression ratio can be adjusted by changing the incident angle of the incident beam to the single optical wedge according to equation:η=cos⁡[α-sin-1⁡(sin⁢⁢βn)]cos⁡[sin-1⁡(sin⁢⁢βn)]×cos⁢⁢βcos⁢{sin-1⁡[n⁢⁢sin⁡(α-sin-1⁡(sin⁢⁢βn))]}, where η is the compression ratio, β is the incident angle, α is an apex angle of the single optical wedge, and n is a refractive index of the single optical wedge.