Linear PD/LD module, linear PD/LED module, linear LD/PD module,

Details Linear PD/LD module, linear PD/LED module, linear LD/PD module, Linear PD/LD module, linear PD/LED module, linear LD/PD module,

Filed on

1996-11-13

Date issued

1998-07-28

Examiner

Healy, Brian

Patent Class

Optical waveguides

SubClass

With disengagable mechanical connector

SubSubClass

Optical fiber to a nonfiber optical device connector

Other Related Categories

385 24, 385 49, 385 33, 385 89, 385 93, 372 43, 372 50, 359115, 359124, G02B 636, H01S 318, H04J 1402

Type

Patent

Status

active

Patent number

057872155

Description

ABSTRACT:
WDMs have been used to separate a plurality of signals spatially by the difference of wavelengths in prior bidirectional multiwavelength optical communication network. For excluding WDMs, linear PD/LD modules adopt eigen-wavelength photodiodes sensing only the light of an eigen wavelength but allowing all the wavelengths longer than the eigen wavelength. An n-member PD/LD module aligns (n-1) eigen wavelength photodiodes, PD1, PD2, PD3, . . . , PDn-1 of .lambda.1, .lambda.2, .lambda.3, . . . ,.lambda.n-1 and an LD of .lambda. n which satisfy inequalities .lambda.1<.lambda.2<.lambda.3 <. . . <.lambda. n in series on a beam line in the order of increasing the eigen wavelengths. Otherwise, an n-member PD/LED module aligns k eigen wavelength PDs of .lambda.1, .lambda.2, .lambda.3, . . . , .lambda.k and (n-k) LEDs emitting light of different wavelengths of .lambda.k+1, .lambda.k+2, .lambda.k+3, . . . .lambda. n on the beam line in the same order. On the contrary, an n-member LD/PD module aligns a .lambda.1 laser and (n-1) eigen-wavelength photodiodes PD2, PD3, . . . , PDn of .lambda.2, .lambda.3, . . . , .lambda.n in series on a beam line ( .lambda.1<.lambda.2<.lambda.3 <. . . <.lambda.n). Otherwise, an n-member LED/PD module aligns k LEDs emitting light of different wavelengths of .lambda.1, .lambda.2, .lambda.3, . . . , .lambda.k and (n-k) eigen wavelength PDs of .lambda.k+1, .lambda.k+2, .lambda.k+3, . . . .lambda. n in series on a beamline(.lambda.1<.lambda.2<.lambda.3 <. . . <.lambda.n).

REFERENCES:
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Shishikura et al: "A wide tolerance waveguide type PIN photodiode" (A Waveguide PIN-PD with Wide Coupling Tolerance) Electronics Information Communication Society 1995, C-386(1995) and its English version.
Yamada et al: "A Hybrid Integrated Optical WDM Transmitter/Receiver Module for Optical Subscriber Systems Utilizing a Planar Lightwave Circuit Platform"., Postdeadline Papers of Optical Fiber Communication "95. PD 12-2 (1995).
Omori et l: "Optical Devices Technologies for Access Networks", 6th International Workshop On Optical Access Networks, S3.5-1 (1994).

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